Fecal continence following partial resection of the anal canal in distal rectal cancer: long-term results after coloanal anastomoses

Defining Anastomotic Leak and the Clinical Relevance of Leaks

Surgeons universally dread gastrointestinal anastomotic leaks, yet the precise definition is not widely agreed on despite international consensus guidelines. Likewise, leaks are not uniformly reported which makes comparisons across studies flawed. Leak rates range from 1 to 3% for ileocolonic, 0.5 to 18% for colorectal, and 5 to 19% for coloanal anastomoses. The sequelae of an anastomotic leak vary but generally correlate with the need for a change in clinical management, from minimal changes to the need for reoperation. Short- and long-term outcomes can be life-altering or life-threatening. Temporary or permanent stomas may be necessary and low pelvic anastomotic leaks may affect bowel function. For cancer patients, leaks can delay treatment and negatively affect oncologic outcomes. In Crohn's patients, leaks are associated with higher recurrence rates. In essence, the lack of agreement on the definition of an anastomotic leak inhibits meaningful understand of its epidemiology, prevention, and treatment.

Implantation of human adipose-derived stromal cells for the functional recovery of a murine heat-damaged muscle model

In cases of lower rectum-located tumor or severe disease, surgical resection is currently the effective management; however, it also carries increased risks of function loss. The interdisciplinary field of regenerative medicine offers strategies that can potentially restore severely diseased and injured tissues and organs. Adipose-derived stromal cells (ASCs) are an abundant and accessible source of adult stem cells and hold great promise as therapeutic agents for tissue regeneration. In this work, we transplanted cells isolated from human stromal tissues, including a 6%-7% ASC population, into heat-damaged femoral muscles of non-obese diabetic immunodeficient mice. The movement of the limbs was observed to determine the functional recovery 3 months after transplantation. Among the mice that did not receive cell transplantation, 20% were able to walk with the injured limb touching the ground, while all of the mice in the ASC-treatment group were able to walk. Furthermore, all ASC-treated mice were able to stand on both back paws, in contrast to the control group mice. The human stromal cell population containing ASCs was able to differentiate and engraft the injured muscle tissues successfully. Our results indicate that stromal material/ASC-based therapies are a promising strategy for the regeneration of tissues and function restoration after severe injury due to surgery.

Intersphincteric resection for low rectal cancer: the risk is functional rather than oncological. A 25-year experience from Bordeaux

AIM

There are few data evaluating the long-term outcomes of intersphincteric resection (ISR), especially the impact of inclusion of more juxtapositioned and intra-anal tumours on oncological and functional outcomes. We compared the oncological and functional results of patients treated by total mesorectal excision and ISR for low rectal cancer over a 25-year period.

METHOD

This is a retrospective study from a single institution evaluating results of ISR over three periods: 1990-1998, 1999-2006 and 2007-2014. Patients treated by partial or total ISR, with or without neoadjuvant chemoradiotherapy, for low rectal cancer (≤ 6 cm from the anal verge) were included. We compared postoperative morbidity, quality of surgery and oncological and functional outcomes in the time periods studied.

RESULTS

Of 813 patients operated on for low rectal cancer, 303 had ISR. Tumour stage did not differ; however, the distance of the tumour from the anorectal junction decreased from 1 to 0 cm (P < 0.001) and the distal resection margin shortened from 25 to 10 mm (P < 0.001) from 1990 to 2014. The postoperative morbidity and quality of surgery did not change significantly over time. The 5-year local recurrence (4.3% vs 5.9% vs 3.5%; P = 0.741) and disease-free survival (72% vs 71% vs 75%; P = 0.918) did not differ between the three time periods. Functional results improved during the last period; however, overall 42% of patients experienced major bowel dysfunction.

CONCLUSION

Pushing the envelope of sphincter-saving resection in ultra-low rectal cancer reaching or invading the anal sphincter did not compromise oncological and functional outcomes. The main limitation of the ISR procedure appears to be functional rather than oncological, suggesting that bowel rehabilitation programmes should be developed.

Study of anorectal dynamics in patients undergoing laparoscopic ultra-low resection and transanal intersphincteric resection for rectal cancer

BACKGROUND

Quite a few studies on anal functions after open total mesorectal excision combined with transanal intersphincteric resection (ISR) have been reported, but there is little literature on anal function after laparoscopic total mesorectal excision (LTME) combined with transanal ISR. The aim of this study was to explore the post-operative anorectal dynamic changes in ultra-low rectal cancer patients undergoing LTME combined with transanal ISR.

METHODS

The data of 26 ultra-low rectal cancer patients undergoing LTME + transanal ISR were analysed. A total of 30 patients undergoing laparoscopic low anterior resection by the same surgeons during the same period were randomly enrolled into the control group.

RESULTS

There were no differences in the preoperative anorectal manometry data and Wexner anal function scores between the observation group and the control group (P > 0.05). There were no significant differences in the mean operation time, the mean amount of bleeding and the mean post-operative hospital stay between the two groups (P > 0.05). The mean follow-up time was 16 months. No recurrence and metastasis were found in all cases. At 3 and 6 months after the operation, there were significant differences in the anorectal manometry data and Wexner anal function scores between the two groups (P < 0.05). However, at 1 year after the operation, there were no significant differences in the anorectal manometry data and Wexner anal function scores between the two groups (P > 0.05).

CONCLUSION

Laparoscopic ISR for ultra-low rectal cancer is technically feasible, but the surgical indications should be strictly defined.

Long-term assessment of anorectal function after extensive resection of the internal anal sphincter for treatment of low-lying rectal cancer near the anus

Objectives: Intersphincteric resection (ISR) for low-lying rectal cancer (LRC) may induce major problems associated with anorectal function. In this study, we assessed the severity of ISR-induced impairment in anorectal function. Methods: In total, 45 patients followed up regularly ≥2 years after diverting ileostoma closure were eligible. The patients underwent ISR (n=35) or conventional coloanal anastomosis without resection of the internal anal sphincter (IAS) (n=10) for treatment of LRC from January 2000 to December 2011. We retrospectively compared anorectal function [stool frequency, urgency, Wexner incontinence scale (WIS) score, and patient satisfaction with bowel movement habits on a visual analog scale (VAS) score] for ≥2 years after stoma closure between the two groups. Results: The median follow-up period was 4.0 years (range, 2.0-6.5 years). Of the total, 17 (48.6%) patients who underwent ISR had poor anorectal function, including two with complete incontinence. Significant differences were found between the groups in the incidence of urgency (p=0.042), WIS score (p=0.024), and defecation disorder with a WIS score of ≥10 (p=0.034) but not in stool frequency. Based on the VAS score, 45.7% of patients who underwent ISR were dissatisfied with their bowel movement habits (p=0.041). Conclusions: Extensive resection of the IAS has negative short- and long-term effects on anorectal function.

Intersphincteric Resection Pushing the Envelope for Sphincter Preservation

During the last 15 years, a significant evolution has emerged in the surgical treatment of rectal cancer and restoration of bowel continuity has been one of the main goals. For many years the treatment of distal rectal cancer would necessarily require an abdominoperineal resection and end colostomy. The surgical procedure of intersphincteric resection has been proposed to offer sphincter preservation in patients with low rectal cancer and has been legitimized if executed according to adequate oncologic criteria. This article will discuss the best indications, technical aspects, functional, and oncological outcomes of intersphicteric resection in the management of rectal cancer.

