Phase II study of mitolactol in chemotherapy-refractory metastatic breast cancer

Thirty-eight evaluable patients with metastatic breast cancer refractory to hormonal therapy and multiple chemotherapy regimens were treated with mitolactol at a dose of 130 mg/m2/day orally for 10 days every 6 weeks. Only one patient, with nodal and chest wall metastases, had a sustained complete regression; two patients had stable disease; and 35 patients had disease progression. The toxicity, which was primarily hematologic, was acceptable.