Commentary

A Boxed Warning for Inadequate Psoriasis Treatment

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The US Food and Drug Administration uses the term boxed warning to highlight potentially dangerous situations associated with prescription drugs. A boxed warning is used when “[T]here is an adverse reaction so serious in proportion to the potential benefit from the drug (e.g., a fatal, life-threatening or permanently disabling adverse reaction) that it is essential that it be considered in assessing the risks and benefits of using the drug.”1 However, drugs are not the only potential cause of severe adverse outcomes in patients with psoriasis. Untreated psoriasis also is a well-established cause of serious morbidity and mortality. What are the risks of inadequate psoriasis treatment?

Psoriasis is associated with an increased risk for cardiovascular disease.2-4 Patients with psoriasis also have a higher prevalence of classic cardiovascular risk factors including smoking, diabetes mellitus, hypertension, obesity, and hyperlipidemia.5,6 Psoriasis is a T-cell mediated disease process driven by IL-23 and TH17 helper cell–derived proinflammatory cytokines, sharing certain genetic aspects with metabolic syndrome.6 Cytokine actions on insulin signaling, lipid metabolism, and adipogenesis may underlie the increased prevalence of metabolic syndrome and cardiovascular risk factors in patients with psoriasis. In addition to treating the cutaneous manifestations of psoriasis, reducing inflammation in these patients reduces C-reactive protein and lipid peroxidation and increases high-density lipoprotein levels.6 Tumor necrosis factor α blockers decrease the risk for cardiovascular disease in patients with psoriasis.7,8 Lower than expected rates of cardiovascular disease also have been reported in a large cohort of psoriasis patients (ie, PSOLAR [Psoriasis Longitudinal Assessment and Registry] registry) being treated with either ustekinumab or tumor necrosis factor α blockers.9

Psoriatic arthritis is a chronic inflammatory disease in which active inflammation results in progressive joint destruction.10 Tumor necrosis factor α inhibitors suppress disease progression, preserve function, and delay destruction of the joints. Ustekinumab also helps control psoriatic arthritis and inhibits radiographic progression of joint disease.11

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