Laparoscopic versus open total mesorectal excision for rectal cancer

Short-term results in a population based study indicate advantage for minimally invasive rectal cancer surgery versus open

BACKGROUND

The aim of this study was to determine if minimally invasive surgery (MIS) for rectal cancer is non-inferior to open surgery (OPEN) regarding adequacy of cancer resection in a population based setting.

METHODS

All 9,464 patients diagnosed with rectal cancer 2012-2018 who underwent curative surgery were included from the Swedish Colorectal Cancer Registry.

PRIMARY OUTCOMES

Positive circumferential resection margin (CRM < 1 mm) and positive resection margin (R1). Non-inferiority margins used were 2.4% and 4%.

SECONDARY OUTCOMES

30- and 90-day mortality, clinical anastomotic leak, re-operation < 30 days, 30- and 90-day re-admission, length of stay (LOS), distal resection margin < 1 mm and < 12 resected lymph nodes. Analyses were performed by intention-to-treat using unweighted and weighted multiple regression analyses.

RESULTS

The CRM was positive in 3.8% of the MIS group and 5.4% of the OPEN group, risk difference -1.6% (95% CI -1.623, -1.622). R1 was recorded in 2.8% of patients in the MIS group and in 4.4% of patients in the OPEN group, risk difference -1.6% (95% CI -1.649, -1.633). There were no differences between the groups in adjusted unweighted and weighted analyses. All analyses demonstrated decreased mortality and re-admissions at 30 and 90 days as well as shorter LOS following MIS.

CONCLUSIONS

In this population based setting MIS for rectal cancer was non-inferior to OPEN regarding adequacy of cancer resection with favorable short-term outcomes.

Deep neuromuscular blockade in adults undergoing an abdominal laparoscopic procedure

BACKGROUND

Laparoscopic surgery is the preferred option for many procedures. To properly perform laparoscopic surgery, it is essential that sudden movements and abdominal contractions in patients are prevented, as it limits the surgeon's view. There has been a growing interest in the potential beneficial effect of deep neuromuscular blockade (NMB) in laparoscopic surgery. Deep NMB improves the surgical field by preventing abdominal contractions, and it is thought to decrease postoperative pain. However, it is uncertain if deep NMB improves intraoperative safety and thereby improves clinical outcomes.

OBJECTIVES

To evaluate the benefits and harms of deep neuromuscular blockade versus no, shallow, or moderate neuromuscular blockade during laparoscopic intra- or transperitoneal procedures in adults.

SEARCH METHODS

We used standard, extensive Cochrane search methods. The latest search date was 31 July 2023.

SELECTION CRITERIA

We included randomised clinical trials (irrespective of language, blinding, or publication status) in adults undergoing laparoscopic intra- or transperitoneal procedures comparing deep NMB to moderate, shallow, or no NMB. We excluded trials that did not report any of the primary or secondary outcomes of our review.

DATA COLLECTION AND ANALYSIS

We used standard Cochrane methods. Our primary outcomes were 1. all-cause mortality, 2. health-related quality of life, and 3. proportion of participants with serious adverse events. Our secondary outcomes were 4. proportion of participants with non-serious adverse events, 5. readmissions within three months, 6. short-term pain scores, 7. measurements of postoperative recovery, and 8. operating time. We used GRADE to assess the certainty of evidence for each outcome.

MAIN RESULTS

We included 42 randomised clinical trials with 3898 participants. Most trials included participants undergoing intraperitoneal oncological resection surgery. We present the Peto fixed-effect model for most dichotomous outcomes as only sparse events were reported. Comparison 1: deep versus moderate NMB Thirty-eight trials compared deep versus moderate NMB. Deep NMB may have no effect on mortality, but the evidence is very uncertain (Peto odds ratio (OR) 7.22, 95% confidence interval (CI) 0.45 to 115.43; 12 trials, 1390 participants; very low-certainty evidence). Deep NMB likely results in little to no difference in health-related quality of life up to four days postoperative (mean difference (MD) 4.53 favouring deep NMB on the Quality of Recovery-40 score, 95% CI 0.96 to 8.09; 5 trials, 440 participants; moderate-certainty evidence; mean difference lower than the mean clinically important difference of 10 points). The evidence is very uncertain about the effect of deep NMB on intraoperatively serious adverse events (deep NMB 38/1150 versus moderate NMB 38/1076; Peto OR 0.95, 95% CI 0.59 to 1.52; 21 trials, 2231 participants; very low-certainty evidence), short-term serious adverse events (up to 60 days) (deep NMB 37/912 versus moderate NMB 42/852; Peto OR 0.90, 95% CI 0.56 to 1.42; 16 trials, 1764 participants; very low-certainty evidence), and short-term non-serious adverse events (Peto OR 0.94, 95% CI 0.65 to 1.35; 11 trials, 1232 participants; very low-certainty evidence). Deep NMB likely does not alter the duration of surgery (MD -0.51 minutes, 95% CI -3.35 to 2.32; 34 trials, 3143 participants; moderate-certainty evidence). The evidence is uncertain if deep NMB alters the length of hospital stay (MD -0.22 days, 95% CI -0.49 to 0.06; 19 trials, 2084 participants; low-certainty evidence) or pain scores one hour after surgery (MD -0.31 points on the numeric rating scale, 95% CI -0.59 to -0.03; 22 trials, 1823 participants; very low-certainty evidence; mean clinically important difference 1 point) and 24 hours after surgery (MD -0.60 points on the numeric rating scale, 95% CI -1.05 to -0.15; 16 trials, 1404 participants; very low-certainty evidence; mean clinically important difference 1 point). Comparison 2: deep versus shallow NMB Three trials compared deep versus shallow NMB. The trials did not report on mortality and health-related quality of life. The evidence is very uncertain about the effect of deep NMB compared to shallow NMB on the proportion of serious adverse events (RR 1.66, 95% CI 0.50 to 5.57; 2 trials, 158 participants; very low-certainty evidence). Comparison 3: deep versus no NMB One trial compared deep versus no NMB. There was no mortality in this trial, and health-related quality of life was not reported. The proportion of serious adverse events was 0/25 in the deep NMB group and 1/25 in the no NMB group.

AUTHORS' CONCLUSIONS

There was insufficient evidence to draw conclusions about the effects of deep NMB compared to moderate NMB on all-cause mortality and serious adverse events. Deep NMB likely results in little to no difference in health-related quality of life and duration of surgery compared to moderate NMB, and it may have no effect on the length of hospital stay. Due to the very low-certainty evidence, we do not know what the effect is of deep NMB on non-serious adverse events, pain scores, or readmission rates. Randomised clinical trials with adequate reporting of all adverse events would reduce the current uncertainties. Due to the low number of identified trials and the very low certainty of evidence, we do not know what the effect of deep NMB on serious adverse events is compared to shallow NMB and no NMB. We found no trials evaluating mortality and health-related quality of life.

Functional Results After Nerve-Sparing, Sphincter Preserving Rectal Cancer Surgery: Patient-Reported Outcomes of Sexual and Urinary Dysfunction

There is an ongoing unmet need of early identification and discussion regarding the sexual and urinary dysfunction in the peri-operative period to improve the quality of life (QoL), particularly in young rectal cancer survivors. Retrospective analysis of prospectively maintained database was done. Male patients less than 60 years who underwent nerve preserving, sphincter sparing rectal cancer surgery between January 2013 and December 2019, were screened. International Index of Erectile Function (IIEF-5) questionnaire was given to assess erectile dysfunction (ED). Patients were asked questions regarding their sexual and urinary function from the EORTC-QL CRC 38 questionnaire, and responses were recorded. Patients were also asked to report any retrograde ejaculation in post-operative period. Sixty-two patients were included in the study. Fifty-four patients (87.1%) received a diversion stoma. Sixteen patients (29.6%) felt stoma was interfering with their sexual function. Six patients (9.7%) reported retrograde ejaculation. Only 5 patients (8.06%) had moderate to severe ED, and the rest had none to mild ED. On univariate and multivariate analysis, only age predicted the development of clinically significant ED. Ten patients (16.1%) had significantly reduced sexual urges, and 23 patients (37.1%) had significant decrease in sexual satisfaction after surgery. Five patients (8.06%) reported having minor urinary complaints. No patient reported having major complaint pertaining to urinary health. While long-term urinary complaints are infrequent, almost half the patient suffered from erectile dysfunction in some form. There is a weak but significant association of age and ED. Follow-up clinic visits provide an ideal opportunity to counsel patients and provide any medical intervention, when necessary.

Endoscopic Management of Large Non-Pedunculated Colorectal Polyps

Large non-pedunculated colorectal polyps ≥20 mm (LNPCPs) comprise approximately 1% of all colorectal polyps. LNPCPs more commonly contain high-grade dysplasia, covert and overt cancer. These lesions can be resected using several means, including conventional endoscopic mucosal resection (EMR), cold-snare EMR (C-EMR) and endoscopic submucosal dissection (ESD). This review aimed to provide a comprehensive, critical and objective analysis of ER techniques. Evidence-based, selective resection algorithms should be used when choosing the most appropriate technique to ensure the safe and effective removal of LNPCPs. Due to its enhanced safety and comparable efficacy, there has been a paradigm shift towards cold-snare polypectomy (CSP) for the removal of small polyps (<10 mm). This technique is now being applied to the management of LNPCPs; however, further research is required to define the optimal LNPCP subtypes to target and the viable upper size limit. Adjuvant techniques, such as thermal ablation of the resection margin, significantly reduce recurrence risk. Bleeding risk can be mitigated using through-the-scope clips to close defects in the right colon. Endoscopic surveillance is important to detect recurrence and synchronous lesions. Recurrence can be readily managed using an endoscopic approach.

