One discussion this week included the surgical management of lynch syndrome.

Reference: DynaMed Plus [Internet]. Ipswich (MA): EBSCO Information Services. 1995 – . Record No. 115317, Lynch syndrome – Surgery and procedures; [updated 2018 Sept 26, cited 2018 Nov 16];. Emory login required. (Click on link and search for “lynch syndrome”).

Summary: Surgery considerations for Lynch syndrome patients with colorectal cancer (DynaMed Plus, 2018):

• full colectomy with ileorectal anastomosis recommended rather than segmental/partial colonic resection due to increased risk for metachronous cancers
• National Comprehensive Cancer Network (NCCN) recommends considering segmental vs. extended colectomy for colorectal adenocarcinoma based on clinical scenario, individual considerations, and discussion of risk
• European Society for Medical Oncology (ESMO) recommends discussing option of extended colectomy vs. intensive surveillance after standard surgery at time of colorectal cancer diagnosis, particularly in young patients
• American College of Gastroenterology (ACG) recommends
  • colectomy with ileorectal anastomosis as preferred treatment option for Lynch syndrome patients with colon cancer or colonic neoplasia not controllable by endoscopy
  • segmental colectomy with regular surveillance after surgery as an option in patients not suitable for total colectomy
• United States Multi-Society Task Force (USMSTF) on Colorectal Cancer recommends colectomy with ileorectal anastomosis for Lynch syndrome patients with colon cancer or colorectal neoplasia not removable by endoscopy
• segmental colectomy may increase risk of metachronous colorectal cancer compared to extended colectomy in patients with Lynch syndrome
  • based on systematic review of observational studies
  • systematic review of 6 observational studies comparing segmental vs. extended colectomy in 871 patients with Lynch syndrome being treated for colorectal cancer
  • 705 patients (81%) had segmental colectomy and 166 patients (19%) had extended colectomy
  • mean follow-up 91 months
  • 161 patients (22.8%) receiving segmental colectomy and 10 patients (6%) receiving extended colectomy had metachronous colorectal cancer during mean follow-up of 91 months
  • compared to extended colectomy, segmental colectomy associated with increased metachronous colorectal cancer in analysis of 5 studies with 792 patients
    • odds ratio 4.02, 95% CI 2.01-8.04
    • NNH 3-18 with metachronous colorectal cancer in 6% of extended colectomy group
  • adverse events not reported