Outcomes of ultra-low anterior resection combined with or without intersphincteric resection in lower rectal cancer patients

PURPOSE

We evaluated the current practice of ultra-low anterior resection (uLAR) in patients with lower rectal cancer and compared uLARs using mostly transabdominal approach with or without intersphincteric resection (ISR).

METHODS

A total of 624 consecutive lower rectal cancer patients undergoing curative uLAR were prospectively enrolled as ISR+ vs. ISR- groups (329 vs. 295 patients) between 2005 and 2012. The ISR+ group additionally received levator-sphincter reinforcement after distal resection.

RESULTS

The circumferential resection margin (CRM) + rate (≤1 mm) was 2.1 % in the two groups. Postoperative ileus occurred more in the ISR- group than in the ISR+ group (p = 0.02). Substantial erectile dysfunction occurred 1.8 times more frequently in the ISR- group than in the ISR+ group (32 vs. 18.1 %; p = 0.01) among male patients at 2 years postoperatively. The urge to defecate volume and maximal tolerance volume, closely correlated with maximal squeezing pressure and/or mean resting pressure, did not differ between patients with and without chemoradiotherapy until 24 months postoperatively. Nevertheless, the urge to defecate volume was lesser in the ISR- group than in the ISR+ group at 24 months postoperatively (p = 0.022). For 301 patients in which >5 years had elapsed postoperatively, the mean 5-year local recurrence rate was 4.3 %, and the 5-year disease-free and overall survival rates were 78.9 and 92 %, respectively, without differences between the two groups.

CONCLUSIONS

Compared with uLAR without ISR, the transabdominal ISR with levator-sphincter reinforcement provides a safe resection plane with competent CRM, concurrently reduces substantial complications, and marginally promotes recovery of neorectal function.

Risk factors for bowel dysfunction after sphincter-preserving rectal cancer surgery: a prospective study using the Memorial Sloan Kettering Cancer Center bowel function instrument

BACKGROUND

Until recently, no studies have prospectively evaluated bowel function after sphincter-preserving surgery for rectal cancer with the use of a validated bowel function scoring system.

OBJECTIVE

The aim of this study was to investigate possible risk factors for altered bowel function after sphincter-preserving surgery.

DESIGN

This was a prospective study.

SETTINGS

The study was conducted between January 2006 and May 2012 at the authors' institution.

PATIENTS

Patients who underwent sphincter-preserving rectal cancer surgery were recruited.

MAIN OUTCOME MEASURES

Bowel function was assessed 1 day before (baseline) and at 1 year after sphincter-preserving surgery or temporary ileostomy takedown with the use of the Memorial Sloan Kettering Cancer Center questionnaire. Multivariable analysis was performed to identify the factors associated with altered bowel function after surgery.

RESULTS

Overall, 266 patients were eligible for the analysis. The tumor was located in the upper, middle, and lower rectum in 68 (25.5%), 113 (42.5%), and 85 (32.0%) patients. Intersphincteric resection and temporary ileostomy were performed in 18 (6.8%) and 129 (48.5%) patients. The mean Memorial Sloan Kettering Cancer Center score was 64.5 ± 7.6 at 1 year after sphincter-preserving surgery or temporary ileostomy takedown. The Memorial Sloan Kettering Cancer Center score decreased in 163/266 patients (61.3%) between baseline and 1 year after surgery. Tumor location (p = 0.01), operative method (p = 0.03), anastomotic type (p = 0.01), and temporary ileostomy (p = 0.01) were associated with altered bowel function after sphincter-preserving surgery in univariate analyses. In multivariable analysis, only tumor location was independently associated with impaired bowel function after sphincter-preserving rectal cancer surgery.

LIMITATIONS

This study was limited by its nonrandomized design and the lack of measurement before preoperative chemoradiotherapy.

CONCLUSION

We suggest that preoperative counseling should be implemented to inform patients of the risk of bowel dysfunction, especially in patients with lower rectal cancer, although this study cannot exclude the effect of chemoradiotherapy owing to the limitation of study.

Correlation between fecal incontinence and quality of life after low anterior resection for rectal cancer

SUMMARY Aim: The purpose of this study was to investigate the correlation between fecal incontinence and quality of life after low anterior resection and long-term follow-up. Methods: For 72 patients with coloanal or low colorectal anastomosis, the quality of life was determined by the European Organisation for Research and Treatment of Cancer (EORTC) questionnaires C-30 and CR-38. The Vaizey score was used for assessment of fecal incontinence. Results: The risk of fecal incontinence significantly increased with a lower level of anastomosis (p < 0.001). The QLQ CR-38 did not discern differences between patients. The OLQ C-30 only found significantly worse social and role function in patients with coloanal anastomosis. There was a weak correlation between fecal incontinence and quality of life only. Conclusion: Determination of quality of life by EORTC QLQ C-30 and CR-38 cannot replace measurement of functional outcome. Severity of fecal incontinence and quality of life should be determined separately for assessment of functional outcome after low anterior resection.

Evolving treatment strategies for colorectal cancer: A critical review of current therapeutic options

Management of rectal cancer has markedly evolved over the last two decades. New technologies of staging have allowed a more precise definition of tumor extension. Refinements in surgical concepts and techniques have resulted in higher rates of sphincter preservation and better functional outcome for patients with this malignancy. Although, preoperative chemoradiotherapy followed by total mesorectal excision has become the standard of care for locally advanced tumors, many controversial matters in management of rectal cancer still need to be defined. These include the feasibility of a non-surgical approach after a favorable response to neoadjuvant therapy, the ideal margins of surgical resection for sphincter preservation and the adequacy of minimally invasive techniques of tumor resection. In this article, after an extensive search in PubMed and Embase databases, we critically review the current strategies and the most debatable matters in treatment of rectal cancer.

A review on functional results of sphincter-saving surgery for rectal cancer: the anterior resection syndrome

The aim of this review is to characterize the functional results and "anterior resection syndrome" (ARS) after sphincter-saving surgery for rectal cancer. The purpose of sphincter-saving operations is to save the anal sphincters by avoiding the need for rectal abdomino-perineal resection with a permanent stoma. A variety of alternative techniques have been proposed and, today, ultra-low anterior resections of the rectum are commonplace. Inevitably rectal resections modify anorectal physiology. The backdrop of the functional asset for ultralow anterior resections is related to a small neorectal capacity with high endo-neorectal pressures that act together on a weakened sphincteric mechanism. Sometimes a defecation disorder called ARS may be induced and the patient experiences an extremely low quality of life. Impaired bowel function is usually provoked either by colonic dysmotility, neorectal reservoir dysfunction, anal sphincter damage or by a combination of these factors. Surgical technique defects can contribute to these possible causes: anastomotic ischemia, short length of the descending colon and stretching of neorectal mesentery may play a role. Unfortunately, there is no therapeutic algorithm or gold standard treatment that may be used for ARS. Nevertheless, it is rational to use conservative therapy first and then resort to surgery. Drugs, rehabilitative treatment and sacral neuromodulation may be used; after failure of conservative methods, surgical treatment can be considered.

Levator-sphincter reinforcement after ultralow anterior resection in patients with low rectal cancer: the surgical method and evaluation of anorectal physiology

PURPOSE

To determine whether ultralow anterior resection with levator-sphincter reinforcement (uLAR-LSR), which is first introduced in the current study, offers functional preservation in patients with low rectal cancer.

METHODS

We assessed the functional outcomes in 56 of 61 consecutively enrolled patients who underwent uLAR-LSR. After rectal resection, levator-sphincter reinforcement (LSR) was performed by approximation of the dissected muscles. The functional outcomes were assessed preoperatively, and then 3, 12, and 24 months postoperatively.

