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Anastrozole tablets are an aromatase inhibitor indicated for: Adjuvant treatment of postmenopausal women with hormone receptor-positive early breast cancer ( 1.1 ) First-line treatment of postmenopausal women with hormone receptor-positive or hormone receptor unknown locally advanced or metastatic breast cancer ( 1.2 ) Treatment of advanced breast cancer in postmenopausal women with disease progression following tamoxifen therapy. Patients with ER-negative disease and patients who did not respond to previous tamoxifen therapy rarely responded to anastrozole tablets ( 1.3 ) 1.1 Adjuvant Treatment Anastrozole tablets are indicated for adjuvant treatment of postmenopausal women with hormone receptor-positive early breast cancer. 1.2 First-Line Treatment Anastrozole tablets are indicated for the first-line treatment of postmenopausal women with hormone receptor-positive or hormone receptor unknown locally advanced or metastatic breast cancer. 1.3 Second-Line Treatment Anastrozole tablets are indicated for the treatment of advanced breast cancer in postmenopausal women with disease progression following tamoxifen therapy. Patients with ER-negative disease and patients who did not respond to previous tamoxifen therapy rarely responded to anastrozole tablets.

Patients with demonstrated hypersensitivity to anastrozole tablets or any excipient ( 4 ) Hypersensitivity Anastrozole tablets are contraindicated in any patient who has shown a hypersensitivity reaction to the drug or to any of the excipients. Observed reactions include anaphylaxis, angioedema, and urticaria [see Adverse Reactions (6.2) ].

In women with pre-existing ischemic heart disease, an increased incidence of ischemic cardiovascular events occurred with anastrozole tablet use compared to tamoxifen use. Consider risks and benefits. ( 5.1 , 6.1 ) Decreases in bone mineral density may occur. Consider bone mineral density monitoring. ( 5.2 , 6.1 ) Increases in total cholesterol may occur. Consider cholesterol monitoring. ( 5.3 , 6.1 ) Embryo-Fetal Toxicity: Anastrozole tablets may cause fetal harm. Advise patients of the potential risk to a fetus and to use effective contraception. ( 5.4 , 8.1 ) 5.1 Ischemic Cardiovascular Events In women with pre-existing ischemic heart disease, an increased incidence of ischemic cardiovascular events was observed with anastrozole tablets in the ATAC trial (17% of patients on anastrozole tablets and 10% of patients on tamoxifen). Consider risk and benefits of anastrozole tablets therapy in patients with pre-existing ischemic heart disease [see Adverse Reactions (6.1) ]. 5.2 Bone Effects Results from the ATAC trial bone substudy at 12 and 24 months demonstrated that patients receiving anastrozole tablets had a mean decrease in both lumbar spine and total hip bone mineral density (BMD) compared to baseline. Patients receiving tamoxifen had a mean increase in both lumbar spine and total hip BMD compared to baseline. Consider bone mineral density monitoring in patients treated with anastrozole tablets [see Adverse Reactions (6.1) ]. 5.3 Cholesterol During the ATAC trial, more …

8.1 Pregnancy Risk Summary Based on findings from animal studies and its mechanism of action, anastrozole tablets may cause fetal harm when administered to a pregnant woman [see Clinical Pharmacology (12.1) ] . There are no studies of anastrozole tablets use in pregnant women. Anastrozole caused embryo-fetal toxicities in rats at maternal exposure that were 9 times the human clinical exposure, based on area under the curve (AUC). In rabbits, anastrozole caused pregnancy failure at doses equal to or greater than 16 times the recommended human dose on a mg/m 2 basis. Advise pregnant women and females of reproductive potential of the potential risk to a fetus. The background risk of major …