LetroBoon Tablet

Letrozole tablet is an aromatase inhibitor indicated for: Adjuvant treatment of postmenopausal women with hormone receptor positive early breast cancer Extended adjuvant treatment of postmenopausal women with early breast cancer who have received prior standard adjuvant tamoxifen therapy First and second-line treatment of postmenopausal women with hormone receptor positive or unknown advanced breast cancer Adjuvant Treatment of Early Breast Cancer Letrozole tablets are indicated for the adjuvant treatment of postmenopausal women with hormone receptor positive early breast cancer. Extended Adjuvant Treatment of Early Breast Cancer Letrozole tablets are 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 tablets in extended adjuvant treatment of early breast cancer is based on an analysis of disease-free survival (DFS) in patients treated with Letrozole tablets for a median of 60 months. First and Second-Line Treatment of Advanced Breast Cancer Letrozole tablets are indicated for first-line treatment of postmenopausal women with hormone receptor positive or unknown, locally advanced or metastatic breast cancer. Letrozole tablets are also indicated for the treatment of advanced breast cancer in postmenopausal women with disease progression following antiestrogen therapy.

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Source: US FDA prescribing information, via openFDA. Provided for general information only — it is not a substitute for your doctor's or pharmacist's advice. Always follow your prescriber's instructions.

Decreases in bone mineral density may occur. Consider bone mineral density monitoring Increases in total cholesterol may occur. Consider cholesterol monitoring. Fatigue, dizziness and somnolence may occur. Exercise caution when operating machinery Embryo-Fetal Toxicity: Can cause fetal harm when administered to pregnant women. Obtain a pregnancy test in females of reproductive potential. Advise females of reproductive potential to use effective contraception Bone Effects Use of Letrozole may cause decreases in bone mineral density (BMD). Consideration should be given to monitoring BMD. Results of a safety study to evaluate safety in the adjuvant setting comparing the effect on lumbar spine (L2-L4) BMD of adjuvant treatment with Letrozole to that with tamoxifen showed at 24 months a median decrease in lumbar spine BMD of 4.1% in the Letrozole arm compared to a median increase of 0.3% in the tamoxifen arm (difference = 4.4%) ( P <0.0001). Updated results from the BMD substudy (MA-17B) in the extended adjuvant setting demonstrated that at 2 years patients receiving Letrozole had a median decrease from baseline of 3.8% in hip BMD compared to a median decrease of 2.0% in the placebo group. The changes from baseline in lumbar spine BMD in Letrozole and placebo treated groups were not significantly different. In the adjuvant trial (BIG 1 to 98) the incidence of bone fractures at any time after randomization was 14.7% for Letrozole and 11.4% for tamoxifen at a median follow-up of 96 months. The incidence of osteoporosis was 5.1% for Letrozole and 2.7% for tamoxifen. In the extended adjuvant trial (MA-17), the incidence of bone fractures at any time after randomization was 13.3% for Letrozole and 7.8% for placebo at a median follow-up of 62 months. The incidence of new osteoporosis was 14.5% for Letrozole and 7.8% for placebo. Cholesterol Consideration should be given to monitoring serum cholesterol. In the adjuvant trial (BIG 1 to 98), hypercholesterolemia was reported in 52.3% of Letrozole patients and 28.6% of tamoxifen patients. Grade 3 to 4 hypercholesterolemia was reported in 0.4% of Letrozole patients and 0.1% of tamoxifen patients. Also in the adjuvant setting, an increase of greater than or equal to 1.5 x upper limit of normal (ULN) in total cholesterol (generally nonfasting) was observed in patients on monotherapy who had baseline total serum cholesterol within the normal range (i.e., less than=1.5 x ULN) in 155/1843 (8.4%) patients on Letrozole vs 71/1840 (3.9%) patients on tamoxifen. Lipid lowering medications were required for 29% of patients on Letrozole and 20% on tamoxifen. Abridged from the full prescribing information.

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Source: US FDA prescribing information, via openFDA. Provided for general information only — it is not a substitute for your doctor's or pharmacist's advice. Always follow your prescriber's instructions.

The following adverse reactions are discussed in greater detail in other sections of the labeling. Bone effects Increases in cholesterol Fatigue and Dizziness The most common adverse reactions (greater than 20%) were hot flashes, arthralgia; flushing, asthenia, edema, arthralgia, headache, dizziness, hypercholesterolemia, sweating increased, bone pain and musculoskeletal. Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reactions rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Adjuvant Treatment of Early Breast Cancer In study, BIG 1 to 98, the median treatment duration of adjuvant treatment was 60 months and the median duration of follow-up for safety was 96 months for patients receiving Letrozole and tamoxifen. Certain adverse reactions were prospectively specified for analysis (see Table 1), based on the known pharmacologic properties and side effect profiles of the two drugs. Adverse reactions were analyzed irrespective of whether a symptom was present or absent at baseline. Most adverse reactions reported (approximately 75% of patients who reported AEs) were Grade 1 or Grade 2 applying the Common Toxicity Criteria (CTC) Version 2.0/ Common Terminology Criteria for Adverse Events (CTCAE), Version 3.0. Table 1 describes adverse reactions (Grades 1-4 and Grades 3-4) irrespective of relationship to study treatment in the adjuvant trial for the monotherapy arms analysis (safety population). Table 1: Patients With Adverse Reactions (CTC Grades 1 to 4) in the Adjuvant Study – Monotherapy Arms Analysis (Median Follow-up 96 Months; Abridged from the full prescribing information.

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Source: US FDA prescribing information, via openFDA. Provided for general information only — it is not a substitute for your doctor's or pharmacist's advice. Always follow your prescriber's instructions.