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PIK3CA gene alterations in bladder cancer are frequent and associate with reduced recurrence in non‐muscle invasive tumors
Author(s) -
Dueñas Marta,
MartínezFernández Mónica,
GarcíaEscudero Ramón,
Villacampa Felipe,
Marqués Miriam,
SaizLadera Cristina,
Duarte José,
Martínez Victor,
Gómez Mª José,
Martín Mª Luisa,
Fernández Manoli,
Castellano Daniel,
Real Francisco X.,
RodriguezPeralto Jose L.,
De La Rosa Federico,
Paramio Jesús M.
Publication year - 2015
Publication title -
molecular carcinogenesis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.254
H-Index - 97
eISSN - 1098-2744
pISSN - 0899-1987
DOI - 10.1002/mc.22125
Subject(s) - biology , cancer research , carcinogenesis , gene , bladder cancer , p110α , mutation , cancer , tumor progression , pi3k/akt/mtor pathway , signal transduction , genetics
Bladder cancer (BC) is the fifth most common cancer in the world, being the non‐muscle invasive tumors (NMIBC) the most frequent. NMIBC shows a very high frequency of recurrence and, in certain cases, tumor progression. The phosphatidylinositol 3‐kinase (PI3K) pathway, which controls cell growth, tumorigenesis, cell invasion and drug response, is frequently activated in numerous human cancers, including BC, in part through alterations of PIK3CA gene. However, the significance of PIK3CA gene alterations with respect to clinicopathological characteristics, and in particular tumor recurrence and progression, remains elusive. Here, we analyzed the presence of mutations in FGFR3 and PIK3CA genes and copy number alterations of PIK3CA gene in bladder tumor and their correspondent paired normal samples from 87 patients. We observed an extremely high frequency of PIK3CA gene alterations (mutations, copy gains, or both) in tumor samples, affecting primarily T1 and T2 tumors. A significant number of normal tissues also showed mutations and copy gains, being coincident with those found in the corresponding tumor sample. In low‐grade tumors PIK3CA mutations associated with FGFR3 mutations. Alterations in PIK3CA gene resulted in increased Akt activity in tumors. Interestingly, the presence of PIK3CA gene alterations, and in particular gene mutations, is significantly associated with reduced recurrence of NMIBC patients. Importantly, the presence of FGFR3 mutations may influence the clinical outcome of patients bearing alterations in PIK3CA gene, and increased recurrence was associated to FGFR3 mutated, PIK3CA wt tumors. These findings may have high relevance in terms of using PI3K‐targeted therapies for BC treatment. © 2013 Wiley Periodicals, Inc.