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Highly frequent PIK3CA amplification is associated with poor prognosis in gastric cancer

Jing Shi1, Demao Yao, Wei Liu

  • 1Department of Endocrinology, The First Affiliated Hospital of Xi'an Jiaotong University School of Medicine, Xi'an 710061, the People's Republic of China.

BMC Cancer
|February 2, 2012
PubMed
Abstract

Insights

PIK3CA amplification is common in gastric cancer, unlike mutations, and is linked to poorer patient survival. This suggests the PI3K/Akt pathway is a potential therapeutic target for gastric cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • The phosphoinositide 3-kinase (PI3K)/Akt pathway is crucial for cell growth and survival in cancers, including gastric cancer.
  • PIK3CA mutations and amplification frequently activate this pathway in various human cancers.
  • Previous research lacked comprehensive analysis of PIK3CA alterations and their impact on gastric cancer patient outcomes.

Purpose of the Study:

  • To investigate the prevalence of PIK3CA mutations and amplification in gastric cancer.
  • To determine the association between PIK3CA alterations and clinicopathological features.
  • To evaluate the prognostic significance of PIK3CA amplification in gastric cancer patients.

Main Methods:

  • Direct sequencing was used to detect PIK3CA mutations.
  • Real-time quantitative PCR assessed PIK3CA amplification.
  • Kaplan-Meier survival analysis correlated PIK3CA status with patient outcomes.

Main Results:

  • PIK3CA mutations occurred in 7.1% of patients, while amplification was found in 67%.
  • PIK3CA amplification correlated with increased phosphorylated Akt (p-Akt) levels and cancer-related death.
  • Patients with PIK3CA amplification exhibited significantly shorter survival times.

Conclusions:

  • PIK3CA amplification is a frequent event in gastric cancer, unlike mutations, and is a key driver of PI3K/Akt pathway activation.
  • PIK3CA amplification serves as a significant negative prognostic marker for gastric cancer patients.
  • Targeting the PI3K/Akt signaling pathway presents a promising therapeutic strategy for gastric cancer.

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