Response assessment of locally advanced rectal cancer after neoadjuvant chemoradiotherapy: Is apparent diffusion coefficient useful on 3 T magnetic resonance imaging?

AIM

To assess the diagnostic value of apparent diffusion coefficient (ADC) on 3 T device for the prediction of tumoral response to neoadjuvant chemoradiotherapy (nCRT) and for the response assessment after nCRT in patients with locally advanced rectal cancer (LARC), using pathology as a reference.

METHODS

Forty-one patients affected by LARC undergoing 3.0 T MRI before and after nCRT were retrospectively selected. After the conventional acquisition of high resolution T2-weighted sequences, diffusion-weighted MRI (DW-MRI) was performed using a spin-echo echo-planar sequence with multiple b values (150, 500, 1000, 1500 s/mm² ). Fitted ADC values were calculated for each rectal lesion before and after nCRT by drawing a hand-made region of interest (ROI) around the tumour outline. All patients underwent surgery and pathological staging (classified according to tumour regression grading [TRG] and to tumour and node [TN]) represented the reference standard. Pretreatment ADC value (pre-ADC), ADC value obtained after nCRT (post-ADC) and the difference between post-ADC and pre-ADC (ΔADC) were correlated with both the TRG classes and the TN staging system in each patient.

RESULTS

The ADC values obtained in the post nCRT examination and the ΔADC were statistically related both to TRG (p = 0.0004; p = 0.0126, respectively) and TN (p = 0.0484; p = 0.0673, respectively) stages at histopathology. On the contrary, the pre-ADC was not related either to the TRG classes or to the lesion TN staging system (p > 0.05).

CONCLUSIONS

3 T DW-MRI using ADC value can be useful to assess the efficacy of nCRT in LARC; in fact, post-ADC and ΔADC values improve MR capability to evaluate tumour response.

Implementation of robotic rectal cancer surgery: a cross-sectional nationwide study

AIM

An increasing number of centers have implemented a robotic surgical program for rectal cancer. Several randomized controls trials have shown similar oncological and postoperative outcomes compared to standard laparoscopic resections. While introducing a robot rectal resection program seems safe, there are no data regarding implementation on a nationwide scale. Since 2018 robot resections are separately registered in the mandatory Dutch Colorectal Audit. The present study aims to evaluate the trend in the implementation of robotic resections (RR) for rectal cancer relative to laparoscopic rectal resections (LRR) in the Netherlands between 2018 and 2020 and to compare the differences in outcomes between the operative approaches.

METHODS

Patients with rectal cancer who underwent surgical resection between 2018 and 2020 were selected from the Dutch Colorectal Audit. The data included patient characteristics, disease characteristics, surgical procedure details, postoperative outcomes. The outcomes included any complication within 90 days after surgery; data were categorized according to surgical approach.

RESULTS

Between 2018 and 2020, 6330 patients were included in the analyses. 1146 patients underwent a RR (18%), 3312 patients a LRR (51%), 526 (8%) an open rectal resection, 641 a TaTME (10%), and 705 had a local resection (11%). The proportion of males and distal tumors was higher in the RR compared to the LRR. Over time, the proportion of robotic procedures increased from 15% (95% confidence intervals (CI) 13-16%) in 2018 to 22% (95% CI 20-24%) in 2020. Conversion rate was lower in the robotic group [4% (95% CI 3-5%) versus 7% (95% CI 6-8%)]. Anastomotic leakage rate was similar with 16%. Defunctioning ileostomies were more common in the RR group [42% (95% CI 38-46%) versus 29% (95% CI 26-31%)].

CONCLUSION

Rectal resections are increasingly being performed through a robot-assisted approach in the Netherlands. The proportion of males and low rectal cancers was higher in RR compared to LRR. Overall outcomes were comparable, while conversion rate was lower in RR, the proportion of defunctioning ileostomies was higher compared to LRR.

Robotic-Assisted versus Laparoscopic Left Hemicolectomy-Postoperative Inflammation Status, Short-Term Outcome and Cost Effectiveness

Robotic-assisted colon surgery may contain advantages over the laparoscopic approach, but clear evidence is sparse. This study aimed to analyze postoperative inflammation status, short-term outcome and cost-effectiveness of robotic-assisted versus laparoscopic left hemicolectomy. All consecutive patients who received minimal-invasive left hemicolectomy at the Department of Surgery I at the University Hospital of Wuerzburg in 2021 were prospectively included. Importantly, no patient selection for either procedure was carried out. The robotic-assisted versus laparoscopic approaches were compared head to head for postoperative short-term outcomes as well as cost-effectiveness. A total of 61 patients were included, with 26 patients having received a robotic-assisted approach. Baseline characteristics did not differ among the groups. Patients receiving a robotic-assisted approach had a significantly decreased length of hospital stay as well as lower rates of complications in comparison to patients who received laparoscopic surgery (n = 35). In addition, C-reactive protein as a marker of systemic stress response was significantly reduced postoperatively in patients who were operated on in a robotic-assisted manner. Consequently, robotic-assisted surgery could be performed in a cost-effective manner. Thus, robotic-assisted left hemicolectomy represents a safe and cost-effective procedure and might improve patient outcomes in comparison to laparoscopic surgery.

Comparison of the morphology and histopathology of large nonpedunculated colorectal polyps in the rectum and colon: implications for endoscopic treatment

BACKGROUND AND AIMS

The risk of cancer in large nonpedunculated colorectal polyps ≥20 mm (LNPCPs) in the rectum relative to the remainder of the colon is unknown. We aimed to describe differences between rectal and colonic LNPCPs to better inform treatment decisions.

METHODS

Patients with LNPCPs referred to tertiary centers for endoscopic resection within a prospective, multicenter, observational cohort were evaluated. Data recorded were participant demographics, LNPCP location, morphology, resection modality, and histopathologic data. Multiple logistic regression analysis was used to identify those variables independently associated with rectal versus nonrectal location in the colon.

RESULTS

Patients with LNPCPs referred for endoscopic resection between July 2008 and July 2021 were included. Rectal LNPCPs (n = 618) were larger (median size, 40 mm vs 30 mm; P < .001) and more likely to be granular (79% vs 50%, P < .001) with a nodular component (53% vs 17%, P < .001) compared with nonrectal LNPCPs (n = 2787). Rectal LNPCPs were more likely to have tubulovillous histopathology (72% vs 47%, P < .001) and contain cancer (15% vs 6%, P < .001). After adjusting for the other features independently associated with location, cancer was more common in the rectum compared with the colon (odds ratio, 1.77; 95% confidence interval, 1.25-2.53).

CONCLUSIONS

This study suggests that compared with LNPCPs in the rest of the colon, rectal LNPCPs are more likely to be larger and contain more advanced pathology. These findings have implications for curative endoscopic resection techniques particularly where early cancer is present. (Clinical trial registration numbers: NCT01368289 and NCT02000141.).

Quality of life in Tunisian colorectal cancer patients: a cross-sectional study

PURPOSE

Quality of life (QOL) of colorectal cancer (CRC) patients has been little studied in Tunisia. The aim of this work was to evaluate the QOL of CRC patients and to identify factors that may influence it.

METHODS

A cross-sectional, study spread was made over a period of 6 months on patients with CRC treated in the department of Medical Oncology of Farhat Hached University Hospital of Sousse. The EORTC questionnaires translated and validated in Arabic (QLQ-C30 and QLQ-CR29) were used.

RESULTS

142 patients diagnosed with colon or rectal cancer were enrolled. The overall QOL score was 58.5 ± 29.1. The emotional and sexual functional dimensions were the most affected, especially in women and patients under 50 years of age. QOL scores were higher in patients who were in complete remission (71.4 ± 24.7) and in good general condition (63.7 ± 26.6) physical activity may have a significant influence on all functional dimensions of QOL (p < 0.001). Fatigue was significantly (p < 0.001) more present when there was a sedentary lifestyleradiotherapy, palliative chemotherapy (1st and 2nd line) and targeted therapy.

CONCLUSION

Evaluating quality of life of patients with colorectal cancer in Tunisia is necessary especially those under 50 years old and in women. Laparoscopic surgery with restoration of intestinal continuity, less toxic palliative chemotherapy protocols, more accessibility to new radiotherapy technics will improve QOL of CRC patients. Physical activity and nutrition support are also essential in promoting QOL of these patients.

Analysis of Opioid Use in Patients Undergoing Open Versus Robotic Gastrectomy

BACKGROUND

Minimally invasive, robotic gastrectomy is associated with better short-term outcomes and quicker functional recovery. However, the degree to which the robotic approach influences postoperative pain and opioid use after gastrectomy is unknown. Our primary aim was to determine whether the robotic approach to gastrectomy reduces postoperative opioid use compared with the open approach.

METHODS

Patients who underwent gastrectomy (November 2018 to September 2021) were identified retrospectively. Clinical characteristics, short-term surgical outcomes, oral morphine equivalent (OME) use, and pain scores were collected. Both groups were managed through an enhanced recovery program in the perioperative period.

RESULTS

Of 81 patients, 50 underwent open and 31 underwent robotic gastrectomy. Compared with open gastrectomy patients, robotic gastrectomy patients had longer surgery time (360 vs. 288 min), less blood loss (50 vs. 138 mL), and shorter hospital stay (4 vs. 6 days) (all medians, P < 0.001). Robotic gastrectomy patients used lower OMEs on postoperative days 0-4 (all P < 0.05) and in total for days 0-4 (total mean dose 65.0 vs. 169.5 mg; P < 0.001) than did open gastrectomy patients. The robotic gastrectomy patients were prescribed a lower mean OME dose than the open gastrectomy patients (19.0 vs. 29.0 mg, respectively; P = 0.001). Multivariable analysis showed that robotic approach was associated with lower opioid use (odds ratio 3.70; 95% CI 1.01-14.3; P = 0.049).

