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Background: There have been multiple reports of the anti-IL-4Rα agent, dupilumab, being associated with the onset and/or progression of cutaneous T-cell lymphoma (CTCL).

Objective: We sought to evaluate safety signals associated with dupilumab, with a focus on CTCL, and to evaluate the possible underlying mechanism or mechanisms for the potential association.

Methods: First, we used the Food and Drug Administration's pharmacovigilance database, FAERS (FDA Adverse Event Reporting System), to evaluate whether dupilumab was associated with CTCL, including both positive outcome controls (conjunctivitis, eosinophilia, and arthralgia) and exposure controls (other medications with similar indications, including JAK inhibitors and the anti-IL-13 agent, tralokinumab) to evaluate confounding bias.

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Monoclonal antibodies targeting type 2 inflammation are promising treatments for eosinophilic-associated diseases. There is growing interest in the potential benefits of combining two biologics to treat patients with poorly controlled conditions. We present a case of a 54-year-old female patient affected with a relapsing-refractory ANCA myeloperoxidase positive eosinophilic granulomatosis with polyangiitis (EGPA), presenting with difficult-to-treat asthma and rhino-sinusitis manifestations.

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Introduction: Transient eosinophilia is not uncommon in patients with moderate-to-severe atopic dermatitis (AD) treated with dupilumab.

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