In all studies, Aldara was more effective than placebo. • In the treatment of genital warts, the total clearance rate across the four main studies was 15 to 52% in the Aldara-treated patients, compared with 3 to 18% in the placebo-treated patients. • When the results of the two studies in basal cell carcinoma were looked at together, total clearance was seen in 66 to 80% of Aldara-treated patients compared with 0 to 3% in the placebo group.