Uridine triacetate, a pyrimidine analogue, has been approved for the emergency treatment of fluorouracil or capecitabine overdoses in adults and children, and for patients who develop “certain severe or life-threatening toxicities within 4 days of receiving” these treatments, the Food and Drug Administration announced on Dec. 11.
Dr. Richard Pazdur
“Today’s approval is a first-of-its-kind therapy that can potentially save lives following overdose or life-threatening toxicity from these chemotherapy agents,” Dr. Richard Pazdur, director of the office of hematology and oncology products in the FDA’s Center for Drug Evaluation and Research, said in the FDA statement. It will be marketed as Vistogard by Wellstat Therapeutics.
Uridine comes in an oral granule formulation that can be mixed into soft foods or, when necessary, administered via a nasogastric or gastrostomy tube, the prescribing information states. The indication is for use after an overdose “regardless of the presence of symptoms,” and for treating “early-onset, severe, or life-threatening toxicity affecting the cardiac or central nervous system, and/or early-onset, unusually severe adverse reactions (e.g., gastrointestinal toxicity and/or neutropenia) within 96 hours following the end of fluorouracil or capecitabine administration,” according to the prescribing information.
Uridine blocks cell damage and cell death caused by fluorouracil chemotherapy, according to the statement, which adds that it is up to the patient’s health care provider to “determine when he or she should return to the prescribed chemotherapy after treatment with Vistogard.”
Uridine was evaluated in two studies of 135 adults and children with cancer, treated with uridine for a fluorouracil or capecitabine overdose, or for early-onset, unusually severe or life-threatening toxicities within 96 hours after receiving fluorouracil (not because of an overdose). Among those treated for an overdose, 97% were alive 30 days after treatment, and among those treated for early-onset severe or life-threatening toxicity, 89% were alive 30 days after treatment. In addition, 33% of the patients resumed chemotherapy within 30 days, according to the FDA statement. Diarrhea, vomiting, and nausea were the most common adverse events associated with treatment.
Uridine was granted orphan drug, priority review, and fast track designations.