Soy isoflavone supplementation for breast cancer risk reduction: a randomized phase II trial.

Abstract

Soy isoflavone consumption may protect against breast cancer development. We conducted a phase IIB trial of soy isoflavone supplementation to examine its effect on breast epithelial proliferation and other biomarkers in the healthy high-risk breast. One hundred and twenty-six consented women underwent a random fine-needle aspiration (rFNA); those with 4,000 or more epithelial cells were randomized to a double-blind 6-month intervention of mixed soy isoflavones (PTIG-2535) or placebo, followed by repeat rFNA. Cells were examined for Ki-67 labeling index and atypia. Expression of 28 genes related to proliferation, apoptosis, and estrogenic effect was measured using quantitative reverse transcriptase PCR. Hormone and protein levels were measured in nipple aspirate fluid (NAF). All statistical tests were two-sided. Ninety-eight women were evaluable for Ki-67 labeling index. In 49 treated women, the median Ki-67 labeling index was 1.18 at entry and 1.12 post intervention, whereas in 49 placebo subjects, it was 0.97 and 0.92 (P for between-group change: 0.32). Menopausal stratification yielded similar results between groups, but within premenopausal soy-treated women, Ki-67 labeling index increased from 1.71 to 2.18 (P = 0.04). We saw no treatment effect on cytologic atypia or NAF parameters. There were significant increases in the expression of 14 of 28 genes within the soy, but not the control group, without significant between-group differences. Plasma genistein values showed excellent compliance. A 6-month intervention of mixed soy isoflavones in healthy, high-risk adult Western women did not reduce breast epithelial proliferation, suggesting a lack of efficacy for breast cancer prevention and a possible adverse effect in premenopausal women.

• Authors: Seema A Khan, Robert T Chatterton, Nancy Michel, Michelle Bryk, Oukseub Lee, David Ivancic, Richard Heinz, Carola M Zalles, Irene B Helenowski, Borko D Jovanovic, Adrian A Franke, Maarten C Bosland, Jun Wang, Nora M Hansen, Kevin P Bethke, Alexander Dew, Margerie Coomes, Raymond C Bergan
• Journal: Cancer prevention research (Philadelphia, Pa.) (Cancer Prev Res (Phila)) Vol. 5 Issue 2 Pg. 309-19 (Feb 2012) ISSN: 1940-6215 [Electronic] United States
• PMID: 22307566 (Publication Type: Clinical Trial, Phase II, Journal Article, Randomized Controlled Trial, Research Support, N.I.H., Extramural)
• Copyright: ©2011 AACR.

Chemical References

• Isoflavones

Topics

• Adult
• Biopsy, Fine-Needle
• Breast Neoplasms (diet therapy, prevention & control)
• Dietary Supplements
• Double-Blind Method
• Female
• Humans
• Isoflavones (administration & dosage)
• Middle Aged
• Prognosis
• Risk Reduction Behavior
• Soybeans (chemistry)