Colorectal adenomas in participants of the select randomized trial of selenium and Vitamin E for prostate cancer prevention

Michael P Lance, David S Alberts, Patricia A. Thompson, Liane Fales, Fang Wang, Jerilyn San Jose, Elizabeth T Jacobs, Phyllis J. Goodman, Amy K. Darke, Monica Yee, Lori Minasian, Ian M. Thompson, Denise Roe

Research output: Contribution to journalArticle

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Abstract

Selenium and vitamin E micronutrients have been advocated for the prevention of colorectal cancer. Colorectal adenoma occurrence was used as a surrogate for colorectal cancer in an ancillary study to the Selenium and Vitamin E Cancer Prevention Trial (SELECT) for prostate cancer prevention. The primary objective was to measure the effect of selenium (as selenomethionine) on colorectal adenomas occurrence, with the effect of vitamin E (as a-tocopherol) supplementation on colorectal adenoma occurrence considered as a secondary objective. Participants who underwent lower endoscopy while in SELECT were identified from a subgroup of the 35,533 men randomized in the trial. Adenoma occurrence was ascertained from the endoscopy and pathology reports for these procedures. Relative Risk (RR) estimates and 95% confidence intervals (CI) of adenoma occurrence were generated comparing those randomized to selenium versus placebo and to vitamin E versus placebo based on the full factorial design. Evaluable endoscopy information was obtained for 6,546 participants, of whom 2,286 had 1+ adenomas. Apart from 21 flexible sigmoidoscopies, all the procedures yielding adenomas were colonoscopies. Adenomas occurred in 34.2% and 35.7%, respectively, of participants whose intervention included or did not include selenium. Compared with placebo, the RR for adenoma occurrence in participants randomized to selenium was 0.96 (95% CI, 0.90-1.02; P = 0.194). Vitamin E did not affect adenoma occurrence compared with placebo (RR=1.03; 95% CI, 0.96-1.10; P = 0.38). Neither selenium nor vitamin E supplementation can be recommended for colorectal adenoma prevention.

Original languageEnglish (US)
Pages (from-to)45-54
Number of pages10
JournalCancer Prevention Research
Volume10
Issue number1
DOIs
StatePublished - Jan 1 2017

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Selenium
Vitamin E
Adenoma
Prostatic Neoplasms
Placebos
Endoscopy
Confidence Intervals
Colorectal Neoplasms
Selenomethionine
Sigmoidoscopy
Tocopherols
Micronutrients
Colonoscopy
Neoplasms
Pathology

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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Colorectal adenomas in participants of the select randomized trial of selenium and Vitamin E for prostate cancer prevention. / Lance, Michael P; Alberts, David S; Thompson, Patricia A.; Fales, Liane; Wang, Fang; Jose, Jerilyn San; Jacobs, Elizabeth T; Goodman, Phyllis J.; Darke, Amy K.; Yee, Monica; Minasian, Lori; Thompson, Ian M.; Roe, Denise.

In: Cancer Prevention Research, Vol. 10, No. 1, 01.01.2017, p. 45-54.

Research output: Contribution to journalArticle

Lance, Michael P ; Alberts, David S ; Thompson, Patricia A. ; Fales, Liane ; Wang, Fang ; Jose, Jerilyn San ; Jacobs, Elizabeth T ; Goodman, Phyllis J. ; Darke, Amy K. ; Yee, Monica ; Minasian, Lori ; Thompson, Ian M. ; Roe, Denise. / Colorectal adenomas in participants of the select randomized trial of selenium and Vitamin E for prostate cancer prevention. In: Cancer Prevention Research. 2017 ; Vol. 10, No. 1. pp. 45-54.
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abstract = "Selenium and vitamin E micronutrients have been advocated for the prevention of colorectal cancer. Colorectal adenoma occurrence was used as a surrogate for colorectal cancer in an ancillary study to the Selenium and Vitamin E Cancer Prevention Trial (SELECT) for prostate cancer prevention. The primary objective was to measure the effect of selenium (as selenomethionine) on colorectal adenomas occurrence, with the effect of vitamin E (as a-tocopherol) supplementation on colorectal adenoma occurrence considered as a secondary objective. Participants who underwent lower endoscopy while in SELECT were identified from a subgroup of the 35,533 men randomized in the trial. Adenoma occurrence was ascertained from the endoscopy and pathology reports for these procedures. Relative Risk (RR) estimates and 95{\%} confidence intervals (CI) of adenoma occurrence were generated comparing those randomized to selenium versus placebo and to vitamin E versus placebo based on the full factorial design. Evaluable endoscopy information was obtained for 6,546 participants, of whom 2,286 had 1+ adenomas. Apart from 21 flexible sigmoidoscopies, all the procedures yielding adenomas were colonoscopies. Adenomas occurred in 34.2{\%} and 35.7{\%}, respectively, of participants whose intervention included or did not include selenium. Compared with placebo, the RR for adenoma occurrence in participants randomized to selenium was 0.96 (95{\%} CI, 0.90-1.02; P = 0.194). Vitamin E did not affect adenoma occurrence compared with placebo (RR=1.03; 95{\%} CI, 0.96-1.10; P = 0.38). Neither selenium nor vitamin E supplementation can be recommended for colorectal adenoma prevention.",
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