Patients with psoriasis are more likely than the general population to receive a diagnosis of malignant lymphoma, a large Danish study has found.

Malignant lymphomas are known to occur more frequently among patients with chronic inflammatory and autoimmune diseases, such as Sj√∂gren’s syndrome and rheumatoid arthritis, but whether the risk of lymphoma is greater in psoriasis has been a subject of controversy; some, but not all, studies have found an increased risk, and data from larger studies are limited.

Results from one of the largest studies to date, which quantifies the five-year risk of new-onset Hodgkin lymphoma (HL), non-Hodgkin lymphoma (NHL) [excluding cutaneous T-cell lymphoma (CTCL)] and cutaneous T-cell lymphoma (CTCL) in patients with psoriasis, were presented at the Psoriasis: From Gene to Clinic International Congress in London on Thursday 30th November.