RESULTS

There were no significant differences in the sphincter or high-pressure zone length between the preoperative and postoperative periods in the uLAR-LSR group (P = 0.298-0.981), which indicated functional preservation by the LSR. The percentage of patients with moderate to severe incontinence (>10 using the Wexner score) was significantly decreased at 24 months as compared to 3 months postoperatively (15.7 vs, 39.6%, P < 0.001). At the limited mean follow-up of 41 months, local recurrence had been detected in one patient (1.8%).

CONCLUSION

The uLAR-LSR method is a novel technical option, which maintains the anorectal function as well as accomplishing oncological safety during a short-term evaluation.

Risk factors for fecal incontinence after intersphincteric resection for rectal cancer

BACKGROUND

Restoration of bowel continuity is a major goal after surgical treatment of rectal cancer. Intersphincteric resection allows sphincter preservation in low rectal cancer but may have poor functional results, including frequent bowel movements, urgency, and incontinence.

OBJECTIVE

This study aimed to evaluate long-term functional outcome after intersphincteric resection to identify factors predictive of good continence.

DESIGN

Descriptive observational study.

SETTING

Follow-up of surgery in tertiary care university hospital.

PATIENTS

Eligible patients were without recurrence 1 year or more after surgery for low rectal cancer.

INTERVENTION

Intersphincteric resection.

MAIN OUTCOME MEASURES

: Bowel function was assessed with a standardized questionnaire sent to patients. Functional outcome was considered as good if the Wexner score was 10 or less. Univariable and multivariable regression analyses were used to evaluate impact of age, gender, body mass index, tumor stage, tumor location, distance of the tumor from the anal verge and from the anal ring, type of surgery, colonic pouch, height of the anastomosis, pelvic sepsis, and preoperative radiotherapy on functional outcome.

RESULTS

Of 125 eligible patients, 101 responded to the questionnaire. Median follow-up was 51 (range, 13-167) months. In multivariate analyses, the only independent predictors of good continence were distance of the tumor greater than 1 cm from the anal ring (OR, 5.88; 95% CI, 1.75-19.80; P = .004) and anastomoses higher than 2 cm above the anal verge (OR, 6.59; 95% CI, 1.12-38.67; P = .037).

LIMITATIONS

The study is limited by its retrospective, observational design and potential bias due to possible differences between those who responded to the questionnaire and those who did not.

CONCLUSIONS

Patient characteristics do not appear to influence functional outcome at long-term follow-up after intersphincteric resection. The risk of fecal incontinence depends mainly on tumor level and height of the anastomosis.

Analysis of super-low anterior resection for rectal cancer from a single center

PURPOSE

The purpose of this study was to evaluate the outcome and genitourinary complications of super-low anterior resection (SLAR) followed by adjuvant radiochemotherapy in the management of patients with low rectal cancer.

METHOD

One hundred and six low rectal cancer patients managed with SLAR were analyzed retrospectively.

RESULTS

There were seven patients who failed to follow up, and the 5-year survival rate was 65.7% (65/99). There were 35 patients (35.4%) who developed distant metastases, and 12 (12.1%) had local recurrence. The local recurrence rates were 21.1% (4/19), 7.1% (2/28), 5.9% (1/17), and 0% (0/2) in the patients with tumor distance of less than or equal to 2 cm, ranging from 2.1 to 3.0, from 3.1 to 4.0, from 4.1 to 5.0, and more than 5 cm, respectively. This implied local recurrence rate increased against the distance between the lower margin of tumor and resection line. Ninety-eight of 106 rectal patients had complete data of questionnaire: 58 scored 1, 32 scored 2, 7 scored 3, and 1 score 4. This revealed that the fecal function of most patients (91.8%, 90/98) was normal or nearly normal. Twenty-four of 37 males suffered from sexual dysfunction, and among them, eight were impotent (all older than 70 years), and 29 had retrograde ejaculation. Meanwhile, seven of 35 females suffered from sexual problem, 1 had dyspareunia, seven had decreased lubrication, and one had inability to achieve orgasm.

CONCLUSIONS

SLAR followed by adjuvant radiochemotherapy can effectively control local-regional disease and can be one choice of avoiding the functional morbidity of abdominoperineal resection.

Differences in ano-neorectal physiology of ileoanal and coloanal reconstructions for restorative proctectomy

OBJECTIVE

Restorative proctectomy with straight coloanal anastomosis (CAA) and restorative proctocolectomy with ilealpouch-anal anastomosis (IPAA) are options for maintaining bowel integrity after rectal resection. The aim of this study was to compare clinical function and anorectal physiology in patients treated with CAA and IPAA.

METHOD

Three-dimensional vector-manometry and neorectal volumetry were performed in straight CAA [53 patients (34 male)] and IPAA [61 patients (39 male)] for ulcerative colitis. Function was assessed using a 14 day incontinence diary.

RESULTS

Function was similar in both groups, but neorectal compliance and threshold volumes for sensation, urge and maximum tolerated volume (MTV) were significantly higher after IPAA than after CAA. Mean pressure, vector volume and sphincter symmetry at rest were significant determinants of continence in both groups but squeeze pressure did not correlate significantly with function in either group. Threshold volume, MTV, and compliance were significantly correlated with frequency of defecation in patients with IPAA but not with CAA.

CONCLUSION

A strong consistent resting anal sphincter pressure is one determinant of continence after both IPAA and CAA. Squeeze pressures do not influence the functional result. In IPAA but not CAA, the neorectum has a reservoir function which correlates with the postoperative frequency of defaecation.

Sphincter preservation in low rectal cancer is facilitated by preoperative chemoradiation and intersphincteric dissection

OBJECTIVE

The aim of this study was to evaluate oncologic outcome in patients with locally advanced distal rectal cancer treated with preoperative chemoradiation followed by low anterior resection (LAR)/stapled coloanal anastomosis, LAR/intersphincteric dissection/hand-sewn coloanal anastomosis, or abdominoperineal resection (APR).

SUMMARY BACKGROUND DATA

Distal rectal cancer presents a surgical challenge, and the goals of treatment often include tumor eradication without sacrifice of the anal sphincters. The technique of intersphincteric resection removes the internal anal sphincter to gain additional distal rectal margin in hopes of avoiding a permanent stoma.

METHODS

We analyzed 148 patients with stage II and III rectal cancers (endorectal ultrasound staged uT3-4 and/or uN1) located < or =6 cm from the anal verge, treated by preoperative chemoradiation and total mesorectal excision from 1998 to 2004. Eighty-five patients (57%) had sphincter-preserving resection (41, LAR/stapled coloanal anastomosis; 44, LAR/intersphincteric resection/hand-sewn coloanal anastomosis); 63 patients had APR.

RESULTS

Patients undergoing APR were older, with more poorly differentiated tumors evidencing less response to chemoradiation and more likely to require extended resection. Complete resection with negative histologic margins was achieved in 92%; circumferential margins were positive in 2 (5%) of 44 in the intersphincteric resection group and 8 (13%) of 63 in the APR group. Distal margins were positive in 2 (5%) of 44 in the intersphincteric resection group. With median follow-up of 47 months, there were a total of 7 local recurrences (5%): 1, 0, and 6 in the stapled anastomosis, intersphincteric resection, and APR groups, respectively. Estimated 5-year recurrence-free survival for the stapled anastomosis, intersphincteric resection, and APR groups were 85%, 83%, and 47% respectively (P = 0.001).

