High-frequency low-dose multiple-drug chemotherapy in advanced metastatic breast cancer.

A small group of patients (22) with metastatic breast cancer, most of whom had advanced visceral disease, have been treated since 1973 with low-dose, multiple-drug chemotherapy: vinblastine, 0.05 mg/kg, I.V.; cyclophosphamide, 6 mg/kg P.O.; 5-fluorouracil, 500 mg. P.O., and methotrexate, 0.3 mg/kg P.O. The schedule includes the use of one drug on each of four days every week. The drugs were taken in the sequence listed on alternate days, except that dosages of methotrexate and vinblastine were consecutive. The remission rate was 68% (15/22). The median duration of remission was 30 months. The median survival time of responding patients exceeds 40 months. Of the 15 responding patients, six (40%) remain alive with a mean survival time of more than 46 months. The regimen causes minimal toxicity and has been willingly accepted by patients for as long a period as 54 months. A therapeutic advantage appears to have been achieved by this high-frequency, low-dose schedule.