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Profile of Tirbanibulin for the Treatment of Actinic Keratosis.

Actinic keratosis (AK) is a chronic disease resulting from deleterious effects of long-term, cumulative, epidermal exposure to ultraviolet (UV) light. UV-induced mutations in p53, ras, and p16 genes lead to the emergence of abnormal epidermal actinic keratosis (AKs) cells, which proliferate while avoiding apoptosis and may lead to invasive squamous cell carcinoma. There are both lesion-targeted and field-directed topical treatments. This review is of new and emerging information on tirbanibulin and tirbanibulin 1% ointment, which is approved for topical field treatment of actinic keratosis on the face and scalp. Potent antiproliferative and proapoptotic activities result from tirbanibulin's inhibition tubulin polymerization and disruption of microtubule formation and Src kinase signaling. Tirbanibulin 1% ointment is an effective treatment of facial and scalp AK after five consecutive once-daily applications, as measured by complete and partial clearance and percent reduction in the number of lesions. Localized skin reactions are usually mild to moderate, resolving within a month. The short and well-tolerated course of therapy results in very high patient adherence to the treatment regimen.