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The effect of oral 3,3′-diindolylmethane supplementation on the 2:16α-OHE ratio in BRCA1 mutation carriers

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Abstract

Hormonal exposures are known to influence breast cancer risk among women with a BRCA1 mutation. Thus, dietary factors that increase the 2-hydroxyestrone (OHE):16α-OHE ratio, a biomarker inversely related to breast cancer development, may also influence cancer risk. We conducted a dietary intervention study to evaluate the ability of 300 mg/day of 3,3′-diindolylmethane (DIM) to increase the urinary 2:16α-OHE ratio in 20 women with a BRCA1 mutation. BRCA1 mutation carriers (n = 15) were assigned to receive 300 mg/day of Rx Balance BioREsponse DIM for 4–6 weeks (intervention group) and five BRCA1 mutation carriers did not take DIM (control group). The urinary 2:16α-OHE ratio was assessed at baseline and after 4–6 weeks by immunoassay. There was no significant effect of DIM on the 2:16α-OHE ratio (2.4 at baseline vs. 3.0 after the intervention, P = 0.35). A short dietary intervention with DIM did not significantly increase the 2:16α-OHE ratio in female BRCA1 mutation carriers. Larger studies investigating the effect of dietary or lifestyle interventions on circulating hormone levels in these high-risk women are warranted.

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Acknowledgments

We would also like to acknowledge the study coordinators Chantelle Vernon and Mitra Mohammadi who helped with the data collection and data entry. Joanne Kotsopoulos is the recipient of a Cancer Care Ontario Research Chair in Population Studies and a Canadian Cancer Society Career Development Award in Prevention. Steven Narod is the recipient of a Canada Research Chair tier I. This study was supported by a Grant from the Art for Cancer Foundation. We would also like to thank Dr. Michael Zeligs (Bioresponse) for providing the DIM.

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The authors declare that they have no conflict of interest.

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Correspondence to Joanne Kotsopoulos.

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Nikitina, D., Llacuachaqui, M., Sepkovic, D. et al. The effect of oral 3,3′-diindolylmethane supplementation on the 2:16α-OHE ratio in BRCA1 mutation carriers. Familial Cancer 14, 281–286 (2015). https://doi.org/10.1007/s10689-015-9783-2

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