Abstract | PURPOSE: EXPERIMENTAL DESIGN: Genotyping was performed on seven established FMO3 polymorphisms previously shown to have functional relevance-M66I, P153L, E158K, V257M, E305X, E308G, and R492W-in 21 and 20 FAP patients, who received sulindac and placebo, respectively. RESULTS: None of the 41 patients exhibited heterozygous or homozygous M66I and R492W variant alleles, or homozygous P153L, V257M, and E305X variant alleles. Among sulindac-treated patients who did not develop adenomas ("responders"), 4 (33%) were homozygous for E158K and 2 (17%) were homozygous for E308G variant alleles. In contrast, none of the patients on sulindac who developed adenomas ("nonresponders") exhibited homozygosity for either of the two variant alleles. In addition, polymorphisms in the E158K or E308G allele were associated with a significant reduction in mucosal prostanoid levels in patients treated with sulindac. CONCLUSIONS: Polymorphisms in FMO3, particularly at the E158K and E308G loci, may reduce activity in catabolizing sulindac and result in an increased efficacy to prevent polyposis in FAP.
|
Authors | Irfan M Hisamuddin, Mohammad A Wehbi, Ann Chao, Hadley W Wyre, Linda M Hylind, Francis M Giardiello, Vincent W Yang |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research
(Clin Cancer Res)
Vol. 10
Issue 24
Pg. 8357-62
(Dec 15 2004)
ISSN: 1078-0432 [Print] United States |
PMID | 15623613
(Publication Type: Clinical Trial, Comparative Study, Journal Article, Randomized Controlled Trial, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)
|
Chemical References |
- Antineoplastic Agents
- Placebos
- Prostaglandins
- Sulindac
- Oxygenases
- dimethylaniline monooxygenase (N-oxide forming)
|
Topics |
- Adenomatous Polyposis Coli
(diagnosis, enzymology, prevention & control)
- Antineoplastic Agents
(therapeutic use)
- Chemoprevention
- Cohort Studies
- Genotype
- Homozygote
- Humans
- Intestinal Mucosa
(metabolism)
- Oxygenases
(genetics)
- Placebos
- Polymorphism, Genetic
- Prostaglandins
(metabolism)
- Sulindac
(therapeutic use)
|