Randomized trial of transfer factor treatment of human warts.

Dialysed transfer factor, prepared from the leucocytes of a donor whose warts had undergone recent spontaneous regression, was used in the treatment of a child with the Wiskott--Aldrich syndrome. The child then had a spontaneous regression at multiple warty areas. A similar relationship was seen in four otherwise healthy patients in a pilot study. A randomized double-blind study of thirty patients failed to confirm a causal relationship between the transfer factor therapy (equivalent to 2-1 X 10(8) leucocytes) and wart regressions. The need for randomized trials of transfer factor therapy for diseases with a variable natural history is emphasized.