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BACKGROUND Recent studies suggest a relatively high prevalence of autoimmune diseases (AD) among primary CNS lymphoma (PCNSL) patients, however the literature is limited to case reports. To gain a better understanding of AD-associated PCNSL we reviewed all previous cases described in the literature. MATERIAL AND METHODS We mined the MEDLINE database using the search terms ‘central nervous system lymphoma’ or ‘CNS lymphoma’ along with AD-related terms, such as ‘immunosuppression’, ‘autoimmune’, the name of various AD, or commonly prescribed immunosuppressants. We selected 35 records for qualitative synthesis of data. We identified 43 AD-associated PCNSL in the literature and added five unpublished cases from our institution. Clinical, imaging and outcome data were collected. RESULTS Most prevalent ADs were systemic lupus erythematosus (22.9%), multiple sclerosis (18.8%) and myasthenia gravis (14.6%). Male-to-female ratio was 1:2 and median age at diagnosis was 57 years (range: 2.5–88). Most common immunosuppressants included prednisone (58.7%), mycophenolate (43.5%), and azathioprine (41.3%). Median interval from diagnosis of AD until diagnosis of PCNSL was 96 months (range: 11–360). Lesions typically localized to the hemispheres (64.1%) and displayed peripheral contrast enhancement (75.8%). Histology revealed diffuse large-B-cell lymphomas (76.7%) and Epstein-Barr virus (EBV) positivity (78.4%). Treatment included reduction of immunosuppression (100%) and chemotherapy (85.4%) in most cases. Median overall survival was 31 months. CONCLUSION AD-associated PCNSL are characterized by peripheral contrast enhancement on imaging and EBV positivity. AD that require severe immunosuppression appear over-represented. Median interval of immunosuppression and overall survival seem longer than in other immunodeficiency-associated PCNSL.

P14.26 Autoimmune disease-associated primary CNS lymphoma: Meta-analysis and review of literature