CONCLUSIONS

Compared with open gastrectomy, robotic gastrectomy reduces opioid use in the early postoperative period and is associated with fewer OME discharge prescriptions and shorter hospital stay.

Anastomotic leakage following restorative rectal cancer resection: treatment and impact on stoma presence 1 year after surgery-a population-based study

PURPOSE

Anastomotic leakage (AL) continues to be a challenge after restorative rectal resection (RRR). Various treatment options of AL are available; however, their long-term outcomes are uncertain. We explored the impact of AL on the risk of stoma presence 1 year after RRR for rectal cancer and described treatment of AL after RRR including impact on the probability of receiving adjuvant chemotherapy and stoma presence following different treatment options of AL.

METHODS

We included 859 patients undergoing RRR in Central Denmark Region between 2013 and 2019. Stoma presence was calculated as the proportion of patients with stoma 1 year after RRR. Multivariable logistic regression was conducted to estimate the impact of AL on stoma presence adjusting for potential predictors. Descriptive data of outcomes were stratified for various treatment options of AL.

RESULTS

The risk of stoma presence 1 year after surgery was 9.8% (95% CI 7.98-12.0). Predictors for having stoma 1 year after RRR were AL (OR 8.43 (95% CI 4.87-14.59)) and low tumour height (OR 3.85 (95% CI 1.22-13.21)). For patients eligible for adjuvant chemotherapy, the probability of receiving it was 42.9% (95% CI 21.8-66.0) if treated with endo-SPONGE and 71.4% (95% CI 47.8-88.7) if treated with other anastomosis preserving treatment options. The risk of having stoma 1 year after RRR was 33.9% (95% CI 21.8-47.8) for patients treated with endo-SPONGE and 13.5% (95% CI 5.6-25.8) for patients treated with other anastomosis preserving treatment options (p = 0.013).

CONCLUSION

AL is a strong predictor for stoma presence 1 year after RRR. Patients treated with endo-SPONGE seem to have worse outcomes compared to other anastomosis preserving treatment options.

Attitudes towards Enhanced Recovery after Surgery (ERAS) interventions in colorectal surgery: nationwide survey of Australia and New Zealand colorectal surgeons

BACKGROUND

Whilst Enhanced Recovery after Surgery (ERAS) has been widely accepted in the international colorectal surgery community, there remains significant variations in ERAS programme implementations, compliance rates and best practice recommendations in international guidelines.

METHODS

A questionnaire was distributed to colorectal surgeons from Australia and New Zealand after ethics approval. It evaluated specialist attitudes towards the effectiveness of specific ERAS interventions in improving short term outcomes after colorectal surgery. The data were analysed using a rating scale and graded response model in item response theory (IRT) on Stata MP, version 15 (StataCorp LP, College Station, TX).

RESULTS

Of 300 colorectal surgeons, 95 (31.7%) participated in the survey. Of eighteen ERAS interventions, this study identified eight strategies as most effective in improving ERAS programmes alongside early oral feeding and mobilisation. These included pre-operative iron infusion for anaemic patients (IRT score = 7.82 [95% CI: 6.01-9.16]), minimally invasive surgery (IRT score = 7.77 [95% CI: 5.96-9.07]), early in-dwelling catheter removal (IRT score = 7.69 [95% CI: 5.83-9.01]), pre-operative smoking cessation (IRT score = 7.68 [95% CI: 5.49-9.18]), pre-operative counselling (IRT score = 7.44 [95% CI: 5.58-8.88]), avoiding drains in colon surgery (IRT score = 7.37 [95% CI: 5.17-8.95]), avoiding nasogastric tubes (IRT score = 7.29 [95% CI: 5.32-8.8]) and early drain removal in rectal surgery (IRT score = 5.64 [95% CI: 3.49-7.66]).

CONCLUSIONS

This survey has demonstrated the current attitudes of colorectal surgeons from Australia and New Zealand regarding ERAS interventions. Eight of the interventions assessed in this study including pre-operative iron infusion for anaemic patients, minimally invasive surgery, early in-dwelling catheter removal, pre-operative smoking cessation, pre-operative counselling, avoidance of drains in colon surgery, avoiding nasogastric tubes and early drain removal in rectal surgery should be considered an important part of colorectal ERAS programmes.

UEG and EAES rapid guideline: Systematic review, meta-analysis, GRADE assessment and evidence-informed European recommendations on TaTME for rectal cancer

Background

Evidence and practice recommendations on the use of transanal total mesorectal excision (TaTME) for rectal cancer are conflicting.

Objective

We aimed to summarize best evidence and develop a rapid guideline using transparent, trustworthy, and standardized methodology.

Methods

We developed a rapid guideline in accordance with GRADE, G-I-N, and AGREE II standards. The steering group consisted of general surgeons, members of the EAES Research Committee/Guidelines Subcommittee with expertise and experience in guideline development, advanced medical statistics and evidence synthesis, biostatisticians, and a guideline methodologist. The guideline panel consisted of four general surgeons practicing colorectal surgery, a radiologist with expertise in rectal cancer, a radiation oncologist, a pathologist, and a patient representative. We conducted a systematic review and the results of evidence synthesis by means of meta-analyses were summarized in evidence tables. Recommendations were authored and published through an online authoring and publication platform (MAGICapp), with the guideline panel making use of an evidence-to-decision framework and a Delphi process to arrive at consensus.

Results

This rapid guideline provides a weak recommendation for the use of TaTME over laparoscopic or robotic TME for low rectal cancer when expertise is available. Furthermore, it details evidence gaps to be addressed by future research and discusses policy considerations. The guideline, with recommendations, evidence summaries, and decision aids in user-friendly formats can also be accessed in MAGICapp: https://app.magicapp.org/#/guideline/4494.

Conclusions

This rapid guideline provides evidence-informed trustworthy recommendations on the use of TaTME for rectal cancer.

Supplementary Information

The online version contains supplementary material available at 10.1007/s00464-022-09090-4.

Local recurrence of robot-assisted total mesorectal excision: a multicentre cohort study evaluating the initial cases

PURPOSE

Evidence regarding local recurrence rates in the initial cases after implementation of robot-assisted total mesorectal excision is limited. This study aims to describe local recurrence rates in four large Dutch centres during their initial cases.

METHODS

Four large Dutch centres started with the implementation of robot-assisted total mesorectal excision in respectively 2011, 2012, 2015, and 2016. Patients who underwent robot-assisted total mesorectal excision with curative intent in an elective setting for rectal carcinoma defined according to the sigmoid take-off were included. Overall survival, disease-free survival, systemic recurrence, and local recurrence were assessed at 3 years postoperatively. Subsequently, outcomes between the initial 10 cases, cases 11-40, and the subsequent cases per surgeon were compared using Cox regression analysis.

RESULTS

In total, 531 patients were included. Median follow-up time was 32 months (IQR: 19-50]. During the initial 10 cases, overall survival was 89.5%, disease-free survival was 73.1%, and local recurrence was 4.9%. During cases 11-40, this was 87.7%, 74.1%, and 6.6% respectively. Multivariable Cox regression did not reveal differences in local recurrence between the different case groups.

CONCLUSION

Local recurrence rate during the initial phases of implantation of robot-assisted total mesorectal procedures is low. Implementation of the robot-assisted technique can safely be performed, without additional cases of local recurrence during the initial cases, if performed by surgeons experienced in laparoscopic rectal cancer surgery.

Mid- and low-rectal cancer: laparoscopic vs open treatment-short- and long-term results. Meta-analysis of randomized controlled trials

BACKGROUND

The laparoscopic approach in the treatment of mid- or low-rectal cancer is still controversial. Compared with open surgery, laparoscopic resection of extraperitoneal cancer is associated with improved short-time non-oncological outcomes, although high-level evidence showing similar short- and long-term oncological outcomes is scarce.

OBJECTIVE

The aim of our paper is to study the oncological and non-oncological outcomes of laparoscopic versus open surgery for extraperitoneal rectal cancer.

DATA SOURCES

A systematic review of MedLine, EMBASE, and CENTRAL from January 1990 to October 2020 was performed by combining various key words.

STUDY SELECTION

Only randomized controlled trials (RCTs) comparing laparoscopic versus open surgery for extraperitoneal rectal cancer were included. The quality of RCTs was assessed using the Cochrane reviewer's handbook. This meta-analysis was based on the recommendation of the Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines.

INTERVENTION(S)

This study analyzes laparoscopic versus open surgery for extraperitoneal rectal cancer.

MAIN OUTCOME MEASURES

Primary outcomes were oncological parameters.

RESULTS

Fifteen RCTs comprising 4,411 patients matched the selection criteria. Meta-analysis showed a significant difference between laparoscopic and open surgery in short-time non-oncological outcomes. Although laparoscopic approach increased operation time, it decreases significantly the blood loss and length of hospital stay. No significant difference was noted regarding short- and long-term oncological outcomes, but 4 and 5 years disease-free survival were statistically higher in the open group.

LIMITATIONS

There are still questions about the long-term oncological outcomes of laparoscopic surgery for extraperitoneal rectal cancer being comparable to the open technique.

CONCLUSIONS

Considering that all surgical resections have been performed in high volume centers by expert surgeons, the minimally invasive surgery in patients with extraperitoneal cancer could still be not considered equivalent to open surgery in terms of oncological radicality.

