- Describe the morphology, phenotype, and cytogenetics, using fresh tumor tissue (when possible), in patients with Burkitt's or Burkitt-like lymphoma/leukemia treated with the CODOX-M chemotherapy regimen (cyclophosphamide, vincristine, doxorubicin, and methotrexate) alone or alternating with the IVAC chemotherapy regimen (ifosfamide, etoposide, and cytarabine).