Journal
ANTI-CANCER AGENTS IN MEDICINAL CHEMISTRY
Volume 9, Issue 5, Pages 481-499Publisher
BENTHAM SCIENCE PUBL LTD
DOI: 10.2174/187152009788451833
Keywords
Breast cancer; osteoporosis; estrogen receptor; tamoxifen; raloxifene; SERMs; endocrine therapy; drug resistance
Categories
Funding
- Department of Defense Breast Program [BC050277]
- NIH [P30 CA006927]
- Genuardi's Fund
- Weg Fund of Fox Chase Cancer Center
- Hollenbach Family Fund
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Estrogen plays vital roles in human health and diseases. Estrogen mediates its actions almost entirely by binding to estrogen receptors ( ER), alpha and beta which further function as transcription factors. Selective estrogen receptor modulators ( SERMs) are synthetic molecules which bind to ER and can modulate its transcriptional capabilities in different ways in diverse estrogen target tissues. Tamoxifen, the prototypical SERM, is extensively used for targeted therapy of ER positive breast cancers and is also approved as the first chemo-preventive agent for lowering breast cancer incidence in high risk women. The therapeutic and preventive efficacy of tamoxifen was initially proven by series of experiments in the laboratory which laid the foundation of its clinical use. Unfortunately, use of tamoxifen is associated with de-novo and acquired resistance and some undesirable side effects. The molecular study of the resistance provides an opportunity to precisely understand the mechanism of SERM action which may further help in designing new and improved SERMs. Recent clinical studies reveal that another SERM, raloxifene, which is primarily used to treat post-menopausal osteoporosis, is as efficient as tamoxifen in preventing breast cancers with fewer side effects. Overall, these findings open a new horizon for SERMs as a class of drug which not only can be used for therapeutic and preventive purposes of breast cancers but also for various other diseases and disorders. Major efforts are therefore directed to make new SERMs with a better therapeutic profile and fewer side effects.
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