ORLANDO – Folinic acid does not prevent oral mucositis in patients who are receiving a calcineurin inhibitor and methotrexate for graft-vs.-host disease prophylaxis, results of a multicenter study from Israel suggest.
Dr. Moshe Yeshrun
A randomized clinical trial to determine whether folinic acid rescue 24 hours after a methotrexate dose protects patients against severe oral mucositis was halted for futility after an interim analysis showed no advantage to adding folinic acid, reported Moshe Yeshrun, MD, of Rabin Medical Center at Tel Aviv University, Israel.
“Regarding the primary and secondary endpoints, we observed identical rates and duration of severe oral mucositis, as well as identical rates of oral mucositis of any grade in the folinic acid and placebo groups,” he said at the annual Transplantation and Cellular Therapy Meetings.
There were also no significant differences between the folinic acid and placebo control groups in time to neutrophil and platelet engraftment, rates of febrile neutropenia and bloodstream infections, veno-occlusive disease, need for opiates or total parenteral nutrition (TPN), or time from transplant to discharge, Dr. Yeshrun added at the meeting, held by the American Society for Blood and Marrow Transplantation and the Center for International Blood and Marrow Transplant Research.
Folinic acid therapy did not, however, appear to abrogate or interfere with the effects of methotrexate on prevention of either acute or chronic graft-vs-host disease (GVHD).
Severe adverse event
Oral mucositis can be a serious complication of therapy, associated with increased morbidity and mortality; significant pain; difficulty with eating or speaking; difficulty swallowing water, food, and medications; prolonged hospitalizations; and increased costs of care, Dr. Yeshrun noted.
The presence of oral mucositis sometimes leads clinicians to reduce or even skip methotrexate doses, thereby increasing risk for GVHD.
There are limited data from nonrandomized studies indicating that folinic acid (also called leucovorin) may reduce methotrexate-associated toxicities, and both the European Society for Blood and Marrow Transplantation and European LeukemiaNet working group recommend the use of folinic-acid rescue 24 hours following each methotrexate dose, Dr. Yeshrun said.
To see whether folinic acid rescue actually reduces the rate of methotrexate-induced toxicity and affects outcomes for patients who receive methotrexate post transplant for GVHD prophylaxis, Dr. Yeshrun and colleagues in three Israeli medical centers conducted a randomized, placebo-controlled trial.
The eligible study population included patients 18 and older with hematological malignancies in complete remission or minimal residual disease who underwent myeloablative conditioning and allogeneic transplant from HLA-matched or 1-antigen mismatched siblings or unrelated donors.
The patients were stratified by treatment center and intensity of the conditioning regimen, and then randomized on a 1:1 basis to receive folinic acid or placebo beginning 24 hours after each methotrexate dose, with the assigned medication given at a dose of 15 mg three times daily on the first day, and once daily on days 3 and 6.
Patients who received a transplant from an unrelated donor were also given anti-thymocyte globulin at a total dose of 15 mg/kg.
Supportive care included filgrastim (Neupogen) 5 mcg/kg from day 7 until neutrophil engraftment, infection prophylaxis, and ursodeoxycholic acid for prevention of veno-occlusive disease.