title: Changes in serum carotenoids in subjects with colorectal adenomas after 24 mo of beta-carotene supplementation. Australian Polyp Prevention Project Investigators.
abstract: The effect of beta-carotene supplementation on major serum carotenoid fractions (lutein/zeaxanthin, beta-cryptoxanthin, lycopene, alpha-carotene, and beta-carotene) was investigated in 224 people with colorectal adenomas (139 men, 85 women) recruited for the Australian Polyp Prevention Project (APPP). Each subject was randomly assigned to take either 20 mg beta-carotene/d or placebo over 24 mo. Besides the expected increase in serum concentration of beta-carotene (1073% in men, 839% in women), lycopene (176% in men) and alpha-carotene (211% in men and 166% in women) concentrations were also increased after body mass index, baseline concentration, change in respective carotenoid intake, and other confounding factors were adjusted for. The increase in serum concentrations of these carotenoids after beta-carotene supplementation suggests that beta-carotene may interact biologically with other carotenoids and such interaction would need to be taken into consideration when the protective effect of beta-carotene supplementation for cancer or other diseases is examined.
authors.affiliation: Department of Medicine, Monash Medical Centre, Monash University, Clayton, Australia.
authors.forename: M L
authors.initials: ML
authors.lastname: Wahlqvist
authors.forename: N
authors.initials: N
authors.lastname: Wattanapenpaiboon
authors.forename: F A
authors.initials: FA
authors.lastname: Macrae
authors.forename: J R
authors.initials: JR
authors.lastname: Lambert
authors.forename: R
authors.initials: R
authors.lastname: MacLennan
authors.forename: B H
authors.initials: BH
authors.lastname: Hsu-Hage
mesh_terms: D000236:Adenoma / Q000097:blood*; D000328:Adult; D000368:Aged; D015992:Body Mass Index; D002338:Carotenoids / Q000008:administration & dosage / Q000031:analogs & derivatives / Q000097:blood* / Q000494:pharmacology* / Q000627:therapeutic use; D015179:Colorectal Neoplasms / Q000097:blood*; D065366:Cryptoxanthins; D004041:Dietary Fats / Q000008:administration & dosage; D004311:Double-Blind Method; D002149:Energy Intake; D005260:Female; D006801:Humans; D008055:Lipids / Q000097:blood; D014975:Lutein / Q000097:blood; D000077276:Lycopene; D008297:Male; D008875:Middle Aged; D010919:Placebos; D024341:Xanthophylls; D065146:Zeaxanthins; D019207:beta Carotene
chemical_list: D065366:Cryptoxanthins; D004041:Dietary Fats; D008055:Lipids; D010919:Placebos; D024341:Xanthophylls; D065146:Zeaxanthins; D019207:beta Carotene; D002338:Carotenoids; C041635:alpha-carotene; D000077276:Lycopene; D014975:Lutein