title: Microsatellite instability and expression of mismatch repair genes in sporadic endometrial cancer coexisting with colorectal or breast cancer.
abstract: The molecular background of sporadic endometrial cancer coexisting with colorectal or breast cancer is not clear. We investigated microsatellite instability (MSI) and status of mismatch repair (MMR) gene product, MLH1, MSH2 and MSH6, in 63 sporadic endometrial cancers coexisting with colorectal or breast cancer. Sixteen sporadic endometrial cancers with colorectal cancers (EC), 26 sporadic endometrial cancers with breast cancer (EB) and 21 endometrial cancers without a coexisting cancer (control) were analyzed. EC had the highest frequency of MSI among the 3 groups (EC, 69%; EB, 23%; and control, 43%). Incidence of low-frequency MSI was significantly higher in EC (38%). Among endometrial cancer cases diagnosed before age 50, all high-frequency MSI (MSI-H) cases belonged to EC. Interestingly, incidence of MSI-H was significantly higher in tamoxifen-non-treated cases (75%) than that of treated cases (14%). These results suggest that alterations in MMR genes appear to be involved in carcinogenesis of EC but seem to be uncommon in those of EB. Presence of MSI in sporadic endometrial cancer may be a useful marker to predict the risk of colorectal cancer.
authors.affiliation: Department of Biochemistry and Molecular Oncology, Graduate School, University of Tsukuba, Ibaraki 305-8575, Japan.
authors.forename: Katsumi
authors.initials: K
authors.lastname: Takano
authors.forename: Yoshihito
authors.initials: Y
authors.lastname: Ichikawa
authors.forename: Ei
authors.initials: E
authors.lastname: Ueno
authors.forename: Michitaka
authors.initials: M
authors.lastname: Ohwada
authors.forename: Mitsuaki
authors.initials: M
authors.lastname: Suzuki
authors.forename: Hajime
authors.initials: H
authors.lastname: Tsunoda
authors.forename: Masanao
authors.initials: M
authors.lastname: Miwa
authors.forename: Kazuhiko
authors.initials: K
authors.lastname: Uchida
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yoshikawa
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000368:Aged; D020137:Base Pair Mismatch; D014408:Biomarkers, Tumor / Q000235:genetics; D001943:Breast Neoplasms / Q000150:complications / Q000235:genetics*; D002352:Carrier Proteins; D043171:Chromosomal Instability / Q000235:genetics; D015179:Colorectal Neoplasms / Q000150:complications* / Q000235:genetics; D004260:DNA Repair / Q000235:genetics*; D004268:DNA-Binding Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism; D016889:Endometrial Neoplasms / Q000737:chemistry / Q000150:complications / Q000235:genetics*; D005260:Female; D015870:Gene Expression; D006801:Humans; D018895:Microsatellite Repeats / Q000235:genetics*; D008875:Middle Aged; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein; D009363:Neoplasm Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins / Q000032:analysis / Q000235:genetics / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D014408:Biomarkers, Tumor; D002352:Carrier Proteins; D004268:DNA-Binding Proteins; C094443:G-T mismatch-binding protein; C501486:MLH1 protein, human; D009363:Neoplasm Proteins; D009687:Nuclear Proteins; D011518:Proto-Oncogene Proteins; C497172:MSH2 protein, human; D000070957:MutL Protein Homolog 1; D051718:MutS Homolog 2 Protein