The course and outcome of pemphigus are worse in patients who are young at diagnosis (< 40 years) or of Sephardic Jewish origin. Mucosal involvement at diagnosis and poor response to treatment also predict poor outcome. The mortality rate of pemphigus is apparently lower than reported in the literature, perhaps because of the contemporary use of adjuvant immunomodulatory therapeutic agents.
Patients with pemphigus seem to have a higher rate of autoimmune thyroid disease and rheumatoid arthritis than both the general population and their own first-degree relatives. Further studies comparing patients with pemphigus with healthy controls are needed to stratify their risk factors for developing other autoimmune diseases and to define guidelines regarding diagnosis and treatment of coexistent autoimmune disorders.
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