Rev Gastroenterol Mex. 2018 Sep 17. pii: S0375-0906(18)30160-5. doi: 10.1016/j.rgmx.2018.06.007. [Epub ahead of print]
Diagnosis and clinical behavior in patients with Lynch-like syndrome.
[Article in English, Spanish]
Adán-Merino L1, Aldeguer-Martínez M2, Alonso-Gamarra E3, Valentín-Gómez F2, Zaera-De la Fuente C2, Martín-Chávarri S2.
INTRODUCTION AND AIMS:
Lynch-like syndrome is diagnosed when there is an expression deficit in DNA mismatch repair proteins but a normal genetic study. The behavior and management of that pathology are currently a subject of debate. We present herein the characteristics of patients with Lynch-like syndrome, together with a surveillance proposal.
MATERIALS AND METHODS:
Immunohistochemistry was carried out on families suspected of presenting with Lynch syndrome. Germline analysis was done if there was loss of mismatch repair protein expression and no BRAF mutation.
Of the 148 patients that underwent immunohistochemistry testing, 23 presented with loss of mismatch repair protein expression. Seven of those patients were identified as having Lynch-like syndrome: 3had colon cancer, 2had endometrial tumor, and 2were healthy, with an affected relative. Mean patient age was 56.9 years and only one patient presented with another tumor associated with Lynch syndrome.
Until there is a better understanding of the etiology of that heterogeneous entity, intermediate surveillance is an adequate strategy.
Copyright © 2018 Asociación Mexicana de Gastroenterología. Publicado por Masson Doyma México S.A. All rights reserved.
Análisis genético; Genetic analysis; Immunohistochemistry; Inmunohistoquímica; Riesgo de cáncer; Risk for cancer; Sospecha de síndrome de Lynch; Surveillance; Suspected Lynch syndrome; Vigilancia
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