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Functional outcomes after transanal total mesorectal excision (TaTME): a random forest analysis to predict patients' outcomes. Tech Coloproctol 2023; 27:1037-1046. [PMID: 36871281 PMCID: PMC9985820 DOI: 10.1007/s10151-023-02775-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Accepted: 02/13/2023] [Indexed: 03/06/2023]
Abstract
PURPOSE Anorectal, sexual, and urinary dysfunction are common issues after rectal cancer surgery, although seldom explored. The primary aim of this study was to investigate postoperative anorectal functional results. METHODS Patients with mid/low-rectal cancer treated with transanal TME (TaTME) with primary anastomosis with/without diverting stoma between 2015 and 2020 were reviewed and selected if they had a minimum follow-up of 6 months (from the primary procedure or stoma reversal). Patients were interviewed using validated questionnaires and the primary outcome was bowel function based on Low Anterior Resection Syndrome (LARS) scores. Statistical analyses were performed to identify clinical/operative variables correlated with worse outcomes. A random forest (RF) algorithm was computed to classify patients at a greater risk of minor/major LARS. RESULTS Ninety-seven patients were selected out of 154 TaTME performed. Overall, 88.7% of the patients had a protective stoma and 25.8% reported major LARS at mean follow-up of 19.0 months. Statistical analyses documented that age, operative time, and interval to stoma reversal correlated with LARS outcomes. The RF analysis disclosed worse LARS symptoms in patients with longer operative time (> 295 min) and stoma reversal interval (> 5.6 months). If the interval ranged between 3 and 5.6 months, older patients (> 65 years) reported worse outcomes. Finally, no statistical difference was documented when comparing the rate of minor/major LARS in the first 27 cases versus others. CONCLUSION One-quarter of the patients developed major LARS after TaTME. An algorithm based on clinical/operative variables, such as age, operative time, and time to stoma reversal, was developed to identify categories at risk for LARS symptoms.
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Variations in the definition and perceived importance of positive resection margins in patients with colorectal cancer - an EYSAC international survey. EUROPEAN JOURNAL OF SURGICAL ONCOLOGY 2023; 49:107072. [PMID: 37722286 DOI: 10.1016/j.ejso.2023.107072] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Revised: 08/03/2023] [Accepted: 09/09/2023] [Indexed: 09/20/2023]
Abstract
INTRODUCTION Microscopically positive resection margins (R1) are associated with poorer outcomes in patients with colorectal cancer. However, different definitions of R1 margins exist. It is unclear to what extent the definitions used in everyday clinical practice differ within and between nations. This study sought to investigate variations in the definition of R1 margins in colorectal cancer and the importance of margin status in clinical decision-making. MATERIALS AND METHODS A 14-point survey was developed by members of The European Society of Surgical Oncology (ESSO) Youngs Surgeons and Alumni Club (EYSAC) Research Academy targeting all members of the multidisciplinary team (MDT) treating patients with colorectal cancer. The survey was distributed on social media, in ESSO's monthly newsletter and via national societies. RESULTS In total, 137 responses were received. Most respondents were from Europe (89.7%), with the majority from Denmark (56.9%). Less than 2/3 of respondents defined R1 margins as the presence of viable cancer cells ≤1 mm of the margin. Only 60% reported that subdivisions of R1 margins (primary tumour vs tumour deposit vs metastatic lymph node) are routinely available. More than 20% of respondents reported that pathology reports are not routinely reviewed at MDT meetings. Less than half of respondents considered margin status in decision-making for type and duration of adjuvant chemotherapy in Stage III colon cancer. CONCLUSION The definitions and perceived clinical importance of microscopically positive margins in patients with colorectal cancer appear to vary. Adoption of an international dataset for pathology reporting may help to standardise current practices.
