Mucosa-associated lymphoid tissue lymphomas in two patients with rheumatoid arthritis on second-line agents, and secondary Sjögren's syndrome.

We report two patients with rheumatoid arthritis and secondary Sjögren's syndrome whose disease was complicated by a mucosa-associated lymphoid tissue (MALT) lymphoma. Although this particular type of lymphoma is associated with primary Sjögren's syndrome, it has not been described, to our knowledge, in the context of rheumatoid arthritis and Sjögren's syndrome. The potential causative factors are discussed.