This is a multicenter, open-Label, randomised phase 2 study designed to evaluate the efficacy and safety of rituximab plus methotrexate with or without lenalidomide as first-line regimens in the treatment of primary central nervous system lymphoma. A total of 240 patients plan to participate in this study to receive a total 6 cycles of induction chemotherapy followed by 4 cycles of maintenance chemotherapy. Follow-ups should be taken up to the first 3 years.The primary endpoints were 2-year PFS rate and and secondary endpoints including objective response rate (ORR), PFS, overall survival (OS), and adverse events.
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