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Mutation analysis of PIK3CA and PIK3CB in esophageal cancer and Barrett's esophagus
Author(s) -
Phillips Wayne A.,
Russell Sarah E.,
Ciavarella Marianne L.,
Choong David Y.H.,
Montgomery Karen G.,
Smith Katherine,
Pearson Richard B.,
Thomas Robert J.S.,
Campbell Ian G.
Publication year - 2006
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.21706
Subject(s) - esophagus , esophageal cancer , exon , mutation , adenocarcinoma , biology , somatic cell , cancer research , germline mutation , single strand conformation polymorphism , cancer , microbiology and biotechnology , gene , genetics , anatomy
Mutation of PIK3CA , the gene coding for the p110α catalytic subunit of phosphoinositide 3‐kinase (PI3K), has been reported in a limited range of human tumors. We now report that PIK3CA is also mutated in esophageal tumors. Single‐strand conformational polymorphism (SSCP) and denaturing high‐performance liquid chromatography (DHPLC) were used to screen all 20 exons of PIK3CA in 101 samples from 95 individuals with esophageal cancer and/or Barrett's esophagus. Somatic mutation of PIK3CA was detected in 4 of 35 (11.8%) of esophageal squamous cell carcinomas (SCC) and 3 of 50 (6%) adenocarcinomas. No mutations were detected in any of 17 samples of Barrett's esophagus. For PIK3CB , we screened exons 11 and 22, which code for the regions corresponding to the exon 9 and 20 mutational ‘hotspots’ of PIK3CA . No somatic changes were detected in PIK3CB This study extends previous observations in other tumor types by demonstrating the presence of somatic PIK3CA mutations in both SCC and adenocarcinoma of the esophagus, thus implicating the PI3K pathway in the initiation and/or progression of esophageal cancers. © 2005 Wiley‐Liss, Inc.