CDA and neoplasm: Capecitabine (Xeloda®; Hoffmann La Roche) is an orally administered fluoropyrimidine carbamate, metabolised in liver and tumour by carboxylesterases and cytidine deaminase to 5′-deoxy-5-fluorocytidine (5′-DFCR) and 5′-deoxy-5-fluorouridine (5′-DFUR) respectively.