PIK3CA mutation analysis in Chinese patients with surgically resected cervical cancer.

The aim of this study was to evaluate the clinicopathological and prognostic relevance of PIK3CA mutations in Chinese patients with surgically resected cervical cancer. PIK3CA mutations were screened in 771 cervical cancer specimens using reverse transcription polymerase chain reaction and Sanger sequencing. In total, 13.6% (105 of 771) of patients harbored non-synonymous PIK3CA mutations. Patients harboring PIK3CA mutations were older than patients with wild-type PIK3CA (mean age: 50.7 years vs. 47.0 years, P < 0.01). PIK3CA mutations were more commonly observed in postmenopausal patients than in premenopausal patients (19.6% vs. 10.2%, P < 0.01). PIK3CA mutations were more common in squamous cell carcinomas than in non-squamous cell tumors (15.3% vs 7.3%, of P < 0.01). The 3-year relapse-free survival was 90.2% for PIK3CA mutant patients and 80.9% for PIK3CA wild-type patients (P = 0.03). PIK3CA mutation was confirmed as an independent predictor for better treatment outcome in the multivariate analyses (HR = 0.54, 95% CI: 0.29-0.99, P = 0.048). PIK3CA mutations were significantly associated with less distant metastases (mutant-type: 8/105, wild-type: 98/666, p = 0.048). Thus, patients with mutant PIK3CA had distinct characteristics in age, menopausal status, and histological subtype and have better treatment outcome and less distant metastasis after surgery-based multimodal therapy.