For HIV-positive patients with Burkitt lymphoma, a modified intensive chemotherapy regimen produced overall and progression-free survival rates comparable with those seen in HIV-free patients with Burkitt, with manageable toxicities, reported researchers in a multicenter clinical trial.
The AIDS Malignancy Consortium (AMC) 048 study looked at the use of a modified version of the dose intensive CODOX-M/IVAC regimen, consisting of cyclophosphamide, vincristine, doxorubicin, high-dose methotrexate/ifosfamide, etoposide, and high-dose cytarabine. Compared with the standard regimen, the investigators added rituximab, reduced and/or rescheduled cyclophosphamide and methotrexate, limited the use of vincristine, and used combination intrathecal chemotherapy to prevent central nervous system involvement.
Courtesy Wikimedia Commons/Ed Uthman, MD/Creative Commons License
The study included 34 HIV-positive patients (30 men and 4 women) with Burkitt, 26 of whom were also receiving highly active antiretroviral therapy (HAART). The patients ranged in age from 19-55 (median 42) years. Of the 34 patients, 25 had Ann Arbor stage IV disease, 2 had stage III, 1 had stage IIE, 2 had stage II, and 4 had stage I. Median age was 42 years (range, 19-55 years).
The median CD4 count was 195 cells/mL; five patients had fewer than 100 cells/mL
Progression-free survival at 1 year was 69%, and 1- and 2-year overall survival were 72% and 69%, respectively.
The modified CODOX-M/IVAC regimen was associated with a grade 3 to 4 toxicity rate of 79%, with no grade 3 or 4 mucositis reported. In contrast, virtually all patients who receive the unmodified regimen develop at least one grade 3 or greater toxicity.
In total, there were 20 hematologic, 14 infectious, and 6 metabolic toxicities. Five patients did not complete treatment because of adverse events.
There were 11 deaths, including 1 treatment-related death of a patient with encephalopathy, hepatic failure, hepatitis B, and pneumonia cited as contributing causes. Of the remaining 10 patients, 8 died from systemic disease progression, and 2 died during follow-up, 1 during remission from a fungal infection and 1 from nonmalignant complications of HIV.
The investigators say that the addition of rituximab may have contributed to the favorable outcomes, and that rescheduling and limiting the amount of high-dose methotrexate delivered likely contributed to lower incidences of both severe mucositis and neutropenic fever.
Although a separate trial is evaluating a different regimen (EPOCH-R; etoposide, prednisone, vincristine, cyclophosphamide, doxorubicin, and rituximab) in Burkitt lymphoma, “the modified AMC 048 version of CODOX-M/IVAC-R may better serve patients who present with CNS disease or are at high risk for CNS relapse (e.g., patients with bone marrow, testicular, or multiple extranodal sites), because it contains high-dose cytarabine and methotrexate, drugs that cross the blood-brain barrier. Consequently, AMC048 represents a reasonable treatment option in the appropriate setting, possibly irrespective of HIV status.”
The study by Dr. Ariela Noy from the Memorial Sloan Kettering Cancer Center in New York and her colleagues, is published in Blood.