CONCLUSIONS

In low rectal cancer, sphincter preservation is facilitated by a significant response to preoperative chemoradiation and intersphincteric resection, without compromise of margins or outcome. In those who have a less favorable response, abdominoperineal resection is more likely to be required and is associated with poorer outcome.

Influence of anastomosis level on defection and life quality of patients underwent sphincter preservation for rectal cancer

AIM: To examine the influence of anastomosis level on defection and quality of life in low rectal cancer using a questionnaire and anus-rectal manometry.

METHODS: We selected 160 patients who were divided into 3 groups according to the distance between anastomosis and dentate line (A: 0-1.0 cm, B: 1.0-2.0 cm, C: 2.0-3.0 cm), who received evaluation with Wexner scoring systems at 3 months and at 1 year after operation, using FIQL questionnaire for quality of life and anus-rectal vectorial manometry 1 year after operation. The normal controls were 30 healthy people without anus-rectal disease and disordered defecation.

RESULTS: Lower anastomosis level meant higher Wexner scores (10.1 vs 6.1 vs 4.1, P < 0.05) at 3 mo after operation. After 1 year of adaptation and functional exercise, the scores of three groups decreased obviously (10.1 vs 5.7, 6.1 vs 3.1, 6.1 vs2.9, all P < 0.05). However, compared with B group and C group, A group still had significantly higher scores (5.7 vs 3.1, 2.9,P < 0.05), but no differences were detected between B group and C group. As for quality of life satisfaction, three groups of patients showed no significant differences in life-style, psychological coping/behavior, depression/self-feelings and embarrassing 1 year after operation.

CONCLUSION: For the low anterior resection of rectal cancer surgery, the lower of the position of anastomosis, the worse of the function and the quality of life. For the distance between stoma and dentate line less than 1 cm, the long-term survival quality of life has also declined markedly.

Analysis of clinical factors associated with anal function after intersphincteric resection for very low rectal cancer

PURPOSE

The purpose of this study was to identify factors that have a negative impact on anal function after intersphincteric resection.

METHODS

We evaluated postoperative anal function in 96 patients with very lower rectal cancer who underwent intersphincteric resection by having patients fill out detailed questionnaires at 3, 6, 12, and 24 months after surgery. Univariate and multivariate analysis based on the Wexner incontinence score were used to identify factors associated with poor anal function after intersphincteric resection.

RESULTS

The mean Wexner score at 12 months after stoma closure was 10.0. Patients with frequent major soiling showed a Wexner score of >or=16, and this score was used as a cutoff value of poor anal function. In the univariate analysis, poor anal function was significantly associated with a greater extent of excision of the internal sphincter and with preoperative chemoradiotherapy. In the multivariate analysis, preoperative chemoradiotherapy was the only independent factor associated with poor anal function after intersphincteric resection (odds ratio=10.3; 95 percent confidence interval, 2.3-46.3, P < 0.01).

CONCLUSIONS

Preoperative chemoradiotherapy was identified as the risk factor with the greatest negative impact on anal function after intersphincteric resection, regardless of extent of excision of the internal sphincter.

Long-term results of intersphincteric resection for low rectal cancer

INTRODUCTION

In the treatment of very low rectal cancer, a distal resection margin of more than 1 cm can be obtained by partial internal sphincteric resection, allowing a sphincter preserving surgery. Thus, intersphincteric resection (ISR) has been proposed as an alternative to abdominoperineal resection for selected low rectal cancer.

OBJECTIVE

The aim of our study was to assess the morbidity, mortality, and the long-term oncologic and functional results of ISR.

METHODS

Charts of patients who had ISR between 1992 and 2004 were reviewed. Cancer-related survival and locoregional recurrence rates were calculated using the Kaplan-Meier method. Functional outcome was assessed by using a standardized gastrointestinal functional questionnaire. Incontinence was assessed by the continence score of Wexner.

RESULTS

Ninety patients (59 males, 31 females) with a tumor at a median distance of 35 mm (range, 22-52) from the anal verge had an ISR. Thirty-seven patients (41%) had preoperative radiotherapy. Histologically complete remission after neoadjuvant radiotherapy (ypT0) was observed in 7 patients (8%), 12 patients (13%) were pT1, 35 patients (39%) pT2, 32 patients (36%) pT3, and 4 patients (4%) pT4. Five patients (5.5%) had synchronous liver metastases. R0 resection was obtained in 85 patients (94.4%). The median distal resection margin on the fixed specimen was 12 mm (range, 5-35) and was positive in 1 case. The circumferential margin was positive (< or =1 mm) in 4 patients (4.4%). There was no mortality. Complication rate was 18.8%: anastomotic leakage occurred in 8 patients (8.8%) and 1 patient had an anovaginal fistula. Five patients (5.6%) underwent secondary abdominoperineal resection: 1 for positive distal margin, 1 for colonic J-pouch necrosis, and 3 for local recurrence. ONCOLOGIC RESULTS: After a median follow-up of 56.2 months (range, 13.3-168.4), local, distant, and combined recurrence occurred in 6 (6.6%), 8 (8.8%), and 2 patients, respectively. Thirteen patients (14.4%) died of cancer recurrence. Five-year overall and disease-free survival was 82% (80-97) and 75% (64-86), respectively. In univariate analysis, overall survival was significantly influenced by pTNM stage and T stage (pT 1-2 vs. 3-4: P = 0.008 and stage I-II vs. III-IV: P = 0.03). In multivariate analysis, we did not find any impact on local recurrence-free survival for the investigated prognostic variables.

FUNCTIONAL RESULTS

For a total of 83 patients the mean stool frequency was 2.3 +/- 1.3 per 24 hours. Forty-one percent of patients had stool fragmentation, one-third nocturnal defecation, 19% fecal urgency, and 36% followed low fiber diet. Thirty-four patients (41%) were fully continent, 29 patients (35%) had minor continence problems, and 20 patients (24%) were incontinent. After adjustment for age, gender, tumor level, and pTNM stage, preoperative radiotherapy was the only factor associated with a risk of fecal incontinence [OR (IC 95%) = 3.1 (1.0-9.0), P = 0.04].

CONCLUSION

In selected patients, ISR is a safe operation with good oncologic results. It achieves good functional results in 76% of patients. Functional results are significantly altered by preoperative radiotherapy.

Functional results after radiochemotherapy and total mesorectal excision for rectal cancer

BACKGROUND AND PURPOSE

The aim of this study was to prospectively define and measure evacuation and continence disorders after preoperative radiochemotherapy and total mesorectal excision (TME) for rectal cancer 1 year after surgery.

MATERIALS AND METHODS

We submitted 100 patients, who underwent neoadjuvant treatment and anterior resection with TME from 1996 to 2003, to a questionnaire on postoperative continence and evacuation. Anal sphincter function was further assessed by the Memorial Sloan-Kettering score. Factors influencing anorectal function were examined in univariate and multivariate analysis.

RESULTS

Median evacuation score was 16.12 +/- 5.12 (range 0-28). Sensation of incomplete evacuation was reported in 58% of cases, necessity to return to the bathroom <15 min in 37% and inability to evacuate completely <15 min in 35%. Median continence score was 13.7 +/- 4.79 (range 0-20). Incontinence to flatus was reported in 46% of cases. Colonic J-pouch allows better evacuation and continence. Continence was also better in absence of postoperative complications. Sphincter function resulted excellent or good in 75% of patients according to the Memorial Sloan-Kettering score.