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Immediate and long-term impact of the COVID-19 pandemic on delivery of surgical services. Br J Surg 2020; 107:1250-1261. [PMID: 32350857 PMCID: PMC7267363 DOI: 10.1002/bjs.11670] [Citation(s) in RCA: 474] [Impact Index Per Article: 118.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Accepted: 04/09/2020] [Indexed: 12/13/2022]
Abstract
Background The ongoing pandemic is having a collateral health effect on delivery of surgical care to millions of patients. Very little is known about pandemic management and effects on other services, including delivery of surgery. Methods This was a scoping review of all available literature pertaining to COVID-19 and surgery, using electronic databases, society websites, webinars and preprint repositories. Results Several perioperative guidelines have been issued within a short time. Many suggestions are contradictory and based on anecdotal data at best. As regions with the highest volume of operations per capita are being hit, an unprecedented number of operations are being cancelled or deferred. No major stakeholder seems to have considered how a pandemic deprives patients with a surgical condition of resources, with patients disproportionally affected owing to the nature of treatment (use of anaesthesia, operating rooms, protective equipment, physical invasion and need for perioperative care). No recommendations exist regarding how to reopen surgical delivery. The postpandemic evaluation and future planning should involve surgical services as an essential part to maintain appropriate surgical care for the population during an outbreak. Surgical delivery, owing to its cross-cutting nature and synergistic effects on health systems at large, needs to be built into the WHO agenda for national health planning. Conclusion Patients are being deprived of surgical access, with uncertain loss of function and risk of adverse prognosis as a collateral effect of the pandemic. Surgical services need a contingency plan for maintaining surgical care in an ongoing or postpandemic phase.
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Eras program implementation in colorectal surgery: A multi-institution study based on the “lazio network” collective database including 1200 patients over two years. Clin Nutr ESPEN 2019. [DOI: 10.1016/j.clnesp.2019.03.093] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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5
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Complete pathologic response rectal cancers (CORSiCA) EYSAC.1 Study. Eur J Surg Oncol 2019. [DOI: 10.1016/j.ejso.2018.10.097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
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Management of malignant colon and rectal polyps (T1) after endoscopic polypectomy: analysis of pathological risk factors for lymph nodes metastasis. A retrospective multicentric observational study. POST-1 (Polypectomy Or Surgery for T1). Eur J Surg Oncol 2019. [DOI: 10.1016/j.ejso.2018.10.205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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3D MRI segmentation and 3D circumferential resection margin evaluation for a standard rectal cancer assessment. G Chir 2018; 39:152-157. [PMID: 29923484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
AIM Recent studies focused on rectal cancer suggested that a 3D imaging segmentation obtained from MRI data could contribute in the definition of the circumferential resection margin (CRM) and in the assessment of the tumor regression following neo-adjuvant treatments. Here, we propose a method for defining and visualizing the circumferential margins using 3D MRI segmentation; this methodology was tested in a clinical study comparing 3D CRM assessment vs standard MRI imaging. PATIENTS AND METHODS MRI scans performed before neo-adjuvant treatments were selected and reviewed. 3D mesorectal/tumor segmentations were obtained using Digital Imaging and COmmunications in Medicine (DICOM) data; CRMs were calculated using 3D volumes plus a color scale for the closest distances. RESULTS 3D reconstructions were possible in all selected cases and 3D images implemented by the color scale were positive for immediate CRM visualization. Statistical analyses comparing standard radiology disclosed that the degree of consistency, the reliability of ratings, the correlation and precision were optimal considering the overall cases, but lower in the CRM>0 mm sub-group. CONCLUSIONS This new method is not inferior comparing standard radiology; moreover, the imaging segmentation we obtained was highly promising and could be helpful in defining a standard CRM measurement, thus it could improve clinical practice.