Laparoscopic Versus Robot-Assisted Versus Transanal Low Anterior Resection: 3-Year Oncologic Results for a Population-Based Cohort in Experienced Centers

BACKGROUND

Laparoscopic, robot-assisted, and transanal total mesorectal excision are the minimally invasive techniques used most for rectal cancer surgery. Because data regarding oncologic results are lacking, this study aimed to compare these three techniques while taking the learning curve into account.

METHODS

This retrospective population-based study cohort included all patients between 2015 and 2017 who underwent a low anterior resection at 11 dedicated centers that had completed the learning curve of the specific technique. The primary outcome was overall survival (OS) during a 3-year follow-up period. The secondary outcomes were 3-year disease-free survival (DFS) and 3-year local recurrence rate. Statistical analysis was performed using Cox-regression.

RESULTS

The 617 patients enrolled in the study included 252 who underwent a laparoscopic resection, 205 who underwent a robot-assisted resection, and 160 who underwent a transanal low anterior resection. The oncologic outcomes were equal between the three techniques. The 3-year OS rate was 90% for laparoscopic resection, 90.4% for robot-assisted resection, and 87.6% for transanal low anterior resection. The 3-year DFS rate was 77.8% for laparoscopic resection, 75.8% for robot-assisted resection, and 78.8% for transanal low anterior resection. The 3-year local recurrence rate was in 6.1% for laparoscopic resection, 6.4% for robot-assisted resection, and 5.7% for transanal procedures. Cox-regression did not show a significant difference between the techniques while taking confounders into account.

CONCLUSION

The oncologic results during the 3-year follow-up were good and comparable between laparoscopic, robot-assisted, and transanal total mesorectal technique at experienced centers. These techniques can be performed safely in experienced hands.

Spotlight on Laparoscopy in the Surgical Resection of Locally Advanced Rectal Cancer: Multicenter Propensity Score Match Study

Purpose

This study was aimed to assess the feasibility of laparoscopic rectal surgery, comparing quality of surgical specimen, morbidity, and mortality.

Methods

Prospectively acquired data from consecutive patients undergoing laparoscopic surgery for rectal cancer, at 2 minimally invasive colorectal units, operated by the same team was included. Locally advanced rectal tumors were identified as T3B or T4 with preoperative magnetic resonance imaging scans. All the patients were operated on by the same team. The 1:1 propensity score matching was performed to create a perfect match in terms of tumor height.

Results

Total of 418 laparoscopic resections were performed, out of which 109 patients had locally advanced rectal cancer (LARC) and were propensity score matched with non-LARC (NLARC) patients. Median operation time was higher for the LARC group (270 minutes vs. 250 minutes, P=0.011). However, conversion to open surgery was done in 5 vs. 2 patients (P=0.445), reoperation in 8 vs. 7 (P=0.789), clinical anastomotic leak was found in 3 vs. 2 (P=0.670), and 30-day mortality rates was 2 vs. 1 (P>0.999) between LARC and NLARC, respectively. Readmission rate was higher in the NLARC group (33 patients vs. 19 patients, P=0.026), due to stoma-related issues. There was no statistically significant difference in the R0 resection between the 2 groups (99 patients in LARC vs. 104 patients in NLARC, P=0.284).

Conclusion

This study demonstrates that standardized approach to laparoscopy is safe and feasible in LARC. Comparable postoperative short-term clinical and pathological outcomes were seen between LARC and NLARC groups.

Predictive and Diagnostic Biomarkers of Anastomotic Leakage: A Precision Medicine Approach for Colorectal Cancer Patients

Development of an anastomotic leak (AL) following intestinal surgery for the treatment of colorectal cancers is a life-threatening complication. Failure of the anastomosis to heal correctly can lead to contamination of the abdomen with intestinal contents and the development of peritonitis. The additional care that these patients require is associated with longer hospitalisation stays and increased economic costs. Patients also have higher morbidity and mortality rates and poorer oncological prognosis. Unfortunately, current practices for AL diagnosis are non-specific, which may delay diagnosis and have a negative impact on patient outcome. To overcome these issues, research is continuing to identify AL diagnostic or predictive biomarkers. In this review, we highlight promising candidate biomarkers including ischaemic metabolites, inflammatory markers and bacteria. Although research has focused on the use of blood or peritoneal fluid samples, we describe the use of implantable medical devices that have been designed to measure biomarkers in peri-anastomotic tissue. Biomarkers that can be used in conjunction with clinical status, routine haematological and biochemical analysis and imaging have the potential to help to deliver a precision medicine package that could significantly enhance a patient's post-operative care and improve outcomes. Although no AL biomarker has yet been validated in large-scale clinical trials, there is confidence that personalised medicine, through biomarker analysis, could be realised for colorectal cancer intestinal resection and anastomosis patients in the years to come.

Association of Surgical Skill Assessment With Clinical Outcomes in Cancer Surgery

Importance

Complex surgical interventions are inherently prone to variation yet they are not objectively measured. The reasons for outcome differences following cancer surgery are unclear.

Objective

To quantify surgical skill within advanced laparoscopic procedures and its association with histopathological and clinical outcomes.

Design, Setting, and Participants

This analysis of data and video from the Australasian Laparoscopic Cancer of Rectum (ALaCaRT) and 2-dimensional/3-dimensional (2D3D) multicenter randomized laparoscopic total mesorectal excision trials, which were conducted at 28 centers in Australia, the United Kingdom, and New Zealand, was performed from 2018 to 2019 and included 176 patients with clinical T1 to T3 rectal adenocarcinoma 15 cm or less from the anal verge. Case videos underwent blinded objective analysis using a bespoke performance assessment tool developed with a 62-international expert Delphi exercise and workshop, interview, and pilot phases.

Interventions

Laparoscopic total mesorectal excision undertaken with curative intent by 34 credentialed surgeons.

Main Outcomes and Measures

Histopathological (plane of mesorectal dissection, ALaCaRT composite end point success [mesorectal fascial plane, circumferential margin, ≥1 mm; distal margin, ≥1 mm]) and 30-day morbidity. End points were analyzed using surgeon quartiles defined by tool scores.

Results

The laparoscopic total mesorectal excision performance tool was produced and shown to be reliable and valid for the specialist level (intraclass correlation coefficient, 0.889; 95% CI, 0.832-0.926; P < .001). A substantial variation in tool scores was recorded (range, 25-48). Scores were associated with the number of intraoperative errors, plane of mesorectal dissection, and short-term patient morbidity, including the number and severity of complications. Upper quartile-scoring surgeons obtained excellent results compared with the lower quartile (mesorectal fascial plane: 93% vs 59%; number needed to treat [NNT], 2.9, P = .002; ALaCaRT end point success, 83% vs 58%; NNT, 4; P = .03; 30-day morbidity, 23% vs 50%; NNT, 3.7; P = .03).

Conclusions and Relevance

Intraoperative surgical skill can be objectively and reliably measured in complex cancer interventions. Substantial variation in technical performance among credentialed surgeons is seen and significantly associated with clinical and pathological outcomes.

Preoperative intravenous iron for anaemia in elective major open abdominal surgery: the PREVENTT RCT

BACKGROUND

Anaemia affects 30-50% of patients before they undergo major surgery. Preoperative anaemia is associated with increased need for blood transfusion, postoperative complications and worse patient outcomes after surgery. International guidelines support the use of intravenous iron to correct anaemia in patients before surgery. However, the use of preoperative intravenous iron for patient benefit has not been assessed in the setting of a formal clinical trial.

OBJECTIVES

To assess if intravenous iron given to patients with anaemia before major abdominal surgery is beneficial by reducing transfusion rates, postoperative complications, hospital stay and re-admission to hospital, and improving quality of life outcomes.

DESIGN

A multicentre, double-blinded, randomised, controlled, Phase III clinical trial, with 1 : 1 randomisation comparing placebo (normal saline) with intravenous iron (intravenous ferric carboxymaltose 1000 mg). Randomisation and treatment allocation were by a secure web-based service.

SETTING

The study was conducted across 46 hospitals in England, Scotland and Wales between September 2013 and September 2018.

PARTICIPANTS

Patients aged > 18 years, undergoing elective major open abdominal surgery, with anaemia [Hb level of > 90 g/l and < 120 g/l (female patients) and < 130 g/l (male patients)] who could undergo randomisation and treatment 10-42 days before their operation.

INTERVENTION

Double-blinded study comparing placebo of normal saline with 1000 mg of ferric carboxymaltose administered 10-42 days prior to surgery.

MAIN OUTCOME MEASURES

Co-primary end points were risk of blood transfusion or death at 30 days postoperatively, and rate of blood transfusions at 30 days post operation.

RESULTS

A total of 487 patients were randomised (243 given placebo and 244 given intravenous iron), of whom 474 completed the trial and provided data for the analysis of the co-primary end points. The use of intravenous iron increased preoperative Hb levels (mean difference 4.7 g/l, 95% confidence interval 2.7 to 6.8 g/l; p < 0.0001), but had no effect compared with placebo on risk of blood transfusion or death (risk ratio 1.03, 95% confidence interval 0.78 to 1.37; p = 0.84; absolute risk difference +0.8%, 95% confidence interval -7.3% to 9.0%), or rates of blood transfusion (rate ratio 0.98, 95% confidence interval 0.68 to 1.43; p = 0.93; absolute rate difference 0.00, 95% confidence interval -0.14 to 0.15). There was no difference in postoperative complications or hospital stay. The intravenous iron group had higher Hb levels at the 8-week follow-up (difference in mean 10.7 g/l, 95% confidence interval 7.8 to 13.7 g/l; p < 0.0001). There were a total of 71 re-admissions to hospital for postoperative complications in the placebo group, compared with 38 re-admissions in the intravenous iron group (rate ratio 0.54, 95% confidence interval 0.34 to 0.85; p = 0.009). There were no differences between the groups in terms of mortality (two per group at 30 days post operation) or in any of the prespecified safety end points or serious adverse events.

