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

Abstract

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). 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). 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. 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.