Squaric acid dibutylester (SADBE) is a strong topical sensitizer that lacks mutagenic properties. It has been used as an allergen in the topical therapy of patients with alopecia areata, with 50% to 90% of such patients responding.1-5 Since SADBE immunotherapy usually requires a prolonged period of treatment, it would be helpful to know which factors affect treatment outcome. Several previous studies1-4 mention some factors, but most of them lack detailed statistical comparisons of patients' responses to therapy with regard to prognostic factors. Thus, we investigated the efficacy of topical immunotherapy with SADBE in patients with alopecia areata using an uncontrolled study and evaluated the relative importance of various prognostic factors in treatment outcome.
Materials and Methods.
A total of 48 patients (16 males and 32 females; age range, 6-57 years) with alopecia areata involving more than 25% of the scalp were evaluated. They included 31 patients with patchy
Iijima S, Otsuka F. Prognostic Factors for Clinical Response of Alopecia Areata to Topical Immunotherapy With Squaric Acid Dibutylester. Arch Dermatol. 1997;133(4):539-540. doi:10.1001/archderm.1997.03890400145035