A retrospective assessment of outcomes of chemotherapy-based versus radiation-only adjuvant treatment for completely resected stage I-IV uterine carcinosarcoma.

PURPOSE: To determine the progression-free survival (PFS) and overall survival (OS) in a cohort of patients who received either platinum-based chemotherapy with or without radiation therapy (pelvic or WAI), or RT alone.

METHODS

Memorial Sloan-Kettering Cancer Center (MSKCC) electronic medical records from 8/1/1995 to 10/3/2007 were reviewed for patient age, diagnosis date, type of primary surgery, residual disease at the completion of primary surgery, FIGO stage, treatment details, dates of progression and death, and site(s) of first recurrence. PFS and OS by stage (I/II v III/IV) and by treatment type (chemotherapy with or without RT v RT alone) were determined using landmark analyses 8 weeks after surgery. Patients who received chemotherapy with or without RT (pelvic or abdominal) or RT alone (pelvic or abdominal) were included in the analysis. Both groups were allowed to have received intravaginal radiation therapy (IVRT).

RESULTS

Forty-nine patients met study criteria. Thirty-eight/49 patients received chemotherapy: 23/38 (60.5%) received paclitaxel-carboplatin; 7/38 (18.4%) received ifosfamide-platinum; 8/38 (21.0%) received other chemotherapy. FIGO stage was: I=15 (31%); II=5 (10%); III=21 (43%); IV=8 (16%). Three-year PFS for the entire cohort was 24%. Three-year OS for the entire cohort was 60%. Three-year median PFS time for the entire cohort was 15 months (95% CI: 11-25 months). Three-year median OS time for the entire cohort was 67 months (95% CI: 23-89 months). Three-year PFS for stages I-II was 43% v 14% for stages III-IV (HR=1.98 [0.9-4.33]); P=0.082. Three-year OS for stages I-II was 68% v 55% for stages III-IV (HR=1.26 [0.47-3.41]); P=0.648. Three-year PFS for chemotherapy with or without RT was 35% v 9% for RT alone (HR=1.74 [0.79-3.85]); P=0.164. Three-year OS for chemotherapy with or without RT was 66% v 34% for RT alone (HR=2.02 [0.77-5.33]); P=0.146.

CONCLUSIONS

Our study corroborates GOG 150 results, and shows that paclitaxel-carboplatin appears to be an efficacious adjuvant chemotherapy regimen for completely resected uterine carcinosarcoma. The role of adjuvant RT in addition to chemotherapy warrants further investigation.