Association between PIK3CA alteration and prognosis of gastric cancer patients: a meta-analysis

Oncotarget
Hua LiZhibin Huo

Abstract

Increasing evidence suggests that dysregulation of phosphatidylinositol-4, 5-bisphosphate 3-kinase, catalytic subunit alpha (PIK3CA) plays an important role in carcinogenesis. However, the relationship between PIK3CA expression and gastric cancer (GC) prognosis remains controversial. We searchedPubMed, Embase, Web of Science, and the Cochrane Library databases for relevant studies up to June 30, 2017. Primary outcomes were hazard ratio (HR), odds ratio (OR), and 95% confidence intervals (CI) for association with overall survival and clinicopathological features. Eleven studies comprising 2481 GC patients were analyzed. Pooled analysis showed that PIK3CA upregulation was significantly associated with worse overall survival (HR = 1.79, 95% CI 1.42-2.27,p< 0.001) at the protein (HR = 1.94, 95% CI 1.52-2.47,p< 0.001) but not the gene (HR = 1.57, 95% CI 0.92-2.69,p= 0.097) level.PIK3CAgene mutation did not correlate with overall survival (HR = 1.05, 95% CI 0.83-1.34,p= 0.666) but was significantly associated with poor tumor differentiation (OR = 0.37, 95% CI 0.17-0.76,p= 0.011). High PIK3CA protein expression predicted poor prognosis in GC, whereasPIK3CAgene amplification or mutation did not. Moreover,PIK3CAmutation was an indicator...Continue Reading

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