PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 22870097-0 2010 Effect of leucovorin on the antitumor efficacy of the 5-FU prodrug, tegafur-uracil, in human colorectal cancer xenografts with various expression levels of thymidylate synthase. Tegafur 68-82 thymidylate synthetase Homo sapiens 156-176