As the precordial pain in this patient was considered to have been due to 5-FU-induced cardiotoxicity , the administration of 5-FU was abandoned .
O O B-DiseaseOrPhenotypicFeature I-DiseaseOrPhenotypicFeature O O B-OrganismTaxon O O O O O O O B-ChemicalEntity B-DiseaseOrPhenotypicFeature O O O O B-ChemicalEntity O O O