Multiple epithelial and nonepithelial tumors in hereditary nonpolyposis colorectal cancer: Characterization of germline and somatic mutations of the MSH2 gene and heterogeneity of replication error phenotypes

Rui-Lan Huang, Chung Faye Chao, Dah Ching Ding, Cheng Ping Yu, Cheng Chang Chang, Hung Chen Lai, Mu Hsien Yu, Hang Seng Liu, Tang Yuan Chu

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Hereditary nonpolyposis colorectal cancer (HNPCC) is an autosomal inherited cancer syndrome characterized by germline plus somatic mutations of DNA mismatch repair genes and familial clustering of cancers of colorectum and other visceral organs. So far, to our knowledge, there has been no proof of nonepithelial tumors in association with HNPCC. Here we report on a MSH2 frameshift HNPCC family with a carrier found to have multiple primary tumors, including endometrial hyperplasia, ovarian adenocarcinoma, skin cavernous hemangioma, and skin dermatofibrosarcoma protuberans (DFSP). We studied the replication error (RER) phenotype in noncoding (Bat-26, Bat-25, D2S123, D5S346, and D17S250) and coding (MSH3, MSH6, BAX, and TGFBR2 genes) DNA sequences, and characterized the germline and somatic mutations of the MSH2 gene in the tumors described above and in endometrial carcinomas from two of her affected siblings. RER was observed in an order of hyperplasic endometrium (6/10 markers), ovarian carcinoma (5/10 markers), endometrial carcinomas (4/9 and 3/10), DFSP (2/9 markers), and cavernous hemangioma (2/10 markers). All the tumors showed the same germline mutation of G5→G6 frameshift at 183-187 and polymorphism of C1168T in a heterozygous pattern. In an endometrial carcinoma, deletion of the second allele of MSH2 was evident. Heterogeneous RER patterns were noted in multiple primary tumors of the same individual and in premalignant and malignant endometrial tumors from different individuals. The study demonstrated the two hits of the hMSH2 gene as well as intra- and interindividual variations of RER phenotypes in HNPCC. The first characterized nonepithelial tumors in HNPCC seem to carry a limited panel of RER, including a framesift at the (A)10 tract of TGFBR2.

Original languageEnglish
Pages (from-to)108-114
Number of pages7
JournalCancer Genetics and Cytogenetics
Volume153
Issue number2
DOIs
Publication statusPublished - Sep 2004
Externally publishedYes

ASJC Scopus subject areas

  • Cancer Research
  • Genetics
  • Molecular Biology

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