In this article, we will discuss about Letrozole (Dosage Overview). So, let’s get started.
Adjuvant Treatment of Early Breast Cancer
Letrozole is indicated for the adjuvant treatment of postmenopausal women with hormone receptor positive early breast cancer.
Extended Adjuvant Treatment of Early Breast Cancer
Letrozole is indicated for the extended adjuvant treatment of early breast cancer in postmenopausal women, who have received 5 years of adjuvant tamoxifen therapy. The effectiveness of Letrozole in extended adjuvant treatment of early breast cancer is based on an analysis of disease-free survival in patients treated with Letrozole for a median of 60 months.
First and Second-Line Treatment of Advanced Breast Cancer
Letrozole is indicated for first-line treatment of postmenopausal women with hormone receptor positive or unknown, locally advanced or metastatic breast cancer. Femara is also indicated for the treatment of advanced breast cancer in postmenopausal women with disease progression following antiestrogen therapy.
The recommended dose of Letrozole is one 2.5 mg tablet administered once a day, without regard to meals.
Use in Adjuvant Treatment of Early Breast Cancer
In the adjuvant setting, the optimal duration of treatment with letrozole is unknown. The planned duration of treatment in the study was 5 years with 73% of the patients having completed adjuvant therapy. Treatment should be discontinued at relapse.
Use in Extended Adjuvant Treatment of Early Breast Cancer
In the extended adjuvant setting, the optimal treatment duration with Femara is not known. The planned duration of treatment in the study was 5 years. In the final updated analysis, conducted at a median follow-up of 62 months, the median treatment duration was 60 months. Seventy-one percent of patients were treated for at least 3 years and 58% of patients completed least 4.5 years of extended adjuvant treatment. The treatment should be discontinued at tumor relapse.
Use in First and Second-Line Treatment of Advanced Breast Cancer
In patients with advanced disease, treatment with Letrozole should continue until tumor progression is evident.
Use in Hepatic Impairment
No dosage adjustment is recommended for patients with mild to moderate hepatic impairment, although Letrozole blood concentrations were modestly increased in subjects with moderate hepatic impairment due to cirrhosis. The dose of Letrozole in patients with cirrhosis and severe hepatic dysfunction should be reduced by 50%. The recommended dose of Letrozole for such patients is 2.5 mg administered every other day. The effect of hepatic impairment on Letrozole exposure in noncirrhotic cancer patients with elevated bilirubin levels has not been determined.
Use in Renal Impairment
No dosage adjustment is required for patients with renal impairment if creatinine clearance is ≥10 mL/min.