Platinum resistance and impaired survival in patients with advanced primary peritoneal carcinoma: matched-case comparison with patients with epithelial ovarian carcinoma.

Overview

OBJECTIVE: The objective of the study was to compare chemotherapy response and survival of patients with advanced primary peritoneal carcinoma (PPC) vs those with epithelial ovarian carcinoma (EOC). STUDY DESIGN: From 1998 to 2004, 43 PPC patients were identified and matched to 129 patients with International Federation of Gynecology and Obstetrics stage IIIC-IV EOC by criteria abstracted from medical records. Primary endpoints were chemotherapy response, platinum resistance, progression-free survival (PFS), and overall survival (OS). RESULTS: All patients received primary platinum-taxane chemotherapy. There was no significant difference in achieving a clinical complete response. PPC patients were more likely to be platinum resistant at 6 months and had significantly impaired PFS and OS. After multivariate analysis, PPC was independently associated with a worse prognosis for both survival endpoints. CONCLUSION: PPC was associated with a similar initial response but a higher rate of platinum resistance and shorter PFS and OS. Consideration of these results may be useful for patient counseling, trial stratification, and molecular comparisons.