Primary central nervous system lymphoma (PCNSL) is an aggressive extranodal non-Hodgkin lymphoma confined to the central nervous system. In this article, we report the results of a pilot trial adding rituximab to the established regimen consisting of methotrexate, procarbazine, and lomustine (R-MCP). Design and methods: PCNSL patients ≥65 years without Karnofsky performance score (KPS) limit were included. R-MCP regimen consisted of rituximab (375 mg/m(2) i.v. on days -6, 1, 15, and 29), methotrexate (3 g/m(2) i.v., days 2, 16, and 30) followed by folinic rescue, procarbazine (60 mg/m(2) orally, days 2-11), and lomustine (110 mg/m(2) orally, day 2). A maximum of three 43-day cycles were applied. Primary end point was response to treatment obtained by magnetic resonance imaging. Secondary end points were overall survival (OS) and progression-free survival (PFS).
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