Mitomycin C at a dose of 12 mg/m2 i.v. q 3 weeks was administered to 34 patients with measurable progressive advanced soft tissue sarcomas. No objective response was observed although in one of the 12 patients with overall stabilisation of disease a partial response was reported in lung lesions. The side-effects observed in this group of patients were generally mild. On the basis of this result the application of mitomycin C in this disease cannot be recommended.