<qa>  What is the COMRAP regimen?INDUCTION THERAPY: Patients receive the COMRAP regimen comprising rituximab IV, vincristine IV, and HD-MTX IV over 4 hours on day 0; PRED or MePRDL IV or orally on days 0-7; leucovorin calcium IV or orally and cyclophosphamide IV over 15 minutes on days 1-3; doxorubicin IV over 30-60 minutes on day 1; TIT on days 1, 3, and 5; and G-CSF SC on days 6-20. 