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Mutations in the RAS‐MAPK, PI(3)K (phosphatidylinositol‐3‐OH kinase) signaling network correlate with poor survival in a population‐based series of colon cancers
Author(s) -
Barault Ludovic,
Veyrie Nicolas,
Jooste Valerie,
Lecorre Delphine,
Chapusot Caroline,
Ferraz JeanMarc,
Lièvre Astrid,
Cortet Marion,
Bouvier AnneMarie,
Rat Patrick,
Roignot Patrick,
Faivre Jean,
LaurentPuig Pierre,
Piard Francoise
Publication year - 2008
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.23388
Subject(s) - kras , microsatellite instability , mutation , colorectal cancer , proportional hazards model , population , biology , survival analysis , mapk/erk pathway , carcinogenesis , cancer research , medicine , oncology , allele , cancer , gene , genetics , signal transduction , microsatellite , environmental health
The RAS‐MAPK, PI (3)K signaling pathways form a network that play a central role in tumorigenesis. The BRAF , KRAS and PI3KCA genes code 3 partners of this network and have been found to be activated by mutation in colorectal cancer; these mutations lead to unrestricted cell growth. We evaluated the clinicopathological features and the prognosis of patients with activated‐network colon cancers in a population‐based study. A total of 586 colon adenocarcinomas were evaluated using sequencing for mutations of KRAS and PI3KCA , and allelic discrimination for mutation of BRAF . Clinicopathological characteristics were correlated to the risk of bearing a mutation of the network using logistic regression. Three‐year survival rates were compared with the Log rank test. A multivariate survival analysis using the Cox model was performed. After adjustment for age and microsatellite instability, activation of the network by mutation of at least 1 of the 3 genes was significantly associated with female sex ( p = 0.02) and proximal location ( p < 0.001). Lower levels of 3‐year survival were associated with activation of the network by mutation of at least 1 of the 3 genes (59.4 and 69.4%, respectively; p = 0.009). These results remained significant in a multivariate analysis adjusted for sex, age, location, stage and microsatellite instability (HR = 1.48; CI CI 95% = [1.07–2.04]). Our study is the first report to underline the potential role of RAS‐MAPK, PI (3)K network mutations on survival in colon cancers. Because of the role of this signaling network on anticancer agents, the evaluation of its mutations could have clinical implications. © 2008 Wiley‐Liss, Inc.