CONCLUSIONS

The most frequent symptoms in our series are the sensation of incomplete evacuation, the incontinence to flatus, and the necessity to return to the bathroom <15 min. Colonic J-pouch warrants a better function. Postoperative complications compromise good functional results.

Saving the sphincter in rectal cancer: are we prepared to change practice?

Total mesorectal excision and preoperative radiation with or without chemotherapy has led to a reduction in local recurrence rates in patients with rectal cancer. This article examines the effect such treatment has on the rate of sphincter preservation in patients with rectal cancers close to the anal sphincter mechanism and looks at the evidence for changing clinical practice.

Oncological outcome of ultra-low coloanal anastomosis with and without intersphincteric resection for low rectal adenocarcinoma

BACKGROUND

The value of ultra-low coloanal anastomosis (CAA) for rectal cancer is dependent on the oncological and functional results. The aim of this comparative study was to evaluate the long-term oncological outcome of CAA with or without intersphincteric resection (ISR) for low-lying rectal tumours.

METHODS

The study population comprised consecutive patients with low rectal cancer who underwent CAA in a single institution between 1977 and 2004. Patients were divided into two groups according to whether or not a partial ISR had been performed. Cox multivariate models were used for survival analysis.

RESULTS

Some 278 patients underwent CAA with curative intent; 173 had ISR and 105 had CAA without ISR. Mean follow-up was 66.8 months. The 5-year actuarial rate for local recurrence, regardless of tumour stage, was 10.6 per cent in the ISR group versus 6.7 per cent for CAA alone (P = 0.405), and the 5-year actuarial overall survival rate was 86.1 and 80.0 per cent respectively (P = 0.318). Cox multivariable analysis revealed that resection of the anal canal was not a prognostic factor for local or metastatic recurrence.

CONCLUSION

Sphincter-preserving surgery appears to be oncologically adequate for very low-lying rectal tumours.

Restorative proctectomy with colon pouch-anal anastomosis by laparoscopic transanal pull-through: an available option for low rectal cancer?

BACKGROUND

There are sporadic reports, with different verdicts, of restorative proctectomy by laparoscopic transanal pull-through (LTPT) without the use of a minilaparotomy for a part of the procedure. This study aimed to explore the applicability and advantages of LTPT with colon pouch-anal anastomosis for low rectal cancer, and to evaluate the results.

METHODS

From January 2002 to July 2003, 10 of 12 patients (6 men and 4 women) undergoing a laparoscopic procedure for low rectal cancer (<6 cm from the anal verge) underwent LTPT. The mean age of these patients was 58 years. The results have been compared with those for 12 similar non-pull-through procedures performed during the same period.

RESULTS

There was no operative mortality. An anastomotic leakage and a hemorrhagic gastropathy occurred in the LTPT group. During a mean follow-up period of 18 months (range, 12-26 months), there was no local relapse. Four patients manifested moderate incontinence. No significant differences in functional outcome were observed between the LTPT and control groups.

CONCLUSION

The authors' experience supports use of the LTPT procedure with colonic pouch-anal anastomosis for selected lower rectal cancers with indications for a laparoscopic approach as an appropriate and reproducible surgical treatment.

Intersphincteric resection in patients with very low rectal cancer: a review of the Japanese experience

PURPOSE

This study was designed to evaluate the feasibility and oncologic and functional outcomes of intersphincteric resection for very low rectal cancer.

METHODS

A feasibility study was performed using 213 specimens from abdominoperineal resections of rectal cancer. Oncologic and functional outcomes were investigated in 228 patients with rectal cancer located <5 cm from the anal verge who underwent intersphincteric resection at seven institutions in Japan between 1995 and 2004.

RESULTS

Curative operations were accomplished by intersphincteric resection in 86 percent of patients who underwent abdominoperineal resection. Complete microscopic curative surgery was achieved by intersphincteric resection in 225 of 228 patients. Morbidity was 24 percent, and mortality was 0.4 percent. During the median observation time of 41 months, rate of local recurrence was 5.8 percent at three years, and five-year overall and disease-free survival rates were 91.9 percent and 83.2 percent, respectively. In 181 patients who received stoma closure, 68 percent displayed good continence, and only 7 percent showed worsened continence at 24 months after stoma closure. Patients with total intersphincteric resection displayed significantly worse continence than patients with partial or subtotal resection.

CONCLUSIONS

Curability with intersphincteric resection was verified histologically, and acceptable oncologic and functional outcomes were obtained by using these procedures in patients with very low rectal cancer. However, information on potential functional adverse effects after intersphincteric resection should be provided to patients preoperatively.

Unteres, kloakogenes Rektumviertel

The distal quarter of the rectum is derived from the cloaca and can be viewed as a specialized "sensory organ". Only the proximal three quarters of the rectum stem phylogenetically from intestinal tissues. Therefore, only this upper portion has an associated mesorectum. A significant amount of data support the notion that profound differences exist between the enterogenic, upper segments and the cloacogenic, lower segment of the rectum: 1. differing supply with blood and lymph vessels, 2. embryologic and comparative anatomic findings, 3. the central support system provided by Denonvilliers' fascia, 4. specialized innervation, 5. malformations of the continence organ, 6. findings on magnetic resonance images and histologic macro sections, 7. findings on PET-CT images, 8. the muscular wall architecture of different portions of the rectum, 9. differences in basic function (storage vs continence), 10. location of most postoperative local recurrences of rectal carcinomas, even when complete mesorectal resection was performed, since hundred years.

Technique and long-term results of intersphincteric resection for low rectal cancer

PURPOSE

Intersphincteric resection of low rectal tumors is a surgical technique extending rectal resection into the intersphincteric space. This procedure is performed by a synchronous abdominoperineal approach with mesorectal excision and excision of the entire or part of the internal sphincter. This study was designed to evaluate the long-term results of this method focused on continence function and oncologic results.

METHODS

From 1984 to 2000, a total of 121 patients were operated on. The patients were evaluated prospectively according to a detailed preoperative and postoperative program.

RESULTS

One hundred seventeen patients had rectal cancers, two had dysplastic villous adenomas, and two had carcinoid tumors. Cancers were staged according to the Dukes classification (Stage A in 41 percent, Stage B in 28 percent, and Stage C in 31 percent; median distance from the anal margin, 3 (range, 1-5) cm). Postoperative complications were: one death because of pulmonary embolism, 5.1 percent developed an anastomotic fistula, one patient had a fistula to the bladder requiring reoperation, one patient with ileus needed relaparotomy as well as one for intra-abdominal hemorrhage and a small-bowel fistula. One patient developed a fistula after closing the protective colostomy. Five patients developed late strictures of the coloanal anastomosis. After a median follow-up of 72.86 months, 5.3 percent of patients developed local recurrence. The continence status was satisfactory with 16 patients (13.7 percent) showing continence for solid stool only, and 1 patient (0.8 percent) showing episodes of incontinence. A transient problem was a high stool frequency after closure of the protective stoma.

CONCLUSIONS

Intersphincteric resection is a valuable procedure for sphincter-saving rectal surgery. We showed that this technique has satisfactory long-term results in functional and oncologic respects. An important prerequisite is a careful preoperative evaluation of local tumor spread with rectal magnetic resonance imaging excluding infiltration of the external sphincter.

