https://www.selleckchem.com/pr....oducts/pf-3644022.ht
There is a need of comparative studies to understand the differences in term of efficacy and safety of drugs with different mechanisms of action but similar therapeutic indications. This requires changes in the European Legislation of criteria for drug approval. Standard dosages of fluoropyrimidine chemotherapy result in severe toxicity in a substantial proportion of patients, however, routine pre-therapeutic toxicity prediction remains uncommon. A thymine (THY) challenge test can discriminate risk of severe gastrointestinal toxicity
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