Abstract
INTRODUCTION: Dupilumab is an interleukin-4 (IL-4) receptor alpha antagonist indicated for the treatment of moderate-to-severe atopic dermatitis (AD), which could be associated with atopic and non-atopic comorbidities for which concomitant administration of targeted pharmacotherapy including monoclonal antibodies could be required. However, the safety of combining dupilumab with other monoclonal antibodies for different therapeutic indication may be debated. METHODS: We conducted an extensive search in MEDLINE via PubMed for original articles published from January 1, 2017 to October 22, 2022, reporting clinical cases in which dupilumab has been associated with other monoclonal antibodies. RESULTS: Four small case series were identified reporting data on a total of 16 patients. To them, we have added other patients (n = 8) derived from our clinical practice, achieving a total of 24 cases followed for a period of 2-22 months. Patients were receiving dupilumab mainly because of AD (except one patient for bullous pemphigoid and one for asthma) and other monoclonal antibodies for psoriasis treated with guselkumab (n = 7) and secukinumab (n = 1), asthma with omalizumab or benralizumab (n = 3), Crohn's disease with adalimumab (n = 3), chronic spontaneous urticaria with omalizumab (n = 3), primary familial hypercholesterolemia with evolocumab (n = 2), hidradenitis suppurativa with adalimumab (n = 1), psoriatic arthritis with secukinumab (n = 1), rheumatoid arthritis with abatacept (n = 1), ankylosing spondylitis with secukinumab (n = 1) and colorectal carcinoma with cetuximab (n = 1). No adverse events related to the combination of the two monoclonal antibodies were reported except for a mild injection site reaction (n = 1) and arthralgia, which resolved spontaneously within a few weeks (n = 1). CONCLUSIONS: Because the evidence is modest, the question remains open as to whether dupilumab can be safely combined with other monoclonal antibodies. Dupilumab does not exert immunosuppressive effects and does not impair the activity of cytochrome P450 isozymes.