CONCLUSIONS

In patients with anaemia prior to elective major abdominal surgery, there was no benefit from giving intravenous iron before the operation.

FUTURE WORK

The impact of iron repletion on recovery from postoperative anaemia, and the association with reduced re-admission to hospital for complications, should be investigated.

LIMITATIONS

In the preoperative intravenous iron to treat anaemia in major surgery (PREVENTT) trial, all patients included had anaemia and only 20% had their anaemia corrected before surgery. The definition and causality of iron deficiency in this setting is not clear.

TRIAL REGISTRATION

Current Controlled Trials ISRCTN67322816 and ClinicalTrials.gov NCT01692418.

FUNDING

This project was funded by the National Institute for Health Research (NIHR) Health Technology Assessment programme and will be published in full in Health Technology Assessment; Vol. 25 No. 11. See the NIHR Journals Library website for further project information.

The safety and efficacy of laparoscopic surgery versus laparoscopic NOSE for sigmoid and rectal cancer

BACKGROUND

Laparoscopic surgery with natural orifice specimen extraction (La-NOSE) is being performed more frequently for the minimally invasive management of sigmoid and rectal cancer. The objective of this meta-analysis was to compare the clinical and oncological safety and efficacy of La-NOSE versus conventional laparoscopy (CL).

METHODS

A search of the PubMed, Web of Science, and Cochrane databases was performed for studies that compared clinical or oncological outcomes of conventional laparoscopic resection using NOSE with conventional laparoscopic resection for sigmoid and rectal cancer.

RESULTS

Compared with CL group, the length of hospital stay and the pain score on the first day were shorter in the La-Nose group. The La-NOSE group had a lower incidence of total perioperative complications (OR 0.46; 95% CI [0.32 to 0.66]; I² = 0%; P < 0.0001) and a lower incidence of surgical site infections (SSIs) (OR 0.11; 95% CI [0.04 to 0.29]; I² = 0%; P < 0.0001) than the CL group, while the anastomotic leakage showed no significant difference between the La-Nose group and the CL group (P = 0.19). 5-year disease-free survival (DFS) and 5-year overall survival (OS) were no significant difference between the La-Nose group and the CL group (P = 0.43, P = 0.40, respectively).

CONCLUSIONS

La-NOSE can achieve oncological and surgical safety comparable to that of CL for patients with sigmoid and rectal cancer. La-NOSE in patients was associated with a shorter hospital stay, shorter time to first flatus or defecation, less postoperative pain, and fewer surgical site infections (SSIs) and total perioperative complications. In general, the operative time in La-NOSE was longer than that in CL. The long-term oncological efficacy of La-NOSE seems to be equivalent to that of CL.

Simultaneous colorectal and parenchymal-sparing liver resection for advanced colorectal carcinoma with synchronous liver metastases: Between conventional and mini-invasive approaches

The optimal timing of surgery in case of synchronous presentation of colorectal cancer and liver metastases is still under debate. Staged approach, with initial colorectal resection followed by liver resection (LR), or even the reverse, liver-first approach in specific situations, is traditionally preferred. Simultaneous resections, however, represent an appealing strategy, because may have perioperative risks comparable to staged resections in appropriately selected patients, while avoiding a second surgical procedure. In patients with larger or multiple synchronous presentation of colorectal cancer and liver metastases, simultaneous major hepatectomies may determine worse perioperative outcomes, so that parenchymal-sparing LR should represent the most appropriate option whenever feasible. Mini-invasive colorectal surgery has experienced rapid spread in the last decades, while laparoscopic LR has progressed much slower, and is usually reserved for limited tumours in favourable locations. Moreover, mini-invasive parenchymal-sparing LR is more complex, especially for larger or multiple tumours in difficult locations. It remains to be established if simultaneous resections are presently feasible with mini-invasive approaches or if we need further technological advances and surgical expertise, at least for more complex procedures. This review aims to critically analyze the current status and future perspectives of simultaneous resections, and the present role of the available mini-invasive techniques.

Acquiring Advanced Laparoscopic Colectomy Skills - The Issues

Colorectal surgery has been revolutionised towards minimally invasive surgery with the emergence of enhanced recovery protocol after surgery initiatives. However, laparoscopic colectomy has yet to be widely adopted, due mainly to the steep learning curve. We aim to review and discuss the methods of overcoming these learning curves by accelerating the competency level of the trainees without compromising patient safety. To provide this mini review, we assessed 70 articles in PubMed that were found through a search comprised the keywords laparoscopic colectomy, minimal invasive colectomy, learning curve and surgical education. We found England's Laparoscopic Colorectal National Training Programme (LAPCO-NTP) England to be by far the most structured programme established for colorectal surgeons, which involves pre-clinical and clinical phases that end with an assessment. For budding colorectal trainees, learning may be accelerated by simulator-based training to achieve laparoscopic dexterity coupled with an in-theatre proctorship by field experts. Task-specific checklists and video recordings are essential adjuncts to gauge progress and performance. As competency is established, careful case selections with the proctor are essential to maintain motivation and ensure safe performances. A structured programme to establish competency is vital to help both the proctor and trainee gauge real-time progress and performance. However, training systems both inside and outside the operating theatre (OT) are equally useful to achieve the desired performance.

Current Surgical Strategies for the Treatment of Rectal Adenocarcinoma and the Risk of Local Recurrence

BACKGROUND

Despite new medical and surgical strategies, 5-year local recurrence of rectal adenocarcinoma was reported in up to 25% of cases. Therefore, we aimed to review surgical strategies for the prevention of local recurrences in rectal cancer.

SUMMARY

After implementation of the total mesorectal excision (TME), surgical resection of rectal adenocarcinoma with anterior resection or abdominoperineal excision (APE) allowed decrease in local recurrence (3% at 5 years). More recently, extralevator APE was described as an alternative to APE, decreasing specimen perforation and recurrence rate. Moreover, technique modifications were developed to optimize rectal resection, such as the laparoscopic or robotic approach, and transanal TME. However, the technical advantages conferred by these techniques did not translate into a decreased recurrence rate. Lateral lymph node dissection is another technique, which aimed at improving the long-term outcomes; nevertheless, there is currently no evidence to recommend its routine use. Strategies to preserve the rectum are also emerging, such as local excision, and may be beneficial for subgroups of patients. Key Messages: Rectal cancer management requires a multidisciplinary approach, and surgical strategy should be tailored to patient factors: general health, previous perineal intervention, anatomy, preference, and tumor characteristics such as stage and localization.

The Usefulness of a 180° Rotatable Monitor for an Assistant to Overcome the Hand-Eye Discordance in Laparoscopic Colorectal Surgery

Purpose

Hand-eye discordance during laparoscopic colon surgery is an obstacle to the assistant. We evaluated the usefulness of a 180° rotatable laparoscopic monitor for the colorectal surgery assistant to overcome hand-eye discordance.

Methods

Twenty-six residents of the department of surgery (novice group, n=13; experienced group, n=13) participated in this study. They performed grasping a ring and transferring it to standing bars on a laparoscopic training kit under the conventional view and a 180° rotated monitor view. We defined successful performance when this procedure was completed in 3 minutes.

Results

The number of successful performance was higher under the 180° rotated monitor view than under the conventional view monitor (6.88±2.79 vs. 0.92±0.80, p<0.01). Under the 180° rotated monitor view, the experienced group had a higher number of successful performances than the novice group (8.31±2.59 vs. 5.46±2.26, p=0.009). However, no statistically significant difference was found between the two groups under the conventional view (1.23±0.93 vs. 0.62±0.51, p=0.091).

Conclusion

This study shows the usefulness of a 180° rotated monitor view to overcome hand-eye discordance, which adversely affects the laparoscopic performance of the colorectal surgery assistant.

Influence of tumor location on short- and long-term outcomes after laparoscopic surgery for rectal cancer: a propensity score matched cohort study

BACKGROUND

This study aimed to evaluate the short- and long-term outcomes after laparoscopic resection for low rectal cancer (LRC) compared with mid/high rectal cancer (M/HRC).

METHODS

Patients with rectal cancer undergoing laparoscopic resection with curative intent were retrospectively reviewed between 2009 and 2015. After matched 1:1 by using propensity score analysis, perioperative and oncological outcomes were compared between LRC and M/HRC groups. Multivariate analysis was performed to identify independent factors of overall survival (OS) and disease-free survival (DFS).

RESULTS

Of 373 patients who met the criteria for inclusion, 198 patients were matched for the analysis. Laparoscopic surgery for LRC required longer operative time (P<0.001) and more blood loss volume (P = 0.015) compared with M/HRC, and the LRC group tended to have a higher incidence of postoperative complications (16.2% vs. 8.1%, P = 0.082). There was no significant difference in local recurrence between the two groups (9.1% vs. 4.0%, P = 0.251), whereas distant metastasis was inclined to be more frequent in LRC patients compared with M/HRC (21.2% vs. 12.1%, P = 0.086). The LRC group showed significantly inferior 5-year OS (77.0% vs. 86.4%, P = 0.033) and DFS (71.2% vs. 86.2%, P = 0.017) compared with the M/HRC group. Multivariate analysis indicated that tumor location was an independent predictor of DFS (HR = 2.305, 95% CI 1.203-4.417, P = 0.012).

CONCLUSION

Tumor location of the rectal cancer significantly affected the clinical and oncological outcomes after laparoscopic surgery, and it was an independent predictor of DFS.

