Why can dermatomyositis be associated with cancer in some older adults?

Dermatomyositis is a chronic inflammatory condition affecting the skin and muscles, characterized by an autoimmune reaction where the immune system attacks the body's own cells. While the specific cause of this autoimmune response remains unknown, the disease is frequently observed in association with other autoimmune disorders and, notably, with cancer in a significant proportion of older patients.12

In adults, dermatomyositis is linked to a higher incidence of certain malignancies, including those of the lung, breast, and gastrointestinal tract. Although the precise biological mechanism explaining why this specific muscle disease is associated with cancer in older adults is not fully understood, the clinical correlation is well-documented in medical literature. Because of this association, the presence of dermatomyositis in an older adult often warrants clinical investigation for underlying malignancy.12