Letrozole – a powerful therapy that works by lowering estrogen levels, reshaping treatment approaches in breast cancer and beyond.
FDA approval-July 25, 1997
Brand name– Femara
Medicinal form– oral tablet
Active component– 4,4′-[(1H-1,2,4-triazol-1-yl)-methylene]bis-benzonitrile
Who should not take the drug?
- Pregnant ladies
- Lactating ladies
- Fertile males and females
- Children
Mechanism of Action
Certain cancers, like breast cancer, thrive on estrogen, the female hormone, just like how prostate cancer cells thrive on testosterone. If you are in your early fifties (post-menopausal stage), estrogen is not produced by the ovaries. It is instead produced by an enzyme, Aromatase, which converts natural androgens into estrogen.
Letrozole steps in here. As a non-steroid aromatase inhibitor, it blocks Aromatase, starving normal and cancer cells of estrogen. Due to this mechanism, this drug has extensive uses in the treatment of breast cancer and also in certain cases of infertility and ectopic pregnancy.
Latest research
- Letrozole- a new hope for women with Poor Ovarian Response in IVF
A recent trial tested a stop GnRH agonist + letrozole protocol in women with poor ovarian response (POR) undergoing IVF. The letrozole-based approach produced more mature eggs and higher-quality embryos compared to conventional stimulation. While pregnancy rates were similar, the results suggest that letrozole may help improve IVF outcomes for this challenging patient group. Larger studies need to confirm these findings.
2. Repurposing Letrozole: A Potential Brain Cancer Game-Changer
Researchers are exploring letrozole as a potential therapy for glioblastoma (GBM). In early studies, letrozole enters GBM tissue and affects cell cycle genes. Combined with the CDK4/6 inhibitor ribociclib, it enhances DNA damage, cell cycle arrest, and apoptosis in GBM cells, showing strong synergy. These findings suggest that letrozole, repurposed with ribociclib, could offer a promising new approach for GBM treatment, pending further clinical trials.
3. Letrozole Helps Overcome IVF Challenges in PCOS Patients with High LH
A case report highlighted a PCOS patient with high basal LH who failed standard IVF protocols. Using a progestin-primed ovarian stimulation protocol combined with letrozole, she achieved a successful pregnancy and a healthy birth. This suggests that letrozole can be a valuable tool in tailored IVF strategies for PCOS patients, even when bLH is elevated, though further research is needed.
Letrozole continues to show promise across multiple areas, from cancer treatment to fertility, making it a drug worth watching.
Thanks for sharing.