Evaluation of the effect of continuous infusion recombinant interleukin-2 (bioleukin) on peripheral blood leucocytes of patients with terminal malignancy.

Seventeen patients with terminal malignancy have been entered into a sequential investigation of two doses of continuous infusion recombinant interleukin-2 (bioleukin) given in the setting of a general ward. After an initial experience of a dose of 300 micrograms m-2 in eight patients the remainder received 400 micrograms m-2. Temporary interruption of treatment at the first sign of any serious toxicity led to rapid resolution of side-effects. No patient needed intensive care support, although nine of 17 required temporary interruption of infusion, lasting on average 4 h. Median lymphocyte rebound on day 14 was 3.6 times the pre-treatment level. It remained above pre-treatment levels in four of five patients who had no shown disease progression at day 56 after more than 28 days off treatment. Minor responses occurred in five patients, lasting on average 4 months.