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Erschienen in: Breast Cancer Research and Treatment 1/2019

22.11.2018 | Review

Safety of 5α-reductase inhibitors and spironolactone in breast cancer patients receiving endocrine therapies

verfasst von: Raquel N. Rozner, Azael Freites-Martinez, Jerry Shapiro, Eliza B. Geer, Shari Goldfarb, Mario E. Lacouture

Erschienen in: Breast Cancer Research and Treatment | Ausgabe 1/2019

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Abstract

Purpose

To provide dermatologists and oncologists with a foundation for practical understanding and uses of 5α-reductase inhibitors and spironolactone for breast cancer patients and survivors receiving endocrine therapies (ETs), including the effect of these treatments on sex hormone levels, any reported drug interactions, and any risk of malignancy.

Methods

All published studies from January 1978 through April 2018 were considered, using databases such as PubMed, Google Scholar, and Science Direct. Forty-seven studies were included in this review.

Results

There is no evidence of interactions between 5α-reductase inhibitors and spironolactone with ETs used in breast cancer. Sex hormone alteration with 5α-reductase inhibitor or spironolactone use is variable. Three randomized controlled trials, 1 case–control study, and 6 retrospective cohort studies, including 284 female patients, studied the effects of 5α-reductase inhibitors on serum estrogen levels. Levels were increased in 97 of 284 (34%) patients, decreased in 15 of 284 (5.3%) patients, and unchanged in 162 of 284 (57%) patients. Four retrospective cohort studies, 1 case study, and 1 double-blinded crossover study, including 95 female patients, assessed the effect of spironolactone on estrogen levels. Levels were increased in 25 of 95 (26%) patients, decreased in 6 of 95 (6.3%) patients, and unchanged in 64 of 95 (67%) patients. Ultimately, most patients did not have a significant alteration in the level of estrogen when using 5α-reductase inhibitors or spironolactone. No consistent evidence of increased risk of female breast cancer while on spironolactone was reported in 3 studies including 49,298 patients; the risk of breast cancer with the use of 5α-reductase inhibitors has not been studied.

Conclusions

Most patients did not show increased estrogen levels with spironolactone and there were no data suggesting increased risk of breast cancer. Based on hormonal and pharmacological activity, spironolactone may be considered for further research on alopecia and hirsutism in breast cancer patients.
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Metadaten
Titel
Safety of 5α-reductase inhibitors and spironolactone in breast cancer patients receiving endocrine therapies
verfasst von
Raquel N. Rozner
Azael Freites-Martinez
Jerry Shapiro
Eliza B. Geer
Shari Goldfarb
Mario E. Lacouture
Publikationsdatum
22.11.2018
Verlag
Springer US
Erschienen in
Breast Cancer Research and Treatment / Ausgabe 1/2019
Print ISSN: 0167-6806
Elektronische ISSN: 1573-7217
DOI
https://doi.org/10.1007/s10549-018-4996-3

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