Abstract
Lynch syndrome (LS) is the most common of the hereditary colorectal cancer (CRC) syndromes, accounting for 3–6% of CRC. Individuals with LS also have significantly increased risks for endometrial, ovarian, gastric, and other cancers, including high rates of synchronous and metachronous CRC diagnosed at an earlier age (LS accounts for 8% of CRC diagnosed before the age of 50) because of an accelerated carcinogenetic process, from normal mucosa to adenoma to carcinoma, requiring early (beginning at age 20–25) and more frequent (every 1–2 years) screening/surveillance colonoscopy. The early age of diagnosis combined with the propensity for the development of metachronous CRC and other organ cancers has forced a re-evaluation of surgical dogma regarding segmental resection as the routine, conventional operation performed for CRC presenting in LS patients. Previous systematic reviews of segmental versus extended colectomy in LS patients, while acknowledging limited data, concluded that segmental resection is the standard of care. However, given the increased interest and published literature on the subject, including several studies revealing a statistically significant increase in metachronous CRC in LS patients who underwent segmental versus extended colectomy as the initial operation for CRC (especially in the past decade), there is enough accumulated evidence to now make a rational, informed decision on the best operation for LS patients who develop CRC. Table 9.2 provides striking evidence from 5 continents to support extended or subtotal/total colectomy as the operation of choice for LS patients who develop CRC. The final decision, including length of large bowel remnant left, may be tailored to limit potential postoperative bowel dysfunction such as urgency, frequency, and fecal incontinence. Extended colectomy (subtotal/total abdominal colectomy) has increased support in the literature and is preferred for younger patients, under the age of 60–65 years, with good sphincter function. All patients will still require close endoscopic observation of their residual large bowel remnant and surveillance of other at-risk organs, regardless of the extent of colectomy.
The only other organs to consider for prophylactic resection are the reproductive organs of women, as accurate screening for reproductive organ cancer is questionable and prophylactic surgical removal reliably eliminates the risk of cancer. Therefore, prophylactic removal of the reproductive organs is recommended for women who have completed childbearing or who do not wish to preserve fertility, regardless of age.
Current evidence supports extended colectomy for the young, healthy, and continent patient combined with prophylactic reproductive organ removal for women who have completed or are not considering childbearing. The decision regarding extended or subtotal/total colectomy along with prophylactic reproductive organ removal for women should be discussed and resolved in concert with other surgical specialists (gynecologic oncologists), together with the LS patient who faces the uncertainty and anxiety associated with this lifelong genetic predisposition to CRC and other organ cancers.
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Conflicts of Interest
Ms. Hampel: Ms. Hampel has performed collaborative research with Ambry Genetics, InVitae Genetics, and Myriad Genetic Laboratories, Inc. (included free and discounted genetic testing for research subjects). Ms. Hampel is on the scientific advisory board for InVitae Genetics and Genome Medical. Ms. Hampel has stock in Genome Medical.
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Cirocco, W.C., Hampel, H. (2020). Lynch Syndrome: Management of the Colon, What Operation?. In: Guillem, J., Friedman, G. (eds) Management of Hereditary Colorectal Cancer. Springer, Cham. https://doi.org/10.1007/978-3-030-26234-1_9
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