Calcium supplements and colorectal adenomas. Polyp Prevention Study Group.

Abstract:

:Experimental and observational findings suggest that calcium intake may protect against colorectal neoplasia. To investigate this hypothesis, we conducted a randomized, double-blind trial of colorectal adenoma recurrence. Nine hundred thirty patients with a recent history of colorectal adenomas were randomly given calcium carbonate (3 gm daily; 1200 mg elemental calcium) or placebo, with follow-up colonoscopies one and four years after the qualifying examination. The main analysis focused on new adenomas found after the first follow-up endoscopy, up to (and including) the second follow-up examination. Risk ratios of at least one recurrent adenoma and ratios of the average numbers of adenomas were calculated as measures of calcium effect. There was a lower risk of recurrent adenomas in subjects assigned calcium. Eight hundred thirty-two patients had two follow-up examinations and were included in the main analysis; the adjusted risk ratio of one or more adenomas was 0.81 (95% CI 0.67 to 0.99); the adjusted ratio of the average numbers of adenomas was 0.76 (95% CI 0.60 to 0.96). Among subjects who had at least one follow-up colonoscopy, the adjusted risk ratio of one or more recurrent adenomas was 0.85 (95% CI 0.74 to 0.98). The effect of calcium seemed independent of initial dietary fat and calcium intake. No toxicity was associated with supplementation. These findings indicate that calcium supplementation has a modest protective effect against colorectal adenomas, precursors of most colorectal cancers.

journal_name

Ann N Y Acad Sci

authors

Baron JA,Beach M,Mandel JS,van Stolk RU,Haile RW,Sandler RS,Rothstein R,Summers RW,Snover DC,Beck GJ,Frankl H,Pearson L,Bond JH,Greenberg ER

doi

10.1111/j.1749-6632.1999.tb08731.x

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

138-45

eissn

0077-8923

issn

1749-6632

journal_volume

889

pub_type

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