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Long-term outcomes in ypT0 rectal cancers: An international multi-centric investigation on behalf of Italian Society of Surgical Oncology Young Board (YSICO). Eur J Surg Oncol 2017; 43:1472-1480. [PMID: 28571778 DOI: 10.1016/j.ejso.2017.04.017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 04/12/2017] [Accepted: 04/30/2017] [Indexed: 12/26/2022] Open
Abstract
AIM To investigate the outcome and pattern of survivals of rectal cancer patients presenting a complete or nearly complete tumor response after neo-adjuvant treatment. METHODS Young surgeons <40 years old affiliated to the Italian Society of Surgical Oncology (YSICO) from 13 referral centers for colorectal cancer treatment, were invited to participate a retrospective study. Records from patients treated from 2005 to 2015 with a pathological diagnosis of ypT0/ypTis were retrieved and pooled in a common data-base for statistical purposes. All clinical and pathological variables were reviewed. Univariate and multivariate analyses were conducted with the end-point of survivals. RESULTS Two hundreds and sixty-one patients were analyzed including 237 ypT0 and 24 ypTis. Nodal positive patients were 8.7%. More than sixty-six percent of the patients did not perform adjuvant chemotherapy, with a statistical difference comparing N0 versus N+ patients (66.8% vs 40.9%, p 0.02). Mean follow-up was of 47.6 months. Twenty-two relapses were observed, 91.6% at a distant site. The mean time to recurrence was of 35.3 months. On univariate analysis, the use of adjuvant chemotherapy correlated with better OS exclusively in ypT0N + patients and not in ypT0N0. Univariate and multivariate analyses documented nodal positivity as the only prognostic factor correlated with a worse OS. CONCLUSION Recurrences were mostly diagnosed at a distant site and within the third year of follow-up. Nodal positivity was the only variable independently correlated with a worse OS. Univariate analysis documented a benefit for the use of adjuvant chemotherapy treatment exclusively in ypT0N + rectal cancers.
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Expression of MIR-21 in gastric cancer: Correlation with clinical-pathological features and prognosis of gastric cancer patients. Eur J Surg Oncol 2016. [DOI: 10.1016/j.ejso.2016.04.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
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Accurate measurements of low activity for calibration of a RIA gamma counter used in red marrow dosimetry. Phys Med 2016. [DOI: 10.1016/j.ejmp.2016.01.372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Study of inter-fraction variability of absorbed dose to bone metastases and follow-up for a patient who underwent 223Ra-dichloride therapy. Phys Med 2016. [DOI: 10.1016/j.ejmp.2016.01.348] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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A multicenter dosimetric and observational study for lesion dosimetry in 223Ra therapy of bone metastases: Calibration protocol and eligibility criteria. Phys Med 2016. [DOI: 10.1016/j.ejmp.2016.01.378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Novel MRI quality assurance procedure based ON signal to noise ratio linearity. Phys Med 2016. [DOI: 10.1016/j.ejmp.2016.01.430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Surgical strategies for duodenal GISTs: Benefits and limitations of minimal resections. Eur J Surg Oncol 2015; 41:805-7. [PMID: 25911111 DOI: 10.1016/j.ejso.2015.03.232] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 03/28/2015] [Indexed: 01/26/2023] Open
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The importance of lymph node retrieval and lymph node ratio following preoperative chemoradiation of rectal cancer. Colorectal Dis 2013; 15:e382-8. [PMID: 23581854 DOI: 10.1111/codi.12242] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/22/2012] [Accepted: 02/05/2013] [Indexed: 12/13/2022]
Abstract
AIM Preoperative chemoradiation (CRT) for rectal cancer decreases the number of examined lymph nodes (NELN) found in the resected specimen. However, the prognostic role of lymph node evaluation including overall numbers and the lymph node ratio (LNR) in patients having preoperative CRT have not yet been defined. The study has assessed the influence of CRT on the NELN and on lymph node number and LNR on the survival of patients with rectal cancer. METHOD Between 2003 and 2011, 508 patients with nonmetastatic rectal cancer underwent mesorectal excision. Of these 123 (24.2%) received preoperative CRT. Univariate and multivariate analysis was performed to define the role of NELN and LNR as prognostic indicators of survival. RESULTS Neoadjuvant CRT significantly reduced the NELN (P < 0.0001). Disease-free survival (DFS) and overall survival (OS) of patients with fewer or more than 12 nodes retrieved did not differ statistically. Node-negative patients with six or fewer lymph nodes were significantly associated with a poor DFS and OS on univariate analysis (P = 0.03 and P = 0.03). LNR significantly influenced the DFS and OS on multivariate analysis [DFS, P = 0.0473, hazard ratio (HR) 2.4980, 95% confidence interval (CI) 1.2631-9.4097; OS, P = 0.0419, HR 1.1820, 95% CI 1.1812-10,710]. CONCLUSION The cut-off of 12 lymph nodes does not influence survival and should not be considered for cancer-specific prediction of patients having neoadjuvant CRT. In contrast LNR is an independent prognostic predictor of DFS and OS in such patients.
