Successful treatment of recalcitrant hidradenitis suppurativa with risankizumab after anti-TNF failure.

Dear Editor, hidradenitis suppurativa (HS) is a relapsing inflammatory skin disease. The cytokines IL-1β, IL-12, IL-23, IL-17 and TNF-α are involved in the inflammatory process. The only approved drug for the treatment of moderate-to-severe cases is adalimumab (TNF-α inhibitor). However, long-term clinical responses range only from 52-57%. Tildrakizumab (anti-IL-23), guselkumab (anti-IL-23) and ustekinumab (anti-IL-12/23) have been successfully used in HS.

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