E Villafranca et al.
Journal of clinical oncology : official journal of the American Society of Clinical Oncology, 19(6), 1779-1786 (2001-03-17)
Thymidylate synthase (TS) is an important target enzyme for the fluoropyrimidines. TS gene promoter possesses regulatory tandemly repeated (TR) sequences that are polymorphic in humans, depending on ethnic factors. These polymorphisms have been reported to influence TS expression. TS expression