Sacral neuromodulation in treatment of fecal incontinence following anterior resection and chemoradiation for rectal cancer

PURPOSE

Fecal incontinence may occur in patients who have undergone anterior resection for rectal cancer without presenting sphincter lesions. Chemoradiation may contribute to disrupting continence mechanisms. Treatment is controversial. Assessment of fecal incontinence in patients who agreed to integrate treatment for rectal cancer and treatment with sacral neuromodulation are reported.

METHODS

Fecal incontinence following preoperative chemoradiation and anterior resection for rectal cancer was evaluated in four patients. A good response was observed during the percutaneous sacral nerve evaluation test, and so permanent implant of sacral neuromodulation system was performed. Reevaluation was performed at least two months after implant.

RESULTS

After device implantation, the mean fecal incontinence scores decreased, and the mean number of incontinence episodes dropped from 12.0 to 2.5 per week (P < 0.05). Permanent implant resulted in a significant improvement in fecal continence in three patients, and incontinence was slightly reduced in the fourth. Manometric parameters agreed with clinical results: maximum and mean resting tone and the squeeze pressure were normal in three patients and reduced in one. In these same three patients, neorectal sensation parameters increased when the preoperative value was normal or below normal and decreased when the preoperative value was higher than normal, whereas in one patient in whom extremely low values were recorded all of the parameters decreased significantly.

CONCLUSIONS

Fecal incontinence following anterior resection and neoadjuvant therapy should be carefully evaluated. If a suspected neurogenic pathogenesis is confirmed, sacral neuromodulation may be proposed. If the test results are positive, permanent implant is advisable. Failure of this approach does not exclude the use of other, more aggressive treatment.

Sphincter-saving resection for all rectal carcinomas: the end of the 2-cm distal rule

OBJECTIVE

To assess oncologic outcome of patients treated by conservative radical surgery for tumors below 5 cm from the anal verge.

SUMMARY BACKGROUND DATA

Standard surgical treatment of low rectal cancer below 5 cm from the anal verge is abdominoperineal resection.

METHODS

From 1990 to 2003, patients with a nonfixed rectal carcinoma at 4.5 cm or less from the anal verge and without external sphincter infiltration underwent conservative surgery. Surgery included total mesorectal excision with intersphincteric resection, that is, removal of the internal sphincter, to achieve adequate distal margin. Patients with T3 disease or internal sphincter infiltration received preoperative radiotherapy.

RESULTS

Ninety-two patients with a tumor at 3 (range 1.5-4.5) cm from the anal verge underwent conservative surgery. There was no mortality and morbidity was 27%. The rate of complete microscopic resection (R0) was 89%, with 98% negative distal margin and 89% negative circumferential margin. In 58 patients with a follow-up of more than 24 months, the rate of local recurrence was 2% and the 5-year overall and disease-free survival were 81% and 70%, respectively.

CONCLUSIONS

The technique of intersphincteric resection permits us to achieve conservative surgery in patients with a tumor close to or in the anal canal without compromising local control and survival. Tumor distance from the anal verge is no longer a limit for sphincter-saving resection.

Long-term functional results after sphincter-saving resection for rectal cancer

INTRODUCTION

A number of patients suffer from gastrointestinal side effects following sphincter-saving resection of the rectum. The aim of this study was to assess frequency and risk factors of long-term gastrointestinal side effects after sphincter-saving resection for rectal cancer.

PATIENTS AND METHODS

Between 1980 and 1997, among 209 patients treated for rectal cancer by rectal resection and sphincter conservation, 145 who were alive without recurrence or colostomy, responded to a questionnaire. There were 85 males and 60 females with a mean age of 64 Years; the follow-up was 5.4 Years. The functional result was considered good if the number of stools per 24h was three or less with normal continence and poor if the number of stools was four or more or if fecal incontinence was present. Influence of age, gender, anastomotic height, type of sutured colon, colonic pouch, defunctioning stoma, leakage, stenosis, radiotherapy, history of irritable bowel syndrome and follow-up were analyzed.

RESULTS

The mean anastomotic height was 5 cm from the anal margin. Functional results were good in 56% of patients and poor in 44%. Univariate analysis showed three variables to be significantly associated with the functional results: anastomotic height (P=0.001), radiotherapy (P=0.03) and follow-up > 24 Months (P=0.009). Multivariate analysis showed that only anastomotic height independently influenced functional results. They were good in 76%, 53% and 35% of patients for anastomoses located above 6 cm, between 6 and 3 cm, and below 3 cm from the anal margin, respectively.

CONCLUSION

After sphincter-saving resection for rectal cancer, about half of patients have poor long-term functional results, the latter being related only to the anastomotic height. This suggests the need to preserve a small part of the rectum when oncologically feasible.

[Surgical therapy of rectal carcinoma]

Total mesorectal excision (TME) has gained a revolutionary impact on the surgical therapy of rectal cancer within the last 2 decades, providing superior local tumor control in comparison to conventional resection. Consequently, 85% of rectal carcinomas can be resected by sphincter-preserving surgery without compromising either oncologic radicality or continence. With the introduction of TME, local recurrence rates have been reliably decreased below 10% after curative resection. Surgical dissection along the connective tissue space between rectal and parietal pelvic fascia with complete mesorectal excision results in reliable excision of all relevant lymphatic pathways with preservation of continence and sexual function. Complete removal of a TME specimen is mandatory in carcinomas of the middle and lower third of the rectum. Both removal of the complete TME specimen and careful pathologic examination of the circumferential resection margin have decisive significance. An additional pelvic lymphadenectomy with the potential risk of increased morbidity does not improve prognosis. As a spread of tumor distally along the bowel wall rarely exceeds a few centimeters, a distal resection margin of 1-2 cm is oncologically sufficient in sphincter-saving procedures without compromising prognosis. Taken together, the convincing results of TME provide a rationale for using TME as the dissection policy of choice to resect rectal cancers in the distal two-thirds of the rectum, despite the absence of direct evidence from prospective randomized trials. The question whether laparoscopic curative resection for rectal cancer is oncologically adequate cannot be definitely answered to date, as results of randomized studies are currently missing. However, the preliminary results of laparoscopic resection for rectal cancer provided by centers are promising.

Preoperative parameters expanding the indication of sphincter preserving surgery in patients with advanced low rectal cancer

OBJECTIVE

To clarify the preoperative parameters of the required distal margin that can be applied to the criteria of sphincter-preserving surgery in rectal cancer.

SUMMARY BACKGROUND DATA

Although aggressive sphincter-preserving surgery, including intersphincteric resection, is beginning to be applied to low rectal tumors, unexpected distal cancer spread might undermine local control in patients undergoing such a procedure. The 'two-centimeter rule' of distal clearance is predominant at present, whereas preoperative criteria to determine the individual required distal margin have not yet been established.

METHODS

First, by reviewing 556 rectal cancers, promising risk parameters of intramural distal spread (IM) were selected and, subsequently, such parameters were examined in regard to whether they could be evaluated preoperatively. Furthermore, 80 patients with lower rectal cancers located above the anal canal who were undergoing abdominoperineal resection were reviewed as to whether IM risk factors could be used as criteria to identify the low rectal cancer with or without anal canal involvement.

