Perez-Rodriguez A, Sarasola E, Perez de Nanclares G, Sagasta A. [Familial endometrial adenocarcinoma: MSH6 variant of unknown significance in the presence of phenocopy, what should be done?].
Rev Esp Patol 2022;
55 Suppl 1:S16-S20. [PMID:
36075656 DOI:
10.1016/j.patol.2020.02.006]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 01/29/2020] [Accepted: 02/16/2020] [Indexed: 06/15/2023]
Abstract
Endometrial cancer (EC) is the second most common tumor in women with Lynch syndrome, and can be its first manifestation. It may exhibit negative immunostaining for DNA mismatch-repair proteins and/or microsatellite instability. We present the case of a woman with EC in which a MSH6 variant of unknown significance was identified. To establish the pathogenicity of the variant, the family study was extended, identifying her healthy sister as a carrier while her aunt, with EC, was not. In the latter, the histopathology of a first tumor block did not identify the pathway of carcinogenesis, but its repetition in a second tumor block suggested the possibility of it being a phenocopy. The multidisciplinary approach in the study of this family allowed a correct diagnosis of the different adenocarcinomas, adequate family genetic counselling and the correct assignment of pathogenicity to a variant in MSH6.
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