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Abstract
Micro RNAs (miRs) are small non-coding RNAs aberrantly expressed in human tumors. Here, we aim to identify miRs whose deregulated expression leads to the activation of oncogenic pathways in human gastric cancers (GCs). Thirty nine out of 123 tumoral and matched uninvolved peritumoral gastric specimens from three independent European subsets of patients were analyzed for the expression of 851 human miRs using Agilent Platform. The remaining 84 samples were used to validate miRs differentially expressed between tumoral and matched peritumoral specimens by qPCR. miR-204 falls into a group of eight miRs differentially expressed between tumoral and peritumoral samples. Downregulation of miR-204 has prognostic value and correlates with increased staining of Bcl-2 protein in tumoral specimens. Ectopic expression of miR-204 inhibited colony forming ability, migration and tumor engraftment of GC cells. miR-204 targeted Bcl-2 messenger RNA and increased responsiveness of GC cells to 5-fluorouracil and oxaliplatin treatment. Ectopic expression of Bcl-2 protein counteracted miR-204 pro-apoptotic activity in response to 5-fluorouracil. Altogether, these findings suggest that modulation of aberrant expression of miR-204, which in turn releases oncogenic Bcl-2 protein activity might hold promise for preventive and therapeutic strategies of GC.
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miRNA profiling of gastric tumors unveils tumor suppressor pathway. Eur J Surg Oncol 2012. [DOI: 10.1016/j.ejso.2012.07.041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Technology & tools development. Ann Oncol 2012. [DOI: 10.1093/annonc/mds163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Clinical-pathological features of gastrointestinal stromal tumors presenting associated with other neoplasms: a brief report. MINERVA CHIR 2012; 67:175-180. [PMID: 22487919] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
AIM Over the past 10 years, few authors reported the synchronous detection of gastrointestinal stromal tumors (GISTs) and other neoplasms in the 9-33% of GISTs series. The primary aim of the present study was of investigating the features of GISTs detected in patients with other malignancies. METHODS From 1999 to 2010 the GISTs detected at surgical exploration or preoperative assessment for other malignancies plus primary-GISTs, were recorded and reviewed. RESULTS All synchronous GISTs were positive for kit/CD34, resulting smaller in size, with a lower mitotic index and occurring in elderly patients, comparing with primary-GISTs (P<0.05). Moreover a prevalence of males and of lower-risk classifications were noted, not reaching, however, a statistical value. CONCLUSION According with our findings, the synchronous GISTs are mainly asymptomatic/incidentally detected and display some of the low malignant features; we recommend, however, the surgical excision of GISTs occurring in patients with other malignancies in order to define the histology and risk features and since it might result in an incorrect management if misdiagnosed as a metastases.
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Evaluation of E6 and E7 mRNA expression in HPV DNA positive breast cancer. EUR J GYNAECOL ONCOL 2012; 33:164-167. [PMID: 22611956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Several studies have suggested a possible role for HPV in the pathogenesis of the breast cancer. We investigated the presence of the HPV DNA in breast cancers and non malignant disease breast tissues by the use of a standard HPV detection method (INNO-Lipa HPV), in order to detect HPV DNA in metastatic nodes, to investigate a possible cervical HPV co-infection, and to evaluate the E6/E7 mRNA expression in HPV DNA positive breast cancer tissues. The rate of HPV infection was significantly higher in the cancer group than in controls (9/31 vs. 0/12, p = 0.04). One out of eight metastatic axillary nodes was positive for HPV infection; 2/3 of the positive HPV breast cancer patients were co-infected at the cervical site. The role of the virus in breast oncogenesis is still unclear, since our analysis failed in demonstrating the expression of viral E6 and E7 in positive HPV positive breast tumor tissues.
