Overall Survival (OS) at 1 Year

Regimen A (R-CODOX-M Chemotherapy)

Patients receive rituximab IV and doxorubicin hydrochloride IV over 15 minutes on day 1, cyclophosphamide IV over 30-60 minutes on days 1 and 2, pegfilgrastim SC on day 3, vincristine IV on days 1 and 8, high-dose methotrexate IV over 2-4 hours on day 15, and leucovorin calcium IV beginning 24 hours after the start of methotrexate and continuing every 6 hours until level is adequate. Patients receive CNS prophylaxis of methotrexate IT, cytarabine IT, and hydrocortisone IT on day 1. Patients with high-risk disease receive an additional dose of cytarabine IT on day 3. Patients also receive G-CSF SC once daily on days 3-9. Once the methotrexate levels drops below 50 nmol/L, patients resume G-CSF SC once daily beginning on approximately day 18 and continuing until blood counts recover.

Regimen B (Rituximab and IVAC Chemotherapy)

Patients receive rituximab IV on day 1, ifosfamide IV continuously and etoposide IV continuously over 24 hours on days 1-5, and high-dose cytarabine IV over 1-3 hours twice daily on days 1-2. Patients receive CNS prophylaxis comprising methotrexate IT and hydrocortisone IT on day 5. Patients also receive pegfilgrastim SC once 24-48 hours after completion of chemotherapy OR G-CSF SC beginning on day 6 and continuing until blood counts recover. Patients with CNS involvement (leptomeningeal and/or intraparenchymal) at diagnosis do not receive CNS prophylaxis as above. Instead, these patients receive a combination of sequential liposomal cytarabine and methotrexate IT or via an Ommaya reservoir on day 1 and then every 14 days as tolerated until completion of systemic chemotherapy.

Analysis denominator · Participants