title: [Effect of delayed-release 5-fluorouracil implants on colorectal cancer].
abstract: OBJECTIVE
  To study the antitumor effect of peri-tumor implantation of delayed-release 5-fluorouracil implants on xenograft colorectal tumor in mice.
  
  
  METHODS
  Fifty tumor-bearing nude mice were randomly divided into 5 groups. Group A and B were treated with peri-tumor implantation of 5-fluorouracil implants and the dose of 5-fluorouracil was 200 and 100 mg/kg, respectively. Group C and D were treated with peri-tumor injection of 5-fluorouracil solution and the dose of 5-fluorouracil was 200 and 100 mg/kg, respectively. Group E did not receive any treatment. A growth curve was plotted for changes in tumor volume, the weight of the tumor was measured and tumor inhibition rate was calculated.
  
  
  RESULTS
  The growth curve was mild in group A and B and steep in group C, D and E. There were statistical differences in tumor volume between groups A and B and other groups and there were no statistical differences in tumor volume among group C, D and E. After 12 days, tumor inhibition rate was 72% in group A, 51% in group B, 8% in group C, and 5% in group C. There were statistical differences in inhibition rate between group A, B and C, D (P<0.05). The weight changes before and after the treatment among the 5 groups were not statistically different. During the study, 1 mouse in group A died, 4 in group C and 1 in group D.
  
  
  CONCLUSIONS
  Delayed-release 5-fluorouracil implants can effectively inhibit tumor growth.
authors.affiliation: Department of General Surgery, General Hospital of Chinese PLA, Beijing 100853, China.
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
authors.forename: Lin
authors.initials: L
authors.lastname: Chen
authors.forename: Bo
authors.initials: B
authors.lastname: Wei
authors.forename: Bai-Shi
authors.initials: BS
authors.lastname: Wang
authors.forename: Jing-Quan
authors.initials: JQ
authors.lastname: Li
authors.forename: Wei
authors.initials: W
authors.lastname: Zheng
mesh_terms: D000818:Animals; D000964:Antimetabolites, Antineoplastic / Q000008:administration & dosage*; D015179:Colorectal Neoplasms / Q000188:drug therapy*; D003692:Delayed-Action Preparations; D005260:Female; D005472:Fluorouracil / Q000008:administration & dosage*; D008297:Male; D051379:Mice; D008819:Mice, Nude; D023041:Xenograft Model Antitumor Assays
chemical_list: D000964:Antimetabolites, Antineoplastic; D003692:Delayed-Action Preparations; D005472:Fluorouracil