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Breast Cancer Research and Treatment

, Volume 152, Issue 3, pp 463–476 | Cite as

The predictive and prognostic role of phosphatase phosphoinositol-3 (PI3) kinase (PIK3CA) mutation in HER2-positive breast cancer receiving HER2-targeted therapy: a meta-analysis

  • Ezzeldin M. IbrahimEmail author
  • Ghieth A. Kazkaz
  • Mubarak M. Al-Mansour
  • Meteb E. Al-Foheidi
Review

Abstract

The association between PIK3CA mutation and resistance to anti-HER2 therapy (AHT) is not precisely defined. This meta-analysis intended to explore the clinical utility of PIK3CA mutation in HER2-positive breast cancer treated with AHT. Literature search identified 19 eligible studies. There were 1720 patients with advanced, 828 with early and 1290 patients treated in the neoadjuvant setting. In metastatic breast cancer, AHT showed no differential objective response benefit between the wild type (WT) and the mutated type (MT) PIK3CA subgroups (odds ratio [OR] = 1.09; 95 % CI 0.60–2.00; P = 0.78). AHT favorable affected progression-free survival (PFS) irrespective of PIK3CA mutation. There was no PFS difference between WT and MT regardless of the offered therapy. In early breast cancer, trastuzumab combined with the same chemotherapy conferred consistent relapse-free survival benefit in WT and MT subgroups (WT: HR = 0.59; 95 % CI 0.44–0.80; P < 0.001 vs. MT: HR = 0.42; 95 % CI 0.24–0.74; P < 0.001). In the neoadjuvant setting, AHT-based therapy produced a 72 % higher pathologic complete response (pCR) rate in WT as compared with that in MT PIK3CA tumors (OR = 1.72; 95 % CI 1.29–2.13; P < 0.001). In that setting, there was no disease-free or overall survival difference based on PIK3CA mutational status. In this meta-analysis, AHT did not achieve differential benefit according to PIK3CA mutation in HER2-positive metastatic or early breast cancer; however, in the neoadjuvant setting, patients harboring WT PIK3CA tumors attained a higher pCR rate.

Keywords

Breast cancer HER2-positive PIK3CA Mutation Prognostic Predictive 

Notes

Compliance with Ethical Standards

Conflict of interest

None.

Ethical standards

The meta-analysis complies with the current laws of Saudi Arabia.

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Ezzeldin M. Ibrahim
    • 1
    Email author
  • Ghieth A. Kazkaz
    • 1
  • Mubarak M. Al-Mansour
    • 2
  • Meteb E. Al-Foheidi
    • 2
  1. 1.Oncology Center of ExcellenceInternational Medical CenterJeddahKingdom of Saudi Arabia
  2. 2.Princess Noorah Oncology CenterJeddahKingdom of Saudi Arabia

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