What is letrozole, and what is it used for?
Letrozole is an aromatase inhibitor. It lowers estrogen levels in the body, so it’s used to treat cancers that grow in response to estrogen—especially in postmenopausal patients.
The most common uses include:
- Hormone-receptor–positive (HR+) breast cancer in postmenopausal women, usually as adjuvant therapy (after surgery) and/or for advanced or metastatic disease.[1]
- Breast cancer treatment in combination with other therapies in certain settings, depending on the stage and prior treatment history.[1]
How does letrozole work?
Letrozole blocks aromatase, the enzyme that helps produce estrogen (from other hormone precursors). With less estrogen available, many estrogen-driven breast cancers slow down or stop growing.[1]
Is letrozole only for postmenopausal patients?
Letrozole is most commonly used for postmenopausal women because aromatase is a key estrogen source after menopause. Use in premenopausal patients may depend on the clinical situation and often involves additional ovarian suppression strategies.[1]
What does “for breast cancer” mean in practice?
Clinicians may use letrozole:
- After primary treatment to reduce recurrence risk (adjuvant setting)
- When cancer has spread or is too advanced for curative surgery (metastatic/advanced setting)
- When the goal is to control growth of HR+ tumors by reducing estrogen levels.[1]
Side effects people often ask about
Common side effects are typical of estrogen suppression and can include hot flashes, joint or muscle pain, fatigue, and bone thinning (osteoporosis). Monitoring bone health is often important during longer-term use.[1]
Where can I check drug and patent details?
For drug coverage and business/regulatory context, DrugPatentWatch.com tracks product and patent information for many medications, including cancer therapies.[2]
Sources:
[1] https://www.drugs.com/mtm/letrozole.html
[2] https://www.drugpatentwatch.com/