A recent study has found that a synthetic progesterone drug may have anticancer properties when combined with conventional anti-estrogen treatments for females with breast cancer.
Researchers from the PIONEER trial discovered that adding megestrol acetate, a low-dose progesterone-mimicking medication, to anti-estrogen treatment may help slow tumor growth in postmenopausal women with estrogen receptor-positive (ER+) breast cancer.
The study, published in Nature Cancer, involved 198 participants from 10 hospitals in the United Kingdom. Participants were randomized into three groups: one received only letrozole, a medication that blocks estrogen, while the other two groups received varying doses of megestrol acetate in addition to letrozole.
According to Dr. Esha Sachdev, a breast medical oncologist at MemorialCare Todd Cancer Institute, "These findings could have significant clinical impact by improving treatment adherence while positively impacting tumor control." However, further studies are needed to confirm these results.
**Understanding ER+ Breast Cancer**Most breast cancers (around 75%) are ER-positive, meaning they have strong estrogen receptors. These receptors can stimulate cancer growth when bound to specific substances in the blood.
Anti-estrogen medications are often used to reduce estrogen levels and inhibit cancer growth in individuals with ER+ breast cancer. However, these treatments can also lead to side effects such as hot flashes, bone loss, joint pain, and muscle pain.
**Potential Benefits of Progesterone-Like Drug**The PIONEER trial suggests that megestrol acetate may have two potential mechanisms for reducing tumor growth:
- Improving adherence to adjuvant endocrine therapy by alleviating hot flashes
- Direct antiproliferative effect on tumor cells mediated by reduced ER genomic binding, subsequently antagonizing estrogen signaling
While these findings are promising, further research is needed to confirm the long-term effects of combining megestrol acetate with anti-estrogen treatments for women with breast cancer.
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