•In women with pre-existing ischemic heart disease, an increased incidence of ischemic cardiovascular events occurred with ARIMIDEX use compared to tamoxifen use. Consider risks and benefits. (

5.1 Ischemic Cardiovascular Events

In women with pre-existing ischemic heart disease, an increased incidence of ischemic cardiovascular events was observed with ARIMIDEX in the ATAC trial (17% of patients on ARIMIDEX and 10% of patients on tamoxifen). Consider risk and benefits of ARIMIDEX therapy in patients with pre-existing ischemic heart disease

[see Adverse Reactions (6.1)]

6.1 Clinical Trials Experience

Adjuvant Therapy

Adverse reaction data for adjuvant therapy are based on the ATAC trial

[see Clinical Studies (14.1)]

. The median duration of adjuvant treatment for safety evaluation was 59.8 months and 59.6 months for patients receiving ARIMIDEX 1 mg and tamoxifen 20 mg, respectively.

Adverse reactions occurring with an incidence of at least 5% in either treatment group during treatment or within 14 days of the end of treatment are presented in Table 1.

Table 1 - Adverse reactions occurring with an incidence of at least 5% in either treatment group during treatment, or within 14 days of the end of treatment in the ATAC trialThe combination arm was discontinued due to lack of efficacy benefit at 33 months of follow-up.
Body system and adverse reactions by COSTART preferred term COSTART Coding Symbols for Thesaurus of Adverse Reaction Terms.A patient may have had more than 1 adverse reaction, including more than 1 adverse reaction in the same body system.	ARIMIDEX 1 mg (N N=Number of patients receiving the treatment. = 3092)	Tamoxifen 20 mg (N = 3094)
Body as a whole
Asthenia	575 (19)	544 (18)
Pain	533 (17)	485 (16)
Back pain	321 (10)	309 (10)
Headache	314 (10)	249 (8)
Abdominal pain	271 (9)	276 (9)
Infection	285 (9)	276 (9)
Accidental injury	311 (10)	303 (10)
Flu syndrome	175 (6)	195 (6)
Chest pain	200 (7)	150 (5)
Neoplasm	162 (5)	144 (5)
Cyst	138 (5)	162 (5)
Cardiovascular
Vasodilatation	1104 (36)	1264 (41)
Hypertension	402 (13)	349 (11)
Digestive
Nausea	343 (11)	335 (11)
Constipation	249 (8)	252 (8)
Diarrhea	265 (9)	216 (7)
Dyspepsia	206 (7)	169 (6)
Gastrointestinal disorder	210 (7)	158 (5)
Hemic and lymphatic
Lymphedema	304 (10)	341 (11)
Anemia	113 (4)	159 (5)
Metabolic and nutritional
Peripheral edema	311 (10)	343 (11)
Weight gain	285 (9)	274 (9)
Hypercholesterolemia	278 (9)	108 (3.5)
Musculoskeletal
Arthritis	512 (17)	445 (14)
Arthralgia	467 (15)	344 (11)
Osteoporosis	325 (11)	226 (7)
Fracture	315 (10)	209 (7)
Bone pain	201 (7)	185 (6)
Arthrosis	207 (7)	156 (5)
Joint Disorder	184 (6)	160 (5)
Myalgia	179 (6)	160 (5)
Nervous system
Depression	413 (13)	382 (12)
Insomnia	309 (10)	281 (9)
Dizziness	236 (8)	234 (8)
Anxiety	195 (6)	180 (6)
Paresthesia	215 (7)	145 (5)
Respiratory
Pharyngitis	443 (14)	422 (14)
Cough increased	261 (8)	287 (9)
Dyspnea	234 (8)	237 (8)
Sinusitis	184 (6)	159 (5)
Bronchitis	167 (5)	153 (5)
Skin and appendages
Rash	333 (11)	387 (13)
Sweating	145 (5)	177 (6)
Special Senses
Cataract Specified	182 (6)	213 (7)
Urogenital
Leukorrhea	86 (3)	286 (9)
Urinary tract infection	244 (8)	313 (10)
Breast pain	251 (8)	169 (6)
Breast Neoplasm	164 (5)	139 (5)
Vulvovaginitis	194 (6)	150 (5)
Vaginal HemorrhageVaginal Hemorrhage without further diagnosis.	122 (4)	180 (6)
Vaginitis	125 (4)	158 (5)

Certain adverse reactions and combinations of adverse reactions were prospectively specified for analysis, based on the known pharmacologic properties and side effect profiles of the two drugs (see Table 2).

