title: Clonal heterogeneity in human esophageal squamous cell carcinomas on DNA analysis.
abstract: Cancers are thought to arise through multistep accumulation of somatic mutations in the progeny of a single cell. Multiple mutations may induce molecular intratumor heterogeneity. Therefore, we examined molecular clonal heterogeneity in esophageal squamous cell carcinomas. Twenty-four esophageal squamous cell carcinomas and associated lymph node metastases were examined for microsatellite alterations, and abnormalities of the p53 and transforming growth factor-beta type II receptor (TGF-beta RII) genes. There were eight cases (33%) showing different patterns of loss of heterozygosity in primary tumors and metastatic lymph nodes with microsatellite markers. On the other hand, the abnormalities of p53 were identical in all these cases. No mutation was detected in the simple repeated sequences of the TGF-beta RII gene. These results indicate that molecular clonal heterogeneity exists in esophageal squamous cell carcinomas. Therefore, care is necessary in preoperative genetic diagnosis using biopsy samples.
authors.affiliation: First Department of Surgery, Tokyo Medical and Dental University School of Medicine, Bunkyo-ku.
authors.forename: H
authors.initials: H
authors.lastname: Hori
authors.forename: S
authors.initials: S
authors.lastname: Miyake
authors.forename: Y
authors.initials: Y
authors.lastname: Akiyama
authors.forename: M
authors.initials: M
authors.lastname: Endo
authors.forename: Y
authors.initials: Y
authors.lastname: Yuasa
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000473:pathology; D002999:Clone Cells; D004273:DNA, Neoplasm / Q000235:genetics*; D004276:DNA, Satellite / Q000235:genetics; D004938:Esophageal Neoplasms / Q000235:genetics* / Q000473:pathology; D017353:Gene Deletion; D016158:Genes, p53; D006579:Heterozygote; D006801:Humans; D008207:Lymphatic Metastasis; D009154:Mutation; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D017346:Protein Serine-Threonine Kinases; D000077294:Receptor, Transforming Growth Factor-beta Type II; D018125:Receptors, Transforming Growth Factor beta / Q000235:genetics
chemical_list: D004273:DNA, Neoplasm; D004276:DNA, Satellite; D018125:Receptors, Transforming Growth Factor beta; D017346:Protein Serine-Threonine Kinases; D000077294:Receptor, Transforming Growth Factor-beta Type II