title: Prognostic role of PIK3CA mutations and their association with hormone receptor expression in breast cancer: a meta-analysis.
abstract: The phosphatidylinositol-4, 5-bisphosphate 3-kinase, catalytic subunit alpha (PIK3CA) gene is frequently mutated in breast cancer (BCa). Sex hormone receptors (HRs), including estrogen receptor (ER) and progesterone receptor (PR) play pivotal roles in BCa. In this study, we evaluated the association between PIK3CA mutations and ER/PR expression and the prognostic role of PIK3CA mutations in BCa patients, and in particular, HR-positive BCa. Thirty-two studies involving 5719 cases of BCa obtained from database searches were examined. PIK3CA gene mutations correlated significantly with ER/PR expression (p < 0.00001) and relapse-free survival (RFS) (hazard ratio [HR] 0.76, 95% confidence interval [CI] 0.59-0.98, p = 0.03) but not overall survival (OS) (HR 1.14, 95%CI 0.72-1.82, p = 0.57) in unsorted BCa patients. PIK3CA mutations were not associated with OS (HR 1.06, 95%CI 0.67-1.67, p = 0.81) or RFS (HR 0.86, 95%CI 0.53-1.40, p = 0.55) in HR-positive BCa patients. In conclusion, PIK3CA mutations were significantly related to ER/PR expression and RFS in unsorted BCa patients. However, the clinical implications of PIK3CA mutations may vary according to different mutant exons. And PIK3CA mutations alone may have limited prognostic value for HR-positive BCa patients.
authors.affiliation: Clinical laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beixian Ge 5#, XiCheng District, Beijing 100053, China.
authors.forename: Bo
authors.initials: B
authors.lastname: Pang
authors.affiliation: Clinical laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beixian Ge 5#, XiCheng District, Beijing 100053, China.
authors.forename: Shi
authors.initials: S
authors.lastname: Cheng
authors.affiliation: Clinical laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beixian Ge 5#, XiCheng District, Beijing 100053, China.
authors.forename: Shi-Peng
authors.initials: SP
authors.lastname: Sun
authors.affiliation: Clinical laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beixian Ge 5#, XiCheng District, Beijing 100053, China.
authors.forename: Cheng
authors.initials: C
authors.lastname: An
authors.affiliation: Clinical laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beixian Ge 5#, XiCheng District, Beijing 100053, China.
authors.forename: Zhi-Yuan
authors.initials: ZY
authors.lastname: Liu
authors.affiliation: Clinical laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beixian Ge 5#, XiCheng District, Beijing 100053, China.
authors.forename: Xue
authors.initials: X
authors.lastname: Feng
authors.affiliation: Clinical laboratory, Guang'anmen Hospital, China Academy of Chinese Medical Sciences, Beixian Ge 5#, XiCheng District, Beijing 100053, China.
authors.forename: Gui-Jian
authors.initials: GJ
authors.lastname: Liu
mesh_terms: D001943:Breast Neoplasms / Q000235:genetics* / Q000473:pathology*; D058534:Class I Phosphatidylinositol 3-Kinases; D005091:Exons / Q000235:genetics; D005260:Female; D006801:Humans; D009154:Mutation / Q000235:genetics*; D009364:Neoplasm Recurrence, Local / Q000235:genetics / Q000473:pathology; D019869:Phosphatidylinositol 3-Kinases / Q000235:genetics*; D011379:Prognosis; D011960:Receptors, Estrogen / Q000235:genetics*; D011980:Receptors, Progesterone / Q000235:genetics*
chemical_list: D011960:Receptors, Estrogen; D011980:Receptors, Progesterone; D019869:Phosphatidylinositol 3-Kinases; D058534:Class I Phosphatidylinositol 3-Kinases; C484760:PIK3CA protein, human