title: Frequency of extracolonic tumors in Brazilian families with Lynch syndrome: analysis of a hereditary colorectal cancer institutional registry.
abstract: Lynch syndrome (LS) is caused by inherited germline mutations in mismatch repair (MMR) genes. It is one of the commonest forms of inherited predisposition to colorectal cancer (CRC), accounting for 2-5% of all CRC. LS is characterized by early age of onset, with a tendency for multiplicity and an increased risk for extra-colonic tumors at particular sites. In this study we have evaluated the frequency of extra-colonic tumors in 60 unrelated LS families fulfilling the Amsterdam criteria (ACI. ACII) from the Oncotree database of the Hereditary Colorectal Cancer Registry of the AC Camargo Hospital. All families' pedigree was extensively analyzed, varying from 2 to 6 generations with a total of 2,095 individuals evaluated. As expected, colorectal cancer was the most frequent tumor in the families (334 cases). We found 200 extracolonic tumors among all individuals with a higher ratio in women (123 cases) than men (77 cases). By far, breast cancer (32 cases) was the most frequent extracolonic manifestation in women followed by endometrial (20 cases) and uterine cervix cancer (20 cases). For man, prostate (16 cases) and stomach (12 cases) cancer were the most frequent extracolonic tumors. It is well know that establishing the diagnosis is challenging and requires knowledge and surveillance. Thus, recognition of individuals and families with hereditary predisposition to cancer according to clinical and molecular features, combined with intensive surveillance and management programs, can contribute substantially to improve results related to the diagnosis and characterization of LS.
authors.affiliation: Research Center of the AC Camargo Hospital, Fundação Antônio Prudente, Rua Taguá No 440, São Paulo 01508-010, Brazil. felipe.silva@accamargo.org.br
authors.forename: Felipe Carneiro
authors.initials: FC
authors.lastname: da Silva
authors.forename: Ligia Petrolini
authors.initials: LP
authors.lastname: de Oliveira
authors.forename: Erika Monteiro
authors.initials: EM
authors.lastname: Santos
authors.forename: Wilson Toshihiko
authors.initials: WT
authors.lastname: Nakagawa
authors.forename: Samuel
authors.initials: S
authors.lastname: Aguiar Junior
authors.forename: Mev Dominguez
authors.initials: MD
authors.lastname: Valentin
authors.forename: Benedito Mauro
authors.initials: BM
authors.lastname: Rossi
authors.forename: Fábio
authors.initials: F
authors.lastname: de Oliveira Ferreira
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001938:Brazil / Q000453:epidemiology; D002648:Child; D003123:Colorectal Neoplasms, Hereditary Nonpolyposis / Q000453:epidemiology* / Q000235:genetics / Q000473:pathology; D004252:DNA Mutational Analysis; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D020022:Genetic Predisposition to Disease; D005838:Genotype; D006579:Heterozygote; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics; D009369:Neoplasms / Q000453:epidemiology* / Q000235:genetics / Q000473:pathology; D016133:Polymerase Chain Reaction; D012042:Registries; D012307:Risk Factors; D055815:Young Adult
chemical_list: D004273:DNA, Neoplasm