Comparison of patients with and without pre-existing lymphoma at diagnosis of primary Sjögren’s syndrome

In the 2016 American College of Rheumatology/European League Against Rheumatism classification criteria for primary Sjögren's syndrome (pSS), pre-existing lymphoma is not an exclusion criterion for pSS diagnosis, as in earlier criteria. We aimed to explore whether there are differences between pSS patients with and without pre-existing lymphoma at pSS diagnosis.Patients with ICD-7-10 codes for Sjögren's syndrome (SS) and a diagnosis of malignant...