RESULTS

IM was observed in 10.6% (IM >or= 10 mm: 2.3%) of the patients examined, and the incidence was higher in tumors with certain unfavorable histologic characteristics, including tumor "budding," in their submucosal region at the distal edge (24.4%) than in those with no such histology (5.3%). Regarding such unfavorable histology as IM risk factor, together with 3/4 or more annularity and type 3 gross appearance, IM rates were 3.3% (IM >or= 10 mm: 0.5%) in the no-risk group, 9.1% (IM >or= 10 mm: 1.7%) in the one-risk group, and 29.1% (IM >or= 10mm: 7.8%) in the multiple-risks group. These results were reproduced well even if such risk factors were evaluated endoscopically or histologically on preoperative biopsy specimens. Furthermore, no anal canal involvement was observed in 32 tumors without IM risk; however, microscopic cancer spread down to the anal canal, including that into outside of the internal sphincter muscle, was observed in 9.1% of tumors with one IM risk and in 26.7% of multiple-risk tumors.

CONCLUSIONS

The preoperative evaluation of particular parameters related to IM enabled the accurate selection of rectal cancer to which the one-centimeter rule of distal clearance can be applied. This could allow us to expand the indication of sphincter preservation for very low rectal cancer patients.

Ultralow anterior resection with intersphincteric dissection--what is the limit of safe sphincter preservation?

INTRODUCTION

In the treatment of low rectal cancer, the possibility of sphincter preserving surgery is increased by partial sphincteric resection which may allow an oncologically safe resection margin in some patients who would traditionally have been treated by abdominoperineal resection. The aim of this study is to evaluate the morbidity, mortality and the oncological and functional results of intersphincteric resection to determine whether the technique may be considered a safe means of sphincter preservation.

METHODS

Between May 1992 and December 1999, 26 patients (mean age 55 years, range 28-82) with adenocarcinoma of the rectum had partial sphincteric resection by an abdominal approach with a colonic J-pouch anal anastomosis. The mean distance between the tumour and the anal verge 4.25 (range 3.1-5.25) cm. Four tumours were T1, 14 T2 (3 N+), 7 T3 (3 N+), and 1 T4 (N+). Neoadjuvant radiotherapy was used in 10 patients. The distal resection margin was positive in one patient who then proceeded to safe abdominoperineal resection (APR). In the remaining patient the mean distal resection margin on the fixed specimen was 1.6 (range 0.3-3.5) cm.

RESULTS

There were no deaths. Morbidity was 30% with an anastomotic leak rate of 11%. At mean follow-up of 39 (range 11-93) months the local recurrence rate was 3.4%. Functional results were evaluated in 25 patients at mean follow-up of 27 (8-66) months: 65% had 0-2 bowel motions per 24 h, 31% had 3-5 and 4% between 6 and 9. Nine patients (36%) had nocturnal defecation. Continence was normal in 50% with 23% reporting incontinence to gas and 27% reporting minor episodes of incontinence. None had major incontinence and 85% considered their outcome satisfactory.

CONCLUSION

This study supports the current literature indicating that partial sphincteric resection is an oncologically and functionally safe alternative to abdominoperineal resection for some selected low rectal tumours.

Options for sphincter preservation in surgery for low rectal cancer

BACKGROUND

Abdominoperineal excision of the rectum with a permanent end-sigmoid colostomy was the classical operation for cancer of the distal third of the rectum. A number of factors have recently led to a more conservative approach, allowing sphincter preservation when excising tumours that are not invading the anal sphincter.

METHODS

The review is based on the published literature of the treatment of low rectal cancers accessed by searching Medline and other online databases. It includes a description of all the surgical options currently available for low rectal tumours, and a discussion of the advantages and disadvantages of the types of anastomosis and reconstruction.

RESULTS AND CONCLUSION

It is now technically possible to remove rectal cancer that is extending into the anal canal with preservation of the anal sphincter mechanism and with a satisfactory oncological outcome. Ultra-low colorectal and coloanal anastomosis, together with a colonic pouch or coloplasty, produces acceptable function in many patients. However, there is still controversy about the risk of tumour implantation, the place of downsizing neoadjuvant therapy, and true long-term functional outcome. Despite these concerns, surgeons should strive to perform rectal resection with sphincter preservation for low-lying rectal cancer whenever possible.

Methods and results of sphincter-preserving surgery for rectal cancer

BACKGROUND

Sphincter preservation is the goal in the treatment of rectal cancer and should be considered in all patients with an intact sphincter. Sphincter preservation for tumors of the upper rectum is easily achieved, but surgical management of cancer of the mid and lower third of the rectum continues to evolve. Several recent advances may influence future treatment strategies.

METHODS

We reviewed the literature to identify the current methods of sphincter-preserving surgery and their oncologic and functional results.

RESULTS

Proctectomy with total mesorectal excision reduces the incidence of local recurrence to less than 10% while preserving genitourinary function. The use of preoperative radiotherapy may further diminish the risk of local recurrence. In selected patients, partial resection of the anal sphincter may avoid definitive colostomy without compromising oncologic outcome. In contrast, the role of local resection of rectal cancer remains controversial. Restoration of continuity by means of a colonic reservoir reduces stool frequency and urgency and improves continence when compared to a straight coloanal anastomosis. The transverse colpoplasty pouch may allow pouch construction in patients in whom it is currently impossible, but long-term follow-up is not yet available.

CONCLUSIONS

Sphincter-preserving surgery is possible for the majority of patients with rectal cancer. Optimal functional results may be obtained by a nerve-sparing operative technique and by use of a colonic reservoir for reconstruction following resection of mid or low rectal cancers.

Pouch reconstruction in the pelvis

ILEAL POUCH RECONSTRUCTION: Proctocolectomy with ileal pouch-anal anastomosis (IPAA) is the procedure of choice in mucosal ulcerative colitis (MUC) and familial adenomatous polyposis (FAP). Because the disease is cured by surgical resection, functional results, pouch survival prognosis, and disease or dysplasia control are the major determinants of success. There is controversy as to whether the IPAA should be handsewn with mucosectomy or stapled, preserving the mucosa of the anal transitional zone. Crohn's disease is a contraindication for IPAA, but long-term outcome after IPAA is similar to that for MUC in patients with indeterminate colitis who do not develop Crohn's disease. As development of dysplasia and cancer in the ileal pouch have been reported, a standardized surveillance program is mandatory in cases of MUC, FAP, and chronic pouchitis. COLONIC POUCH RECONSTRUCTION: Construction of a colonic pouch is a widely accepted technique to improve functional outcome after low or intersphincteric resection for rectal cancer. Several randomized studies comparing colo-pouch-anal anastomosis (CPA) with straight coloanal anastomosis (CAA) have found the pouch functionally superior. Most controlled studies cover only 1-year follow-up, but randomized studies with 2-year follow-up show similar functional results of CPA and CAA. Evacuation difficulty as initially observed was related to pouch size, and the results with smaller pouches (5-6 cm) are more favorable, showing adequate reservoir function without compromising neorectal evacuation. The transverse coloplasty pouch may offer several advantages to J-pouch reconstruction. Current series question whether the neorectal reservoir is the physiological key of the pouch, but rather the decreased motility. The major advantage reported with colonic pouch reconstruction is the lower incidence of anastomotic complications.

Preoperative radiochemotherapy and sphincter-saving resection for T3 carcinomas of the lower third of the rectum

OBJECTIVE

To evaluate the complications and oncologic and functional results of preoperative radiochemotherapy and sphincter-saving resection for T3 cancers of the lower third of the rectum.

SUMMARY BACKGROUND DATA

Carcinomas of the lower third of the rectum (i.e., located at or below 6 cm from the anal verge) are usually treated by abdominoperineal resection, especially for T3 lesions. Few data are available evaluating concomitant chemotherapy with preoperative radiotherapy for increasing sphincter-saving resection in low rectal cancer.

