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The proportion of endometrial cancers associated with Lynch syndrome: a systematic review of the literature and meta-analysis

25/10/2019

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Author(s) Ryan N.A.J.; Crosbie E.J.; Evans D.G.; Glaire M.A.; Blake D. et al.
Source Genetics in Medicine; Oct 2019; vol. 21 (no. 10); p. 2167-2180
Purpose: Endometrial cancer (EC) is often the sentinel cancer in women with Lynch syndrome (LS). However, efforts to implement universal LS screening in EC patients have been hampered by a lack of evidence detailing the proportion of EC patients that would be expected to screen positive for LS.

Method(s): Studies were identified by electronic searches of Medline, Embase, Cochrane CENTRAL and Web of Science. Proportions of test positivity were calculated by random and fixed-effects meta-analysis models. I2 score was used to assess heterogeneity across studies.

​Result(s): Fifty-three studies, including 12,633 EC patients, met the inclusion criteria. The overall proportion of endometrial tumors with microsatellite instability or mismatch repair (MMR) deficiency by immunohistochemistry (IHC) was 0.27 (95% confidence interval [CI] 0.25-0.28, I2: 71%) and 0.26 (95% CI 0.25-0.27, I2: 88%), respectively. Of those women with abnormal tumor testing, 0.29 (95% CI 0.25-0.33, I2: 83%) had LS-associated pathogenic variants on germline testing; therefore around 3% of ECs can be attributed to LS. Preselection of EC cases did increase the proportion of germline LS diagnoses.

Conclusion(s): The current study suggests that prevalence of LS in EC patients is approximately 3%, similar to that of colorectal cancer patients; therefore our data support the implementation of universal EC screening for LS.Copyright © 2019, The Author(s).
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