Alpha interferon treatment of patients with hairy-cell leukaemia.

We have treated 10 patients with hairy-cell, or hairy-cell-like leukaemia, for more than 6 months, with alpha interferon 3 X 10(6) IV/day I.M. or subcutaneously. All patients were severely pancytopenic before treatment. 7 patients had a typical hairy-cell leukaemia, whereas 3 lacked hairy cells but had the characteristic bone-marrow infiltration. The peripheral blood counts improved in all patients during treatment and the lymphoid infiltration of the bone-marrow was shown to decrease. 1 patient obtained complete remission, 6 partial remission and 3 had a minor response. It is concluded that alpha interferon is effective in the treatment of patients suffering from hairy-cell leukaemia.