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Renata PLCProduct Description
Letrozole is a potent, non-steroidal third-generation aromatase inhibitor used primarily in the treatment of hormone receptor-positive breast cancer in postmenopausal women. It functions by competitively and reversibly binding to the heme group of the aromatase enzyme (CYP19A1), which is responsible for the final rate-limiting step in estrogen biosynthesis—the conversion of androgens into estrogens in peripheral tissues. By profoundly reducing systemic estrogen levels, letrozole deprives estrogen-dependent tumor cells of their primary growth stimulus. Beyond oncology, it is frequently utilized off-label in reproductive medicine to induce ovulation in women with polycystic ovary syndrome (PCOS) or unexplained infertility, as the temporary reduction in estrogen triggers a compensatory increase in follicle-stimulating hormone (FSH) secretion. Common side effects associated with its use include hot flashes, joint pain (arthralgia), and an increased risk of bone density loss, necessitating periodic monitoring of bone mineral health during long-term therapy.
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