Three-dimensional Versus Two-dimensional Laparoscopic Surgery for Colorectal Cancer: Systematic Review and Meta-analysis

BACKGROUND/AIM

Three-dimensional (3D) laparoscopy is being steadily adopted instead of two-dimensional (2D) for various procedures. Our aim was to compare the outcomes between 2D and 3D laparoscopic procedures for colorectal cancer in order to ascertain the safety, efficacy and potential advantages of 3D imaging systems.

MATERIALS AND METHODS

A systematic database search was conducted in March 2019. Comparative studies reporting clinical outcomes between patients undergoing elective colorectal procedures using either 2D or 3D laparoscopic equipment were eligible.

RESULTS

Six studies were selected, including 614 patients in total. Minor reduction in operative time, similar blood loss and increased number of harvested lymph nodes was noted for the 3D group. There was no difference for conversion to open surgery, time to flatus, postoperative hospital stay or postoperative complications.

CONCLUSION

3D Laparoscopic surgery for colorectal cancer may result in reduction of operative time and higher lymph node yields, leading to improved survival.

Real-world impact of laparoscopic surgery for rectal cancer: a population-based analysis

Background

Randomized trials have demonstrated equivalent oncologic outcomes and decreased morbidity in patients with rectal cancer who undergo laparoscopic surgery (lapsx) compared with open surgery (opensx). The objective of the present study was to compare short-term outcomes after lapsx and opensx in a real-world setting.

Methods

A national discharge abstract database was used to identify all patients who underwent rectal cancer resection in Canada (excluding Quebec) from April 2004 through March 2015. Short-term outcomes examined included same-admission mortality and length of stay (los).

Results

Of 28,455 patients, 82.4% underwent opensx, and 17.6%, lapsx. The use of lapsx increased to 34% in 2014 from 5.9% in 2004 (p < 0.0001). Same-admission mortality was lower among patients undergoing lapsx than among those undergoing opensx (1.08% and 1.95% respectively, p < 0.0001). On multivariable analysis, the odds of same-admission mortality with lapsx was 36% lower than that with opensx (odds ratio: 0.64; p = 0.003). Median los was shorter after lapsx than after opensx (5 days and 8 days respectively, p = 0.0001). The strong association of lapsx with shorter los was maintained on multivariable analysis controlling for patient, surgeon, and hospital factors.

Conclusions

For patients with rectal cancer, shorter los and decreased same-admission mortality are associated with the use of lapsx compared with opensx.

Optical evaluation: the crux for effective management of colorectal neoplasia

Advances in minimally invasive tissue resection techniques now allow for the majority of early colorectal neoplasia to be managed endoscopically. To optimize their respective risk-benefit profiles, and, therefore, appropriately select between endoscopic mucosal resection, endoscopic submucosal dissection, and surgery, the endoscopist must accurately predict the risk of submucosal invasive cancer and estimate depth of invasion. Herein, we discuss the evidence and our approach for optical evaluation of large (⩾ 20 mm) colorectal laterally spreading lesions.

Transanal Total Mesorectal Excision: Description of the Technique

Surgery remains the gold standard for the treatment of locally advanced rectal cancer. The most effective approach to reduce locoregional recurrence is total mesorectal excision (TME). However, obtaining an optimal TME is demanding, especially in low rectal tumors and anatomically unfavorable pelvis. Transanal TME (taTME) was developed to facilitate low pelvis dissection and potentially provide optimal outcomes for oncologic resection. Current studies have reported satisfactory short-term outcomes. However, taTME is a technically challenging procedure and must be learned in an appropriate training process to allow for a safe implementation. Previous experience in laparoscopic and transanal surgery is strongly recommended. In this work, we provide a detailed discussion of the technique, based on the realization of more than 400 taTME interventions.

Comparison of Minimally Invasive Versus Open Pancreatoduodenectomy for Pancreatic Ductal Adenocarcinoma: A Propensity Score Matching Analysis

Background: Few studies have compared perioperative and oncological outcomes between minimally invasive pancreatoduodenectomy (MIPD) and open pancreatoduodenectomy (OPD) for pancreatic ductal adenocarcinoma (PDAC). Methods: A retrospective review of patients undergoing MIPD and OPD for PDAC from January 2011 to December 2017 was performed. Perioperative, oncological, and survival outcomes were analyzed before and after propensity score matching (PSM). Results: Data from 1048 patients were evaluated (76 MIPD, 972 OPD). After PSM, 73 patients undergoing MIPD were matched with 219 patients undergoing OPD. Operation times were longer for MIPD than OPD (392 vs. 327 min, p < 0.001). Postoperative hospital stays were shorter for MIPD patients than OPD patients (12.4 vs. 14.2 days, p = 0.040). The rate of overall complications and postoperative pancreatic fistula did not differ between the two groups. Adjuvant treatment rates were higher following MIPD (80.8% vs. 59.8%, p = 0.002). With the exception of perineural invasion, no differences were seen between the two groups in pathological outcomes. The median overall survival and disease-free survival rates did not differ between the groups. Conclusions: MIPD showed shorter postoperative hospital stays and comparable perioperative and oncological outcomes to OPD for selected PDAC patients. Future randomized studies will be required to validate these findings.

Endoscopic mucosal resection is effective for laterally spreading lesions at the anorectal junction

OBJECTIVE

The optimal approach for removing large laterally spreading lesions at the anorectal junction (ARJ-LSLs) is unknown. Endoscopic mucosal resection (EMR) is a definitive therapy for colorectal LSLs. It is unclear whether it is an effective modality for ARJ-LSLs.

DESIGN

EMR outcomes for ARJ-LSLs (distal margin of ≤20 mm from the dentate line) in comparison with rectal LSLs (distal margin of >20 mm from the dentate line) were evaluated within a multicentre observational cohort of LSLs of ≥20 mm. Technical success was defined as the removal of all polypoid tissue during index EMR. Safety was evaluated by the frequencies of intraprocedural bleeding, delayed bleeding, deep mural injury (DMI) and delayed perforation. Long-term efficacy was evaluated by the absence of recurrence (either endoscopic or histologic) at surveillance colonoscopy (SC).

RESULTS

Between July 2008 and August 2019, 100 ARJ-LSLs and 313 rectal LSLs underwent EMR. ARJ-LSL median size was 40 mm (IQR 35-60 mm). Median follow-up at SC4 was 54 months (IQR 33-83 months). Technical success was 98%. Cancer was present in three (3%). Recurrence occurred in 15.4%, 6.8%, 3.7% and 0% at SC1-SC4, respectively. Among 30 ARJ-LSLs that received margin thermal ablation, no recurrence was identified at SC1 (0.0% vs 25.0%, p=0.002). Technical success, recurrence and adverse events were not different between groups, except for DMI (ARJ-LSLs 0% vs rectal LSLs 4.5%, p=0.027).

CONCLUSION

EMR is an effective technique for ARJ-LSLs and should be considered a first-line resection modality for the majority of these lesions.

Association between surgical approach and survival following resection of abdominopelvic malignancies

BACKGROUND AND OBJECTIVES

Recent studies demonstrating decreased survival following minimally invasive surgery (MIS) for cervical cancer have generated concern regarding oncologic efficacy of MIS. Our objective was to evaluate the association between surgical approach and 5-year survival following resection of abdominopelvic malignancies.

METHODS

Patients with stage I or II adenocarcinoma of the prostate, colon, rectum, and stage IA2 or IB1 cervical cancer from 2010-2015 were identified from the National Cancer Data Base. The association between surgical approach and 5-year survival was assessed using propensity-score-matched cohorts. Distributions were compared using logistic regression. Hazard ratio for death was estimated using Cox proportional-hazard models.

RESULTS

The rate of deaths at 5 years was 3.4% following radical prostatectomy, 22.9% following colectomy, 18.6% following proctectomy, and 6.8% following radical hysterectomy. Open surgery was associated with worse survival following radical prostatectomy (HR, 1.18; 95% CI, 1.05-1.33; P = .005), colectomy (HR, 1.45; 95% CI, 1.39-1.51; P < .001), and proctectomy (HR, 1.28; 95% CI, 1.10-1.50; P = .002); however, open surgery was associated with improved survival following radical hysterectomy (HR, 0.61; 95% CI, 0.44-0.82; P = .003).

CONCLUSIONS

These results suggest that MIS is an acceptable approach in selected patients with prostate, colon, and rectal cancers, while concerns regarding MIS resection of cervical cancer appear warranted.

Evidence according to Cochrane Systematic Reviews on Alterable Risk Factors for Anastomotic Leakage in Colorectal Surgery

Anastomotic leakage reflects a major problem in visceral surgery, leading to increased morbidity, mortality, and costs. This review is aimed at evaluating and summarizing risk factors for colorectal anastomotic leakage. A generalized discussion first introduces risk factors beginning with nonalterable factors. Focus is then brought to alterable impact factors on colorectal anastomoses, utilizing Cochrane systematic reviews assessed via systemic literature search of the Cochrane Central Register of Controlled Trials and Medline until May 2019. Seventeen meta-anaylses covering 20 factors were identified. Thereof, 7 factors were preoperative, 10 intraoperative, and 3 postoperative. Three factors significantly reduced the incidence of anastomotic leaks: high (versus low) surgeon's operative volume (RR = 0.68), stapled (versus handsewn) ileocolic anastomosis (RR = 0.41), and a diverting ostomy in anterior resection for rectal carcinoma (RR = 0.32). Discussion of all alterable factors is made in the setting of the pre-, intra-, and postoperative influencers, with the only significant preoperative risk modifier being a high colorectal volume surgeon and the only significant intraoperative factors being utilizing staples in ileocolic anastomoses and a diverting ostomy in rectal anastomoses. There were no measured postoperative alterable factors affecting anastomotic integrity.

