New Research Suggests Progesterone-Like Drug May Help Slow Breast Cancer Tumor Growth
A recent study has found that a synthetic progesterone drug, already used to manage hot flashes in females with breast cancer, may also help slow tumor growth. The study, known as the PIONEER trial, involved 198 postmenopausal women with estrogen receptor-positive (ER-positive) breast cancer.
Researchers discovered that combining this synthetic progesterone drug, megestrol acetate, with conventional anti-estrogen treatments may have a direct anticancer effect. This finding could potentially improve treatment adherence and tumor control for patients with ER-positive breast cancer.
About the Study
The PIONEER trial was conducted at 10 hospitals in the United Kingdom and involved postmenopausal women with ER-positive breast cancer who were experiencing hot flashes as a side effect of anti-estrogen treatment. The participants were randomized into three groups:
- Received letrozole, a medication that blocks estrogen
- Received megestrol acetate in addition to letrozole
- Received a placebo in addition to letrozole
The results of the study were recently published in Nature Cancer and suggest that megestrol acetate may have both indirect and direct anticancer effects. Further research is needed to confirm these findings and their potential impact on long-term outcomes for women with breast cancer.
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