METHODS

Between 1995 and 1999, 43 patients underwent preoperative radiochemotherapy with conservative surgery for a low rectal tumor located a mean of 4.5 cm from the anal verge (range 2-6); 70% of the lesions were less than 2 cm from the anal sphincter. There were 40 T3 and 3 T4 tumors. Patients received preoperative radiotherapy with a mean dose of 50 Gy (range 40-54) and concomitant chemotherapy with 5-FU in continuous infusion (n = 36) or bolus (n = 7). Sphincter- saving resection was performed 6 weeks after treatment, in 25 patients by using intersphincteric resection. Coloanal anastomoses were associated with a colonic pouch in 86% of the patients, and all patients had a protecting stoma.

RESULTS

There were no deaths related to preoperative radiochemotherapy and surgery. Acute toxicity was mainly due to diarrhea, with 54% of grade 1 to 2. Four anastomotic fistulas and two pelvic hematomas occurred; all patients but one had closure of the stoma. Distal and radial surgical margins were respectively 23 +/- 8 mm (range 10-40) and 8 +/- 4 mm (range 1-20) and were negative in 98% of the patients. Downstaging (pT0-2N0) was observed in 42% of the patients (18/43) and was associated with a greater radial margin (10 vs. 6 mm; P =.02). After a median follow-up of 30 months, the rate of local recurrence was 2% (1/43), and four patients had distal metastases. Overall and disease-free survival rates were both 85% at 3 years. Functional results were good (Kirwan continence I, II) in 79% of the available patients (n = 37). They were slightly altered by intersphincteric resection (57 vs. 75% of perfect continence; NS) but were significantly improved by a colonic pouch (74 vs. 16%; P =.01).

CONCLUSIONS

These results suggest that preoperative radiochemotherapy allowed sphincter-saving resection to be performed with good local control and good functional results in patients with T3 low rectal cancers that would have required abdominoperineal resection in most instances.

Colonic J-pouch function in rectal cancer patients: impact of adjuvant chemoradiotherapy

PURPOSE

The colonic J-pouch technique of reconstruction optimizes functional outcome after proctectomy with coloanal anastomosis. However, the impact of adjuvant chemoradiation therapy on pouch function in rectal cancer patients has not been investigated.

METHODS

From January 1994 to December 1999, 74 patients with midrectal or low rectal tumors (less than 10 cm from the anal verge) underwent a proctectomy with coloanal anastomosis with colonic J-pouch reconstruction. Chemoradiation was offered in patients with Stage II and III disease. Radiation therapy was administered using a four-field technique including the anal canal, for a total dose of 50.4 Gy (1.8 Gy/fraction/day). Fifteen patients (20 percent) died with metastatic disease, five (6.8 percent) died of other causes without evidence of recurrence, and five (6.8 percent) were lost to follow-up. In addition, two patients had local recurrence (2.7 percent) at the time of follow-up. Forty-five of 47 eligible patients (96 percent) responded to a questionnaire designed to evaluate specifically the degree of continence and pouch evacuation.

RESULTS

The mean age of patients was 68.9 (range, 42-88) years and the mean duration of follow-up was 28.8 (range, 1-69) months. There were 28 patients in the surgery alone group and 17 patients who received either preoperative (13) or postoperative (4) adjuvant chemoradiation therapy. Patients in the surgery alone group had a significantly better degree of continence (mean +/- standard deviation continence score: 18.1 +/- 2.9 vs. 13.3 +/- 4.1, P < 0.001) and were less likely to experience evacuatory problems (mean +/- standard deviation evacuation score: 21.3 +/- 3.7 vs. 16.4 +/- 3.5, P < 0.001). Use of a pad was more frequent in the chemoradiation therapy than in the surgery alone group (53 vs. 18 percent, P = 0.02). The incidence after functional disorders was also more frequent in the irradiated group of patients: incontinence to gas (76 vs. 43 percent, P = 0.03), to liquid stool (64 vs. 25 percent, P = 0.01), and to solid stool (47 vs. 11 percent, P = 0.01). Moreover, irradiated patients reported more frequent pouch-related specific problems, such as clustering (82 vs. 32 percent, P = 0.001), and sensation of incomplete evacuation (82 vs. 32 percent, P = 0.001). Finally, regression analysis demonstrated that radiation-induced sphincter dysfunction was progressive over time.

CONCLUSIONS

Both preoperative and postoperative chemoradiation therapy adversely affects continence and evacuation in patients with colonic J-pouch. Because radiation-induced damage to the normal tissues is known to be cumulative over time, long-term progressive dysfunction of the anal sphincter and neorectum are causes of concern. Consideration should be given to excluding the anal canal from the field of irradiation in patients with Stage II and III rectal cancer, whenever a sphincter-preserving procedure is planned.

Preservation of rectal function after low anterior resection with formation of a neorectum

Recent advances in surgery have enabled low rectal cancers to be resected, while at the same time restoring bowel continuity and preserving the anal sphincter. Although a permanent stoma is avoided and the operation is oncologically sound, function may be compromised. Many patients with a straight coloanal anstomosis suffer from urgency, incontinence, and bowel frequency-the so-called anterior resection syndrome. Over the last 15 years, surgical developments have aimed at improving function after restoration of bowel continuity, essentially by creating a neorectum. The best known and most widely practiced operation involves formation of a colonic J-pouch. The physiological and functional outcomes of the colonic J-pouch are discussed, along with controversies surrounding construction. Although a J-pouch improves some aspects of function, the results are not perfect. Alternatives to the colonic J-pouch are appraised, indicating future areas of development.

[Conservative treatment of adenocarcinomas of the anorectal junction by preoperative radiotherapy and intersphincteral resection]

AIM

Adenocarcinomas of the anorectal junction, especially T3 lesions, are usually treated by abdominoperineal resection. The aim of this study was to evaluate oncologic and functional results following conservative radiosurgical treatment of cancers of the anorectal junction.

METHODS

From 1990 to 1999, among 395 patients with rectal carcinoma, 31 had sphincter-saving resection for a tumour located between 2 to 4.5 cm (mean 3.6) from the anal verge. There were 16 men and 15 women, mean age 62 years (range 30-86). There were 5 T2, 23 T3 and 3 T4 tumours; 17 were N1 and 3 were M1. Preoperative radiotherapy was performed in 26 patients (dose: 46 Gy, range: 36-54), with concomitant chemotherapy in 14 cases. Intersphincteric resection was performed six weeks after neoadjuvant treatment. Coloanal anastomoses were associated with a colonic pouch in 22 cases and with a protecting stoma in all cases.

RESULTS

There was no postoperative mortality. Seven complications occurred: 3 anastomotic fistulas, 3 pelvic haemorrhages and 1 acute pancreatitis. Three patients had a definitive stoma. After preoperative radiotherapy, down-staging (pT0-2 N0) occurred in 46% of cases (12/26). Distal margin was 2.2 cm (range: 1-3) and was microscopically safe in all cases. Lateral margin was safe (> or = 1 mm) in 97% of cases. With a mean follow-up of 36 months, no local recurrence was suspected. Twenty-six patients (84%) were alive, 23 free of disease. Half of the patients had perfect continence, whereas the other half had occasional minor soiling. Functional results were better in patients with a colonic pouch.

CONCLUSION

Conservative treatment of carcinomas of the anorectal junction is possible without compromising pelvic control and patient survival. Pelvic control was probably achieved by using preoperative radiotherapy with intersphincteric resection, ensuring safe distal and lateral margins.