Oncological adequacy of laparoscopic rectal cancer resection: An audit in Indian perspective

Background:

Laparoscopic resection for rectal cancer (LRR) has gained popularity because of better short-term outcomes and less post-operative morbidity. However, LRR is still not endorsed as a standard of care mainly due to concerns centred on oncological safety in comparison with open approach. Moreover, two recent randomised trials (Australian Laparoscopic Cancer of the Rectum [ALaCaRT] and the American College of Surgeons Oncology Group [ACOSOG] Z6051) have failed to prove that LRR is non-inferior to open resection. Studies on oncological adequacy of LRR in the Indian population in terms of quality of mesorectal excision are scarce. In this article, we aim to audit the oncological adequacy of LRR in our centre and thereby critically analyse the reliability of extrapolation of results of ALaCaRT and ACOSOG trials to the Indian population.

Methods:

We retrospectively analysed the oncological adequacy of LRR in terms of completeness of total mesorectal excision (TME), distal and circumferential resection margin (CRM) status and nodal harvest in patients with rectal cancer who underwent LRR between January 2016 and June 2018 at our centre.

Results:

Of 157 patients included in this study, a complete TME was achieved in 148 (94.26%) patients and nearly complete in 7 (4.46%) patients. A safe CRM (≥1 mm) was obtained in 151 (96.18%) patients. Distal margin results were negative in 155 (98.73%) patients. Average nodal harvest was 19.86 ± 9.28. Overall surgical success, calculated as a composite measure of negative distal margin and negative CRM and complete TME was 95.54%.

Conclusion:

Good quality rectal cancer resection can be achieved by experienced laparoscopic surgeons without compromising oncological safety.

[Oral antibiotic prophylaxis for bowel decontamination before elective colorectal surgery : Current body of evidence and recommendations]

Despite a growing body of evidence from randomized controlled studies, register data and meta-analyses, there is an ongoing controversy about decontamination of the digestive tract before elective colorectal surgery. Currently, mechanical bowel preparation alone can no longer be recommended as there is a lack of evidence for an advantage in terms of risk reduction for infectious complications, anastomotic leakage, morbidity and mortality. In contrast, the administration of oral antibiotics in addition to the obligatory intravenous single shot antibiotic prophylaxis has shown an additive reduction of the risk of up to 50% for the occurrence of postoperative infectious complications; however, due to a lack of data it is unclear if mechanical bowel preparation could even improve the positive effects of combined intravenous and oral antibiotics. Therefore, further studies are necessary. At the current time the occurrence of anastomotic leakage cannot be prevented, independent of whether preoperative bowel decontamination is performed.

Teaching robotic rectal cancer surgery at your workplace: does the presence of visiting surgeons in the operating room have a detrimental effect on outcomes?

BACKGROUND

Surgery demonstration (SD) is considered to be a mainstay of surgical education, but controversy exists concerning the patient's safety. Indeed, the presence of visiting surgeons is a source of distraction and may have an impact on surgeon's performance. This study's objective was to evaluate possible differences in outcomes between robotic sphincter-saving rectal cancer surgery (RRCS) performed during routine surgical practice versus in the presence of visiting surgeons in the operating room (OR) with direct access to the surgeon.

METHODS

Retrospective case-matched studies were conducted from a prospectively collected database. 114 patients (38 with the presence of visiting surgeons) who underwent RRCS between January 2013 and September 2018 were included. Patients were matched in a 1:2 basis after propensity score analysis using five criteria: gender, body mass index, preoperative chemoradiation, type of mesorectum excision, and synchronous liver metastasis.

RESULTS

There was no difference between the two groups with regard to mean operating time, estimated blood loss, conversion, and hospital stay. Also, overall (44% vs. 40%; P = 0.6), major morbidity (26% vs. 19%; P = 0.5), and unplanned reoperation (17% vs. 15%; P = 1.0) rates were not statistically different. No difference was noted with regard to the quality of mesorectum excision, or positive rate of circumferential and distal longitudinal resection margins. The mean number of harvested lymph nodes (17 vs. 14.5; P = 0.04) was lower in the SD group and the number of patients with < 12 harvested lymph nodes (31% vs. 16%; P = 0.09) was greater after SD although it did not reach statistical significance. No differences were observed in disease-free or overall survival.

CONCLUSIONS

The presence of visiting surgeons in the OR seems not to interfere in the quality of rectal resection and does not compromise patient's short-term outcome and survival. However, mild differences in the extent of lymphadenectomy were observed and the surgeons performing SD may be aware of this.

Individual participant data pooled-analysis of risk factors for recurrence after neoadjuvant radiotherapy and transanal local excision of rectal cancer: the PARTTLE study

BACKGROUND

An organ-preserving strategy may be a valid alternative in the treatment of selected patients with rectal cancer after neoadjuvant radiotherapy. Preoperative assessment of the risk for tumor recurrence is a key component of surgical planning. The aim of the present study was to increase the current knowledge on the risk factors for tumor recurrence.

METHODS

The present study included individual participant data of published studies on rectal cancer surgery. The literature was reviewed according to according to Preferred Reporting Items for Systematic Reviews and Meta-Analyses of Individual Participant Data checklist (PRISMA-IPD) guidelines. Series of patients, whose data were collected prospectively, having neoadjuvant radiotherapy followed by transanal local excision for rectal cancer were reviewed. Three independent series of univariate/multivariate binary logistic regression models were estimated for the risk of local, systemic and overall recurrence, respectively.

RESULTS

We identified 15 studies, and 7 centers provided individual data on 517 patients. The multivariate analysis showed higher local and overall recurrences for ypT3 stage (OR 4.79; 95% CI 2.25-10.16 and OR 6.43 95% CI 3.33-12.42), tumor size after radiotherapy > 10 mm (OR 5.86 95% CI 2.33-14.74 and OR 3.14 95% CI 1.68-5.87), and lack of combined chemotherapy (OR 3.68 95% CI 1.78-7.62 and OR 2.09 95% CI 1.10-3.97), while ypT3 was the only factor correlated with systemic recurrence (OR 5.93). The analysis of survival curves shows that the overall survival is associated with ypT and not with cT.

CONCLUSIONS

Local excision should be offered with caution after neoadjuvant chemoradiotherapy to selected patients with rectal cancers, who achieved a good response to neoadjuvant chemoradiotherapy.

Standardised approach to laparoscopic total mesorectal excision for rectal cancer: a prospective multi-centre analysis

PURPOSE

Two non-inferiority randomised control trials have questioned the utility of laparoscopic surgery for rectal cancer by failing to prove that pathological markers of high-quality surgery are equivalent to those achieved by open technique. We present short- and long-term post-operative outcomes from the largest single surgeon series of consecutive patients undergoing laparoscopic TME for rectal cancer. We describe the standardised laparoscopic technique developed by the principal surgeon, and the short-term outcomes from three surgeons who were trained in and subsequently adopted the same approach.

METHODS

Prospectively acquired data from consecutive patients undergoing surgery for rectal cancer by the principal surgeon at the minimally invasive colorectal unit in Portsmouth between 2006 and 2014 were analysed along with data acquired between 2010 and 2017 from surgeons at three further international centres. Endpoints were overall and disease-free survival at 5 years, and early post-operative clinical and pathological outcomes.

RESULTS

Two hundred sixty-three consecutive patients underwent laparoscopic TME surgery by the principal surgeon. At 5 years, overall survival was 82.9% (Dukes' A = 94.4%; B = 81.6%; C = 73.7%); disease-free survival was 84.0% (Dukes' A = 93.3%; B = 86.8%; C = 72.6%). Post-operative length of stay, lymph node harvest, mean operating time, rate of conversion, major morbidity and 30-day mortality were not significantly different between the principal surgeon and those he had trained when subsequently in independent practices.

CONCLUSION

Laparoscopic TME produces excellent long-term survival outcomes for patients with rectal cancer. A standardised approach has the potential to improve outcomes by setting benchmarks for surgical quality, and providing a step-by-step method for surgical training.

The incidence, associated factors, and predictive nomogram for early death in stage IV colorectal cancer

PURPOSE

The purpose of the present study was to investigate the incidence and associated factors for early death in stage IV colorectal cancer (CRC) and to construct the predictive nomogram.

METHODS

Patients with stage IV CRC, who had been diagnosed between 2010 and 2014 in the Surveillance, Epidemiology, and End Results datasets, were eligible for this retrospective cohort study. The univariable and multivariable logistic regression models were conducted to determine the associated factors for early death (survival time ≤ 3 months). The predictive nomogram was constructed and the internal validation was performed.

RESULTS

Ten thousand two hundred sixty-three out of 36,461 (28.1%) eligible patients resulted in all causes of early death (25.8% for cancer-specific early death and 2.3% for non-cancer early death). Advanced age, marital status, right colon, poor differentiation, higher N stage, and bone metastasis were positively associated with all causes of early death, cancer-specific early death, and non-cancer early death, while higher T stage, positive carcinoembryonic antigen, and distant metastases (bone, lung, liver, and brain) were only positively associated with all causes of early death and cancer-specific early death. The calibration curve for all causes of early death, cancer-specific early death, and non-cancer early death showed the prediction curve closely approximated at the 45° line and the areas under the curve were 75.7% (95% CI, 74.9-76.4%), 75.9% (95% CI, 75.1-76.6%), and 76.9% (95% CI, 76.3-77.6%), respectively.

CONCLUSIONS

The nomogram was calibrated to predict all causes of early death development, cancer-specific early death development, and non-cancer early death development. These findings can be utilized in early screening and to tailor targeted treatment regimens for stage IV CRC patients.

