Twenty-one patients with malignant pleural effusion (MPE) were prospec
tively entered into a nonrandomized, single-armed study to evaluate th
e efficacy and safety of recombinant interferon (IFN) alpha-2b (INTRON
A; Schering-Plough; Kenilworth, NJ) as an intrapleural palliative age
nt. From March 1989 through February 1993 (48 months), 21 patients wer
e entered into the study. No symptomatic effusion recurred and no subs
tantial side effects were associated with treatment. This suggests rec
ombinant IFN alpha-2b represents a safe and effective intrapleural age
nt for the palliation of MPE.