Wrist/Colles’ fracturesSpine fracturesHip fractures

Table 2 - Number of Patients with Pre-specified Adverse Reactions in ATAC TrialPatients with multiple events in the same category are counted only once in that category.
	ARIMIDEX N=3092 (%)	Tamoxifen N=3094 (%)	Odds-ratio	95% CI
Hot Flashes	1104 (36)	1264 (41)	0.80	0.73 − 0.89
Musculoskeletal EventsRefers to joint symptoms, including joint disorder, arthritis, arthrosis and arthralgia.	1100 (36)	911 (29)	1.32	1.19 − 1.47
Fatigue/Asthenia	575 (19)	544 (18)	1.07	0.94 − 1.22
Mood Disturbances	597 (19)	554 (18)	1.10	0.97 − 1.25
Nausea and Vomiting	393 (13)	384 (12)	1.03	0.88 − 1.19
All Fractures	315 (10)	209 (7)	1.57	1.30 − 1.88
Fractures of Spine, Hip, or Wrist	133 (4)	91 (3)	1.48	1.13 − 1.95

67 (2)	50 (2)

43 (1)	22 (1)

28 (1)	26 (1)
Cataracts	182 (6)	213 (7)	0.85	0.69 − 1.04
Vaginal Bleeding	167 (5)	317 (10)	0.50	0.41 − 0.61
Ischemic Cardiovascular Disease	127 (4)	104 (3)	1.23	0.95 − 1.60
Vaginal Discharge	109 (4)	408 (13)	0.24	0.19 − 0.30
Venous Thromboembolic Events	87 (3)	140 (5)	0.61	0.47 − 0.80
Deep Venous Thromboembolic Events	48 (2)	74 (2)	0.64	0.45 − 0.93
Ischemic Cerebrovascular Event	62 (2)	88 (3)	0.70	0.50 − 0.97
Endometrial CancerPercentages calculated based upon the numbers of patients with an intact uterus at baseline.	4 (0.2)	13 (0.6)	0.31	0.10 − 0.94

Ischemic Cardiovascular Events

Between treatment arms in the overall population of 6186 patients, there was no statistical difference in ischemic cardiovascular events (4% ARIMIDEX vs. 3% tamoxifen). In the overall population, angina pectoris was reported in 71/3092 (2.3%) patients in the ARIMIDEX arm and 51/3094 (1.6%) patients in the tamoxifen arm; myocardial infarction was reported in 37/3092 (1.2%) patients in the ARIMIDEX arm and 34/3094 (1.1%) patients in the tamoxifen arm.

In women with pre-existing ischemic heart disease 465/6186 (7.5%), the incidence of ischemic cardiovascular events was 17% in patients on ARIMIDEX and 10% in patients on tamoxifen. In this patient population, angina pectoris was reported in 25/216 (11.6%) patients receiving ARIMIDEX and 13/249 (5.2%) patients receiving tamoxifen; myocardial infarction was reported in 2/216 (0.9%) patients receiving ARIMIDEX and 8/249 (3.2%) patients receiving tamoxifen.

Bone Mineral Density Findings

Results from the ATAC trial bone substudy at 12 and 24 months demonstrated that patients receiving ARIMIDEX 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.

Because ARIMIDEX lowers circulating estrogen levels it may cause a reduction in bone mineral density.

A post-marketing trial assessed the combined effects of ARIMIDEX and the bisphosphonate risedronate on changes from baseline in BMD and markers of bone resorption and formation in postmenopausal women with hormone receptor-positive early breast cancer. All patients received calcium and vitamin D supplementation. At 12 months, small reductions in lumbar spine bone mineral density were noted in patients not receiving bisphosphonates. Bisphosphonate treatment preserved bone density in most patients at risk of fracture.

