Plasma 1,25-dihydroxy- and 25-hydroxyvitamin D and adenomatous polyps of the distal colorectum

Elizabeth A. Platz, Susan E. Hankinson, Bruce W. Hollis, Graham A. Colditz, David J. Hunter, Frank E. Speizer, Edward Giovannucci

Research output: Contribution to journalArticle

Abstract

1,25-dihydroxyvitamin D [1,25(OH)2D] inhibits proliferation and promotes differentiation of human colon cancer cell lines. Epidemiological findings, although not entirely consistent, suggest an inverse relationship between vitamin D intake and colorectal cancer and adenoma, colorectal cancer precursor lesions. We evaluated the relationship of plasma 1,25(OH)2D and 25-hydroxyvitamin D [25(OH)D] with distal colorectal adenoma among 326 matched case and control pairs (nested in the prospective Nurses' Health Study), who provided blood in 1989-1990 and who underwent endoscopy in 1989-1996. Plasma vitamin D metabolite concentrations were determined blindly by RIA. Odds ratios (ORs) and 95% confidence intervals (CIs) were estimated from multiple conditional logistic regression models. Mean plasma 1,25(OH)2D and 25(OH)D levels did not significantly differ (P = 0.3 and 0.7, respectively) between cases (31.6 ± 8.4 pg/ml and 26.4 ± 10.6 ng/ml, respectively) and controls (32.2 ± 8.6 pg/ml and 26.8 ± 10.2 ng/ml, respectively). However, women whose plasma 1,25(OH)2D concentration was below 26.0 pg/ml (a level typically considered to be below normal) were at increased risk of distal colorectal adenoma (OR, 1.58; 95% CI, 1.03-2.40). Compared with the lowest 1,25(OH)2D quartile, women in the second (OR, 0.64; 95% CI, 0.41-1.02), third (OR, 0.80; 95% CI, 0.50-1.30), or upper (OR, 0.71; 95% CI, 0.43-1.15) quartiles were at a statistically nonsignificant lower risk of adenoma. The relationship was stronger for large/villous adenoma and among those with consistent vitamin D intake over the 10 years prior to blood draw. Compared with women in the lowest quartile, for plasma 25(OH)D, women in the second (OR, 0.64; 95% CI, 0.41-1.00) and third (OR, 0.58; 95% CI, 0.36-0.95) quartiles were at a statistically significantly lower risk of distal colorectal adenoma, but there was no difference in risk in the top quartile (OR, 1.04; 95% CI, 0.66-1.66). We conclude that women who have low levels of circulating 1,25(OH)2D may be at higher risk of distal colorectal adenomas, but additional study is warranted.

Original languageEnglish (US)
Pages (from-to)1059-1065
Number of pages7
JournalCancer Epidemiology Biomarkers and Prevention
Volume9
Issue number10
StatePublished - Jan 1 2000

ASJC Scopus subject areas

  • Epidemiology
  • Oncology

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  • Cite this

    Platz, E. A., Hankinson, S. E., Hollis, B. W., Colditz, G. A., Hunter, D. J., Speizer, F. E., & Giovannucci, E. (2000). Plasma 1,25-dihydroxy- and 25-hydroxyvitamin D and adenomatous polyps of the distal colorectum. Cancer Epidemiology Biomarkers and Prevention, 9(10), 1059-1065.