Calcium affects biomarkers of colon carcinogenesis after right hemicolectomy.

Abstract:

BACKGROUND:In Western societies colonic cancer most frequently develops in the distal colon, largely as a result of the composition of the diet. Modulation of dietary factors is therefore an attractive modality to reduce colorectal cancer risk. This study aims to evaluate the potentially protective effects of calcium in right hemicolectomy patients. MATERIALS AND METHODS:A randomized controlled cross-over intervention trial was performed with 1000 mg of elemental calcium per day for 2 months in 15 right hemicolectomy patients. Primary endpoints were proliferative activity, determined by immunohistochemical detection of BrdU-labeled cells (LI) in rectal biopsies, and cytotoxicity and alkaline phosphatase activity of faecal water. Secondary endpoints were bile acid composition in faeces. RESULTS:Calcium-reduced LI in the superficial one-third of the crypt (from 0.84 +/- 0.27% to 0.37 +/- 0.08%, P = 0.04) and a trend towards a lower total LI and LI in the mid one-third of the crypt was observed. Alkaline phosphatase activity was reduced from 6.2 +/- 2.6 U mL-1 in the placebo period to 4.6 +/- 2.2 in the calcium period (P = 0.02), and a trend toward a lower cytotoxicity of faecal water was observed. No effect on total bile acids in faeces was observed, but calcium increased the percentage of deoxycholic acid (from 49.6 +/- 7.0% to 56.5 +/- 6.2%, P = 0.03) and decreased the percentages of cholic acid (from 10.3 +/- 4.7% to 5.8 +/- 2.7%, P = 0.05) and lithocholic acid (from 26.7 +/- 3.4% to 23.9 +/- 2.9%, P = 0.04). CONCLUSION:Calcium may have a protective effect against colorectal cancer risk in right hemicolectomy patients.

journal_name

Eur J Clin Invest

authors

van Gorkom BA,van der Meer R,Karrenbeld A,van der Sluis T,Zwart N,Termont DS,Boersma-van Ek W,de Vries EG,Kleibeuker JH

doi

10.1046/j.1365-2362.2002.01048.x

keywords:

subject

Has Abstract

pub_date

2002-09-01 00:00:00

pages

693-9

issue

9

eissn

0014-2972

issn

1365-2362

journal_volume

32

pub_type

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