Postmenopausal women with early breast cancer scheduled to be treated with ARIMIDEX should have their bone status managed according to treatment guidelines already available for postmenopausal women at similar risk of fragility fracture.

Cholesterol

During the ATAC trial, more patients receiving ARIMIDEX were reported to have an elevated serum cholesterol compared to patients receiving tamoxifen (9% versus 3.5%, respectively).

A post-marketing trial also evaluated any potential effects of ARIMIDEX on lipid profile. In the primary analysis population for lipids (ARIMIDEX alone), there was no clinically significant change in LDL-C from baseline to 12 months and HDL-C from baseline to 12 months.

In secondary population for lipids (ARIMIDEX+risedronate), there also was no clinically significant change in LDL-C and HDL-C from baseline to 12 months.

In both populations for lipids, there was no clinically significant difference in total cholesterol (TC) or serum triglycerides (TG) at 12 months compared with baseline.

In this trial, treatment for 12 months with ARIMIDEX alone had a neutral effect on lipid profile. Combination treatment with ARIMIDEX and risedronate also had a neutral effect on lipid profile.

The trial provides evidence that postmenopausal women with early breast cancer scheduled to be treated with ARIMIDEX should be managed using the current National Cholesterol Education Program guidelines for cardiovascular risk-based management of individual patients with LDL elevations.

Other Adverse Reactions

Patients receiving ARIMIDEX had an increase in joint disorders (including arthritis, arthrosis and arthralgia) compared with patients receiving tamoxifen. Patients receiving ARIMIDEX had an increase in the incidence of all fractures (specifically fractures of spine, hip and wrist) [315 (10%)] compared with patients receiving tamoxifen [209 (7%)].

Patients receiving ARIMIDEX had a higher incidence of carpal tunnel syndrome [78 (2.5%)] compared with patients receiving tamoxifen [22 (0.7%)].

Vaginal bleeding occurred more frequently in the tamoxifen-treated patients versus the ARIMIDEX-treated patients 317 (10%) versus 167 (5%), respectively.

Patients receiving ARIMIDEX had a lower incidence of hot flashes, vaginal bleeding, vaginal discharge, endometrial cancer, venous thromboembolic events and ischemic cerebrovascular events compared with patients receiving tamoxifen.

10-year median follow-up Safety Results from the ATAC Trial

Results are consistent with the previous analyses.

Serious adverse reactions were similar between ARIMIDEX (50%) and tamoxifen (51%).

•Cardiovascular events were consistent with the known safety profiles of ARIMIDEX and tamoxifen.
•The cumulative incidences of all first fractures (both serious and non-serious, occurring either during or after treatment) was higher in the ARIMIDEX group (15%) compared to the tamoxifen group (11%). This increased first fracture rate during treatment did not continue in the post-treatment follow-up period.
•The cumulative incidence of new primary cancers was similar in the ARIMIDEX group (13.7%) compared to the tamoxifen group (13.9%). Consistent with the previous analyses, endometrial cancer was higher in the tamoxifen group (0.8%) compared to the ARIMIDEX group (0.2%).
•The overall number of deaths (during or off-trial treatment) was similar between the treatment groups. There were more deaths related to breast cancer in the tamoxifen than in the ARIMIDEX treatment group.

First-Line Therapy

Adverse reactions occurring with an incidence of at least 5% in either treatment group of trials 0030 and 0027 during or within 2 weeks of the end of treatment are shown in Table 3.