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Prognostic Implication of High Risk Human Papillomavirus E6 and E7 mRNA in Patients with Intraepithelial Lesions of the Cervix in Relationship to Age. Int J Immunopathol Pharmacol 2011; 24:461-70. [DOI: 10.1177/039463201102400219] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Since the introduction of the cytological screening programs, a significant reduction in the incidence of cervical cancer has been achieved. Almost all of these cancers are related to high-risk (HR) Human Papillomavirus (HPV) cervical infections. However, the natural history of HPV infection seems to be different in younger patients, resulting in a higher rate of regression. There is, therefore, the need to identify HPV-related biomarkers in order to enhance the effectiveness of screening of high-risk cytological lesions, in particular in women over 35 years of age. This study aims to evaluate the prognostic value of the HR HPV E6 and E7 mRNA expression in women with intraepithelial lesions of the cervix, older or younger than 35 years of age. One hundred and eighty-four HR HPV DNA positive patients with a low squamous intraepithelial lesion (LSIL) were tested for mRNA expressions, included in an observational study, and evaluated at follow-up with standard cytology up to 24 months from the mRNA test. The frequency of HSIL/LSIL cytology in the older cohort of mRNA positive patients was significantly higher compared to mRNA-negative patients, both at 1 and 2 years of follow-up ( Chi-square: p 0.007 and p 0.009), but this difference was not found in the younger cohort. According to our results, the E6/E7 mRNA test could be a biomarker for viral activity, useful in identifying patients at higher risk of abnormal cytology, and in implementing the management of HR HPV DNA-positive women over 35 years of age.
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[Mechanical microanastomosis in reconstructive surgery of the neck and face]. I SUPPLEMENTI DI TUMORI : OFFICIAL JOURNAL OF SOCIETA ITALIANA DI CANCEROLOGIA ... [ET AL.] 2005; 4:S182-3. [PMID: 16437977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Aim of the study is to report our preliminar experience with MCA Coupler System in mechanical microanastomoses performed in head and neck reconstructive surgery. During almost 7 months we performed 7 end-to-end venous anastomoses: 3 of them regarding the cephalic district. We had no vascular thrombosis, vascular congestion or flap loss. Mean time of execution of anastomosis with MCA Coupler System was 10 minutes. In our experence it is essential the choice of the appropriate size of the device and a good dissection of recipient vessels. In our opinion the Coupler System is an easy applicable device, and an efficient alternative to manual micro-anastomoses.
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[Expanders and the prosthetic short line in breast reconstruction after mastectomy: experience with the first 130 surgically treated cases]. I SUPPLEMENTI DI TUMORI : OFFICIAL JOURNAL OF SOCIETA ITALIANA DI CANCEROLOGIA ... [ET AL.] 2005; 4:S169-70. [PMID: 16437967] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Breast reconstruction as now to be consider as a complementary treatment of breast cancer surgery. Between 1998-1999 we developed a project of collaboration with Polytech-Silimed Europe Gmbh for a new textured tissue expander. This new system allows expansion of the middle and lower quadrant of the breast acting a physiologic ptosis of the breast. Authors report their experience on the first 130 patients.
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[Five hundred sixty-nine flaps used in reconstruction of the head and neck: morbidity analysis and results]. I SUPPLEMENTI DI TUMORI : OFFICIAL JOURNAL OF SOCIETA ITALIANA DI CANCEROLOGIA ... [ET AL.] 2005; 4:S186-7. [PMID: 16437979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Aim of the study is to provide high-level results in terms of functionality and softness of the tissues achieved with different reconstructive techniques performed in oncological surgery of the head and neck. Test group was composed of 528 patients recovered with a diagnosis of head and neck cancer. We performed 569 flaps: myocutaneous, cutaneous and fasciocutaneous, and free flaps. The clinical outcome and the morpho-functional evaluation show that free flaps can ensure excellent results, especially in defined anatomical areas such as the cervical-esophageal region, jaw and tongue. As to myocutaneous and cutaneous/fasciocutaneous flaps, they are still the first reconstructive choice, according to their minimal or no functional implications.
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