Intermediate Dose of IV MTX as CNS Prophylaxis for High Risk DLBCL

Overview

Central nervous system (CNS) relapse is a devastating event of diffuse large B cell lymphoma (DLBCL). It occurs in 4%-7% of DLBCL in general and the rate is considerably higher in high-risk patients, resulting in a poor outcome.Effective methods of CNS prophylaxis have not yet been developed. Evidence for intrathecal or intravenous MTX are both controversial. In one previous study of PUMCH, IV MTX at a dose of 1g/m2 could significantly decrease the 2 year CNS relapse rate of high risk DLBCL(1.1% vs 12.1% for historic cohort, P=0.003). In current study, the investigators are aiming to confirm its efficacy through phase III study with intrathecal MTX as the controlled arm.

In this prospective, phase III, multicenter, randomized, controlled study, the investigatirs aim to compare the efficacy of intravenous MTX(IV arm) at a dose of 1g/m2 with intrathecal MTX(IT arm) in terms of preventing CNS relapse. All the patients will recieve RCHOP regimen as front-line treatment of DLBCL. Patients in IV arm will recieve 4 course of IV MTX, which is incorporated into the RCHOP, naming R-MTX-CHOP regimen. Patients in IT arm will be given intrathecal MTX for 4 courses (one time for each course). 2 year CNS relapse rate is the primary endpoint while 2 year PFS, 2 year OS and safety are the secondary endpoint.

Conditions