Table 3 - Adverse Reactions Occurring with an Incidence of at Least 5% in Trials 0030 and 0027
Body system Adverse Reaction A patient may have had more than 1 adverse event.	Number (%) of subjects
	ARIMIDEX (N=506)	Tamoxifen (N=511)
Whole body
Asthenia	83 (16)	81 (16)
Pain	70 (14)	73 (14)
Back pain	60 (12)	68 (13)
Headache	47 (9)	40 (8)
Abdominal pain	40 (8)	38 (7)
Chest pain	37 (7)	37 (7)
Flu syndrome	35 (7)	30 (6)
Pelvic pain	23 (5)	30 (6)
Cardiovascular
Vasodilation	128 (25)	106 (21)
Hypertension	25 (5)	36 (7)
Digestive
Nausea	94 (19)	106 (21)
Constipation	47 (9)	66 (13)
Diarrhea	40 (8)	33 (6)
Vomiting	38 (8)	36 (7)
Anorexia	26 (5)	46 (9)
Metabolic and Nutritional
Peripheral edema	51 (10)	41 (8)
Musculoskeletal
Bone pain	54 (11)	52 (10)
Nervous
Dizziness	30 (6)	22 (4)
Insomnia	30 (6)	38 (7)
Depression	23 (5)	32 (6)
Hypertonia	16 (3)	26 (5)
Respiratory
Cough increased	55 (11)	52 (10)
Dyspnea	51 (10)	47 (9)
Pharyngitis	49 (10)	68 (13)
Skin and appendages
Rash	38 (8)	34 (8)
Urogenital
Leukorrhea	9 (2)	31 (6)

Less frequent adverse experiences reported in patients receiving ARIMIDEX 1 mg in either Trial 0030 or Trial 0027 were similar to those reported for second-line therapy.

Based on results from second-line therapy and the established safety profile of tamoxifen, the incidences of 9 pre-specified adverse event categories potentially causally related to one or both of the therapies because of their pharmacology were statistically analyzed. No significant differences were seen between treatment groups.

Table 4 - Number of Patients with Pre-specified Adverse Reactions in Trials 0030 and 0027
Adverse Reaction A patient may have had more than 1 adverse reaction.	Number (n) and Percentage of Patients
	ARIMIDEX 1 mg (N=506) n (%)	NOLVADEX 20 mg (N=511) n (%)
Depression	23 (5)	32 (6)
Tumor Flare	15 (3)	18 (4)
Thromboembolic DiseaseIncludes pulmonary embolus, thrombophlebitis, retinal vein thrombosis.	18 (4)	33 (6)
Venous	5	15
Coronary and CerebralIncludes myocardial infarction, myocardial ischemia, angina pectoris, cerebrovascular accident, cerebral ischemia and cerebral infarct.	13	19
Gastrointestinal Disturbance	170 (34)	196 (38)
Hot Flushes	134 (26)	118 (23)
Vaginal Dryness	9 (2)	3 (1)
Lethargy	6 (1)	15 (3)
Vaginal Bleeding	5 (1)	11 (2)
Weight Gain	11 (2)	8 (2)

Second-Line Therapy

ARIMIDEX was tolerated in two controlled clinical trials (i.e., Trials 0004 and 0005), with less than 3.3% of the ARIMIDEX-treated patients and 4.0% of the megestrol acetate-treated patients withdrawing due to an adverse reaction.

The principal adverse reaction more common with ARIMIDEX than megestrol acetate was diarrhea. Adverse reactions reported in greater than 5% of the patients in any of the treatment groups in these two controlled clinical trials, regardless of causality, are presented below:

Table 5 - Number (n) and Percentage of Patients with Adverse Reactions in Trials 0004 and 0005
Adverse Reaction A patient may have had more than one adverse reaction.	ARIMIDEX		ARIMIDEX		Megestrol Acetate
	1 mg		10 mg		160 mg
	(N=262)		(N=246)		(N=253)
	n	%	n	%	n	%
Asthenia	42	(16)	33	(13)	47	(19)
Nausea	41	(16)	48	(20)	28	(11)
Headache	34	(13)	44	(18)	24	(9)
Hot Flashes	32	(12)	29	(11)	21	(8)
Pain	28	(11)	38	(15)	29	(11)
Back Pain	28	(11)	26	(11)	19	(8)
Dyspnea	24	(9)	27	(11)	53	(21)
Vomiting	24	(9)	26	(11)	16	(6)
Cough Increased	22	(8)	18	(7)	19	(8)
Diarrhea	22	(8)	18	(7)	7	(3)
Constipation	18	(7)	18	(7)	21	(8)
Abdominal Pain	18	(7)	14	(6)	18	(7)
Anorexia	18	(7)	19	(8)	11	(4)
Bone Pain	17	(6)	26	(12)	19	(8)
Pharyngitis	16	(6)	23	(9)	15	(6)
Dizziness	16	(6)	12	(5)	15	(6)
Rash	15	(6)	15	(6)	19	(8)
Dry Mouth	15	(6)	11	(4)	13	(5)
Peripheral Edema	14	(5)	21	(9)	28	(11)
Pelvic Pain	14	(5)	17	(7)	13	(5)
Depression	14	(5)	6	(2)	5	(2)
Chest Pain	13	(5)	18	(7)	13	(5)
Paresthesia	12	(5)	15	(6)	9	(4)
Vaginal Hemorrhage	6	(2)	4	(2)	13	(5)
Weight Gain	4	(2)	9	(4)	30	(12)
Sweating	4	(2)	3	(1)	16	(6)
Increased Appetite	0	(0)	1	(0)	13	(5)

Other less frequent (2% to 5%) adverse reactions reported in patients receiving ARIMIDEX 1 mg in either Trial 0004 or Trial 0005 are listed below. These adverse experiences are listed by body system and are in order of decreasing frequency within each body system regardless of assessed causality.

Body as a Whole:

Flu syndrome; fever; neck pain; malaise; accidental injury; infection

Cardiovascular:

Hypertension; thrombophlebitis

Hepatic:

Gamma GT increased; SGOT increased; SGPT increased

Hematologic:

Anemia; leukopenia

Metabolic and Nutritional:

Alkaline phosphatase increased; weight loss

Mean serum total cholesterol levels increased by 0.5 mmol/L among patients receiving ARIMIDEX. Increases in LDL cholesterol have been shown to contribute to these changes.

Musculoskeletal:

Myalgia; arthralgia; pathological fracture

Nervous:

Somnolence; confusion; insomnia; anxiety; nervousness

Respiratory:

Sinusitis; bronchitis; rhinitis

Skin and Appendages:

Hair thinning (alopecia); pruritus

Urogenital:

Urinary tract infection; breast pain

The incidences of the following adverse reaction groups potentially causally related to one or both of the therapies because of their pharmacology, were statistically analyzed: weight gain, edema, thromboembolic disease, gastrointestinal disturbance, hot flushes, and vaginal dryness. These six groups, and the adverse reactions captured in the groups, were prospectively defined. The results are shown in the table below.

Table 6 - Number (n) and Percentage of Patients with Pre-specified Adverse Reactions in Trials 0004 and 0005
Adverse Reaction Group	ARIMIDEX		ARIMIDEX		Megestrol Acetate
	1 mg		10 mg		160 mg
	(N=262)		(N=246)		(N=253)
	n	(%)	n	(%)	n	(%)
Gastrointestinal Disturbance	77	(29)	81	(33)	54	(21)
Hot Flushes	33	(13)	29	(12)	35	(14)
Edema	19	(7)	28	(11)	35	(14)
Thromboembolic Disease	9	(3)	4	(2)	12	(5)
Vaginal Dryness	5	(2)	3	(1)	2	(1)
Weight Gain	4	(2)	10	(4)	30	(12)

)

•Decreases in bone mineral density may occur. Consider bone mineral density monitoring. (

5.2 Bone Effects

[see Adverse Reactions (6.1)]

6.1 Clinical Trials Experience

Adjuvant Therapy

Adverse reaction data for adjuvant therapy are based on the ATAC trial

[see Clinical Studies (14.1)]

. The median duration of adjuvant treatment for safety evaluation was 59.8 months and 59.6 months for patients receiving ARIMIDEX 1 mg and tamoxifen 20 mg, respectively.

Adverse reactions occurring with an incidence of at least 5% in either treatment group during treatment or within 14 days of the end of treatment are presented in Table 1.

