Risk factors for primary central nervous system lymphoma: a case-control study.

BACKGROUND The incidence of primary central nervous system lymphoma (PCNSL) has increased over time in both immunocompetent and immunodeficient individuals. The reasons for the increase among immunocompetent patients are unclear. METHODS The authors conducted a case-control study of PCNSL at the Mayo Clinic based on cases from local community and referral… (More)