Efficacy of topical latanoprost vs topical betamethasone diproprionate lotion in localized alopecia areata- IJDVL study
Alopecia areata is an autoimmune non‑scarring alopecia disorder which normally affects the scalp but can involve any hair bearing area of the body. Topical corticosteroids are considered the standard therapy for treatment of alopecia areata. The serendipitous discovery of eyelash hypertrichosis induced by latanoprost in patients treated for glaucoma led to its trials in treatment of alopecia areata involving eyelashes. Recently a randomized control trial comparing efficacy of topical latanoprost to topical steroid in localized scalp alopecia areata was published in the Indian Journal of Dermatology, Venereology and Leprology.
The present study was a single centre randomized two‑arm parallel‑group efficacy trial conducted at the dermatology outpatient department of the Postgraduate Institute of Medical Education and Research, Chandigarh, India between January 2013 and June 2014 to assess the efficacy of topical latanoprost 0.005% ophthalmic solution in localized scalp alopecia areata and to compare its efficacy as monotherapy with topical corticosteroid monotherapy, i.e., betamethasone dipropionate 0.05% lotion.
Patients with presence of ≤5 patches of alopecia areata, involving less than 40% scalp area and stable disease for at least 15 days were included. Patients with active/severe disease, on treatment, having other coexisting hair disorder or any other contraindication to treatment were excluded. Pregnant and lactating women were excluded. Fifty consecutive patients were randomized in a 1:1 ratio to receive either topical latanoprost 0.005% ophthalmic solution (group 1) or topical betamethasone diproprionate 0.05% lotion (group 2), both to be applied twice daily.
Clinical assessment and measurement of the area involved and photographic documentation were done at 4‑weeks intervals by the same assessor throughout the study period. Therapeutic success was evaluated on the basis of a modification of the hair regrowth score (a five‑point semi‑quantitative score) at the end of 16 weeks: 0 = no change or further loss, 1 = 1–24% regrowth, 2 = 25–49% regrowth, 3 = 50–74% regrowth, 4 = 75–99% regrowth and 5 = 100% regrowth
Results
The median (interquartile range) duration of disease was 3 (1–5.3) months while the median surface area involved with alopecia areata was 7.5 (3–13) cm2. Nail changes were seen in 21 (42%) patients, the most common being leukonychia (11 [22%]), Beau's lines (7 [14%]) and pitting (5 [10%]).
The percentage reduction in area involved with alopecia areata at 16 weeks (primary outcome) was lower in latanoprost vs. betamethasone group (median [interquartile range], 11.1 [0–99.1] vs. 100% [13.6–100], P = 0.02). Significantly lesser patients in the latanoprost group had a complete response to treatment as compared to the betamethasone group (6 [24%] vs. 14 [56%], P = 0.02). The median (interquartile range) hair regrowth score was significantly lower in the latanoprost vs. the betamethasone group (1 [0–4.5] vs. 5 [1–5], P = 0.02). Subjects in the betamethasone group showed a more rapid reduction in the involved area.
When per-protocol analysis was used the results were good with latanoprost (71% reduction in hair loss area) though inferior compared to betamethasone (100% reduction) indicating a good improvement with latanoprost also if the patient is compliant.
Erythema was the only adverse effect observed in the latanoprost group while erythema, skin atrophy, telangiectasia, dermatitis and pustules were observed in the betamethasone group.
This is the first study evaluating the efficacy of topical latanoprost on non‑eyelash (scalp) alopecia areata and comparing it head‑to‑head with a potent topical steroid, so as to assess it as monotherapy, as an alternative to topical corticosteroid. The results suggest that topical latanoprost 0.005% ophthalmic solution is less effective but safer than topical betamethasone dipropionate 0.05% lotion in the treatment of localized alopecia areata and results can be even better if patients are conscious and regular in medication use.
Source
Bhat S, Handa S, De D. A randomized comparative study of the efficacy of topical latanoprost versus topical betamethasone diproprionate lotion in the treatment of localized alopecia areata. Indian J Dermatol Venereol Leprol. 2021 Jan-Feb;87(1):42-48. doi: 10.25259/IJDVL_787_19. PMID: 33580923.