Clinical application of laparoscopic total mesorectal excision using the intersphincteric approach through the sacrococcygeal incision for treating patients with rectal cancer

Introduction

Colorectal cancer is the third most common cancer causing death in Western countries; laparoscopic surgery for colorectal cancer has many advantages and thus has been used widely. Laparoscopic total mesorectal excision through the sacrococcygeal incision under direct visualization to excise distal rectal cancer is an important procedure for super-low rectal carcinomas.

Aim

To investigate the feasibility of mesorectal excision and super-low rectal carcinoma excision using the intersphincteric approach through the sacrococcygeal incision.

Material and methods

From December 2009 to June 2017, intersphincteric resection was performed through the sacrococcygeal incision; the mesentery was excised in 27 patients with rectal cancer and a contracted pelvis (the lower edge of the tumor was 4 to 7 cm to the anal verge) through laparoscopy in the Gastrointestinal Surgery Department of our hospital.

Results

No death was recorded during surgery. The surgical time ranged from 190 to 310 min, the bleeding volume was 50 to 150 ml, and the post-surgical length of stay was 6 to 19 days. There were three cases of anastomotic fistulas, one case of anastomotic stenosis, and one case of fecal incontinence. Follow-up visits were scheduled for 19 patients, with a mean time of 37 months, ranging from 3 to 92 months; one case of local recurrence, one case of peritoneal metastasis, and two cases of hepatic metastasis were observed.

Conclusions

Laparoscopic total mesorectal excision using the intersphincteric approach through the sacrococcygeal incision is feasible for treating patients with a contracted pelvis and super-low rectal carcinoma.

Simultaneous Colon and Liver Laparoscopic Resection for Colorectal Cancer with Synchronous Liver Metastases: A Single Center Experience

Background: The one-stage approach for colorectal cancer (CRC) with synchronous liver metastases (SLM) has demonstrated advantages, when feasible, in terms of oncological radicality and reduction in sanitary costs. The simultaneous laparoscopic approach to both colon cancer and liver metastases joins the advantages of mini-invasiveness to the one-stage approach. Methods: During the period from February 2011 to July 2017, a single surgeon performed 17 laparoscopic colorectal operations with simultaneous liver resection for CRC with SLM. Colorectal procedures included 9 rectal resections, 6 left colectomies, and 2 right colectomies. Associated hepatic resections included 1 left hepatectomy, 1 right posterior sectionectomy, 2 segmentectomies, and 13 wedge resections. We analyzed retrospectively the patient's short-term outcome and operative and oncologic results. Results: There was no conversion to open surgery. Six patients (35%) had minor complications (Clavien-Dindo grade I-II), whereas only 2 patients (12%) had major complications (Clavien-Dindo grade III-IV) and no mortality occurred. The median time of discharge was 8.6 (range 5-36) days. We obtained 94% of R0 resection margin on the liver specimen and 100% of negative distal and circumferential margin in case of rectal resection. An average of 20 lymphnodes were retrieved in the colorectal specimen. Conclusions: Simultaneous mini-invasive colorectal and liver resection is a challenging but feasible procedure. The advantages of treating primary cancer and metastases in the same recovery justify the morbidity rate, especially because the most of the complications are minor and no cases of mortality occurred. Further experience is needed to better understand how to reduce the morbidity rate.

Long-term results after elective laparoscopic surgery for colorectal cancer in octogenarians

BACKGROUND

The aim of this study was to investigate the short- and long-term outcomes after elective laparoscopic surgery (LPS) for colorectal cancer patients over 80 years of age.

METHODS

This was a retrospective study of all patients of 80 and above, who underwent elective colorectal resection, between January 2007 and January 2016. Data were analysed from a prospectively collected cancer database and cross checked with patient records. Determinants of survival were analysed using log-rank test and Kaplan-Meier curves.

RESULTS

We identified 293 patients; 110 underwent LPS. LPS had significantly better overall survival (p = 0.0065) and disease-free survival (DFS) (p = 0.006). The LPS group also had a shorter length of stay (LOS)-9 vs 11 days (p < 0.00001), 90-day mortality-5.5 vs 13.7% (p = 0.03) and required fewer blood transfusions 22.7 vs 40.4% (p = 0.002), when compared to open surgery (OPS). There was no difference in 30-day mortality 1.8 vs 4.9% (p = 0.22), anastomotic leakage 2.3 vs 6% (p = 0.20) or post-operative complication rates 44.5 vs 50.8% (p = 0.30).

CONCLUSIONS

LPS for patients in their 80s is characterised by better overall and DFS compared to open procedures and is associated with shorter post-operative LOS, and significantly lower 90-day mortality. Patients operated on laparoscopically also required fewer post-operative blood transfusions.

Ventilatory inefficiency adversely affects outcomes and longer-term survival after planned colorectal cancer surgery

BACKGROUND

Impaired cardiorespiratory reserve is an accepted risk factor for patients having major surgery. Ventilatory inefficiency, defined by an elevated ratio of minute ventilation to carbon dioxide excretion (VE/VCO₂), and measured by cardiopulmonary exercise testing (CPET), is a pathophysiological characteristic of patients with cardiorespiratory disease. We set out to evaluate the prevalence of ventilatory inefficiency in a colorectal cancer surgical population, and its influence on surgical outcomes and long-term cancer survival.

METHODS

In this retrospective study of 1375 patients who had undergone preoperative CPET followed by colorectal cancer surgery, we used receiver operating characteristic curve analysis to identify an optimal value of VE/VCO₂ associated with 90-day mortality. Binary logistic regression was used to evaluate whether this degree of ventilatory inefficiency was independently associated with decreased survival, both after surgery and in the longer term.

RESULTS

We identified an optimal VE/VCO₂ >39 cut-off for predicting 90-day mortality; 245 patients (17.8%) had VE/VCO₂ >39, of which 138 (10% of total cohort) had no known cardiorespiratory risk factors. Ventilatory inefficiency was independently associated with death at 90-days (8.2% mortality vs 1.9%; adjusted odds ratio [OR], 4.04; 95% confidence interval [CI], 2.09-7.84), with death after unplanned critical care admission (OR=4.45; 95% CI, 1.37-14.46) and with decreased survival at 2 yr (OR=2.21; 95%, 1.49-3.28) and 5 yr (OR=2.87; 95% CI, 1.54-5.37) after surgery.

CONCLUSIONS

A significant proportion of patients having colorectal cancer surgery have ventilatory inefficiency observed on CPET, the majority of whom have no history of cardiorespiratory risk factors. This group of patients has significantly decreased survival both after surgery and in the long-term, irrespective of cancer stage. Survival might be improved by formal medical evaluation and intervention in this group.

Guidelines for Perioperative Care in Elective Colorectal Surgery: Enhanced Recovery After Surgery (ERAS®) Society Recommendations: 2018

BACKGROUND

This is the fourth updated Enhanced Recovery After Surgery (ERAS®) Society guideline presenting a consensus for optimal perioperative care in colorectal surgery and providing graded recommendations for each ERAS item within the ERAS® protocol.

METHODS

A wide database search on English literature publications was performed. Studies on each item within the protocol were selected with particular attention paid to meta-analyses, randomised controlled trials and large prospective cohorts and examined, reviewed and graded according to Grading of Recommendations, Assessment, Development and Evaluation (GRADE) system.

RESULTS

All recommendations on ERAS® protocol items are based on best available evidence; good-quality trials; meta-analyses of good-quality trials; or large cohort studies. The level of evidence for the use of each item is presented accordingly.

CONCLUSIONS

The evidence base and recommendation for items within the multimodal perioperative care pathway are presented by the ERAS® Society in this comprehensive consensus review.

Clinicopathological Factors Influencing Lymph Node Yield in Colorectal Cancer: A Retrospective Study

Many colorectal resections do not meet the minimum of 12 lymph nodes (LNs) recommended by the American Joint Committee on Cancer for accurate staging of colorectal cancer. The aim of this study was to investigate factors affecting the number of the adequate nodal yield in colorectal specimens subject to routine pathological assessment. We have retrospectively analysed the data of 2319 curatively resected colorectal cancer patients in San Raffaele Scientific Institute, Milan, between 1993 and 2017 (1259 colon cancer patients and 675 rectal cancer patients plus 385 rectal cancer patients who underwent neoadjuvant therapy). The factors influencing lymph node retrieval were subjected to uni- and multivariate analyses. Moreover, a survival analysis was carried out to verify the prognostic implications of nodal counts. The mean number of evaluated nodes was 24.08 ± 11.4, 20.34 ± 11.8, and 15.33 ± 9.64 in surgically treated right-sided colon cancer, left-sided colon cancer, and rectal tumors, respectively. More than 12 lymph nodes were reported in surgical specimens in 1094 (86.9%) cases in the colon cohort and in 425 (63%) cases in the rectal cohort, and patients who underwent neoadjuvant chemoradiation were analysed separately. On univariate analysis of the colon cancer group, higher LNs counts were associated with female sex, right colon cancer, emergency surgery, pT3-T4 diseases, higher tumor size, and resected specimen length. On multivariate analysis right colon tumors, larger mean size of tumor, length of specimen, pT3-T4 disease, and female sex were found to significantly affect lymph node retrieval. Colon cancer patients with 12 or more lymph nodes removed had a significantly better long-term survival than those with 11 or fewer nodes (P = 0.002, log-rank test). Rectal cancer patients with 12 or more lymph nodes removed approached but did not reach a statistically different survival (P = 0.055, log-rank test). Multiple tumor and patients' factors are associated with lymph node yield, but only the removal of at least 12 lymph nodes will reliably determine lymph node status.