High-dose paclitaxel plus G-CSF for malignant mesothelioma: CALGB phase IIstudy 9234

Background: New agents with activity in mesothelioma are sorely needed. The Cancer and Leukemia Group B (CALGB) therefore performed a phase II study o f high-dose paclitaxel in patients with malignant mesothelioma who had no p rior chemotherapy. Patients and methods: Thirty-five patients accrued to this multi-institutio nal phase II study of paclitaxel given as a 24-hour infusion at 250 mg/m(2) every three weeks plus filgrastim (G-CSF) 300 mcg subcutaneously days 3-18 . Results: There were three (9%) regressions of evaluable disease. The median survival was five months (95% confidence interval (95% CI): 1.9-9.6 months ), the one-year survival rate was 14% and the two-year survival rate was 6% . Toxicity was tolerable with one death from pneumonia (without neutropenia ) on day 18 and a 23% rate of grade 4 granulocytopenia. Conclusions: The level of activity seen with paclitaxel is similar to that seen in other CALGB trials of the single agents carboplatin, trimetrexate a nd 5-azacytidine. Future studies of of paclitaxel (at lower doses) in combi nation with synergistic agents could be considered.