Intralesional Steroids in the Treatment of Alopecia Areata

Alopecia areata (AA) is a major medical problem and is the most prevalent autoimmune disease in the US. AA represents the second most common form of hair loss and causes significant disfigurement and psychological distress to affected individuals. AA affects more individuals than most other autoimmune diseases combined, including lupus erythematosus, type 1 diabetes, psoriasis, multiple sclerosis and rheumatoid arthritis. In contrast to these conditions, research into the pathogenesis and the development of innovative therapies in AA has lagged behind. Alopecia areata is a common form of hair loss which reportedly occurs in up to 1.7% of the population at some time in their life. Alopecia areata is apparently triggered when the individual's own immune system attacks hair follicles on the scalp or body resulting in hair loss ranging from single patches on the scalp (patch type alopecia areata) to loss of every hair on the scalp and body (alopecia universalis). Currently, there are limited treatment options for alopecia areata and unfortunately, the treatments utilized have never been rigorously tested in a placebo controlled trial. Triamcinolone (Kenalog) is a steroid solution that has been used as a treatment for alopecia areata for over 50 years. It is administered via injection into the scalp and appears to have some efficacy for patients with mild to moderate alopecia areata. The investigators currently do not have objective data on the frequency of occurrence of successful regrowth, the duration of response or the incidence of side effects. Intralesional triamcinolone (IL TAC) is arguably the most commonly used treatments for AA, especially in patients with less than 50% hair loss. Despite this, there are no adequately powered, randomized controlled clinical trials (RCTs) examining the efficacy, safety, and duration of effect of IL TAC. In addition, the dosage or strength used varies among practitioners and the efficacy and safety of alternate doses of IL TAC has never been examined in a well designed RCT. Quantitative biomarkers for AA are a crucial step toward translational research aimed at clinical trials in AA.