Comparison of 5-FU versus FUDR activity in human colorectal cancer using an in vitro clonogenic assay (HTCA).
Comparative in vitro drug testing was performed in 72 of 183 surgically removed human colorectal cancer specimens (34 primary lesions, 38 metastases). In 10 of these tumors, comparative dose-response curves were obtained. Given a greater than or equal to 70% ICF (inhibition of colony formation) as threshold for in vitro sensitivity, 5-FU was active in 16/62 specimens, and FUDR in 14/62. Significantly discordant sensitivity results were observed in 8/62 tests, 5-FU being the more active agent in 5 of these cases. These data are supported by the finding of 3 considerably differing dose-response curves in 10 additional comparative studies of human primary tumors.
D003110:Colonic Neoplasms / Q000188:drug therapy*; D003114:Colony-Forming Units Assay; D046508:Culture Techniques; D004305:Dose-Response Relationship, Drug; D005467:Floxuridine / Q000008:administration & dosage / Q000627:therapeutic use*; D005472:Fluorouracil / Q000008:administration & dosage / Q000627:therapeutic use*; D006801:Humans; D012004:Rectal Neoplasms / Q000188:drug therapy*; D014410:Tumor Stem Cell Assay
D005467:Floxuridine; D005472:Fluorouracil