[Weekly administration of low-dose paclitaxel for advanced or metastatic breast cancer]

The activity and toxicity of a weekly infusion of low-dose paclitaxel was studied. Twelve patients with metastatic or advanced breast cancer received paclitaxel (80 mg/m2 over 1 h) every week. Administration was continued for 6 weeks with two weeks rest until disease progression or limiting toxicity. Dexamethasone 20 mg, diphenhydramine 50 mg, and ranitidine 50 mg were given prior to each dose of paclitaxel. Six patients had received prior standard CMF therapy, and four patients had received CMF and docetaxel therapy. Two patients had not received prior therapy. The overall response rate was 58% with 17% complete responses and 42% partial responses. Responses were observed in both patients without prior therapy, and in five of 10 (50%) with prior therapy. Grade 3/4 neutropenia occurred in one patient; febrile neutropenia was not observed. There was no neuropathy or hypersensitivity. Weekly paclitaxel is active and well tolerated in patients with metastatic or advanced breast cancer. This schedule allows a high cumulative dose of paclitaxel without major myelo- or neurotoxicity. This weekly regimen deserves further exploration.