Table 1 - Adverse reactions occurring with an incidence of at least 5% in either treatment group during treatment, or within 14 days of the end of treatment in the ATAC trialThe combination arm was discontinued due to lack of efficacy benefit at 33 months of follow-up.
Body system and adverse reactions by COSTART preferred term COSTART Coding Symbols for Thesaurus of Adverse Reaction Terms.A patient may have had more than 1 adverse reaction, including more than 1 adverse reaction in the same body system.	ARIMIDEX 1 mg (N N=Number of patients receiving the treatment. = 3092)	Tamoxifen 20 mg (N = 3094)
Body as a whole
Asthenia	575 (19)	544 (18)
Pain	533 (17)	485 (16)
Back pain	321 (10)	309 (10)
Headache	314 (10)	249 (8)
Abdominal pain	271 (9)	276 (9)
Infection	285 (9)	276 (9)
Accidental injury	311 (10)	303 (10)
Flu syndrome	175 (6)	195 (6)
Chest pain	200 (7)	150 (5)
Neoplasm	162 (5)	144 (5)
Cyst	138 (5)	162 (5)
Cardiovascular
Vasodilatation	1104 (36)	1264 (41)
Hypertension	402 (13)	349 (11)
Digestive
Nausea	343 (11)	335 (11)
Constipation	249 (8)	252 (8)
Diarrhea	265 (9)	216 (7)
Dyspepsia	206 (7)	169 (6)
Gastrointestinal disorder	210 (7)	158 (5)
Hemic and lymphatic
Lymphedema	304 (10)	341 (11)
Anemia	113 (4)	159 (5)
Metabolic and nutritional
Peripheral edema	311 (10)	343 (11)
Weight gain	285 (9)	274 (9)
Hypercholesterolemia	278 (9)	108 (3.5)
Musculoskeletal
Arthritis	512 (17)	445 (14)
Arthralgia	467 (15)	344 (11)
Osteoporosis	325 (11)	226 (7)
Fracture	315 (10)	209 (7)
Bone pain	201 (7)	185 (6)
Arthrosis	207 (7)	156 (5)
Joint Disorder	184 (6)	160 (5)
Myalgia	179 (6)	160 (5)
Nervous system
Depression	413 (13)	382 (12)
Insomnia	309 (10)	281 (9)
Dizziness	236 (8)	234 (8)
Anxiety	195 (6)	180 (6)
Paresthesia	215 (7)	145 (5)
Respiratory
Pharyngitis	443 (14)	422 (14)
Cough increased	261 (8)	287 (9)
Dyspnea	234 (8)	237 (8)
Sinusitis	184 (6)	159 (5)
Bronchitis	167 (5)	153 (5)
Skin and appendages
Rash	333 (11)	387 (13)
Sweating	145 (5)	177 (6)
Special Senses
Cataract Specified	182 (6)	213 (7)
Urogenital
Leukorrhea	86 (3)	286 (9)
Urinary tract infection	244 (8)	313 (10)
Breast pain	251 (8)	169 (6)
Breast Neoplasm	164 (5)	139 (5)
Vulvovaginitis	194 (6)	150 (5)
Vaginal HemorrhageVaginal Hemorrhage without further diagnosis.	122 (4)	180 (6)
Vaginitis	125 (4)	158 (5)

Wrist/Colles’ fracturesSpine fracturesHip fractures

Table 2 - Number of Patients with Pre-specified Adverse Reactions in ATAC TrialPatients with multiple events in the same category are counted only once in that category.
	ARIMIDEX N=3092 (%)	Tamoxifen N=3094 (%)	Odds-ratio	95% CI
Hot Flashes	1104 (36)	1264 (41)	0.80	0.73 − 0.89
Musculoskeletal EventsRefers to joint symptoms, including joint disorder, arthritis, arthrosis and arthralgia.	1100 (36)	911 (29)	1.32	1.19 − 1.47
Fatigue/Asthenia	575 (19)	544 (18)	1.07	0.94 − 1.22
Mood Disturbances	597 (19)	554 (18)	1.10	0.97 − 1.25
Nausea and Vomiting	393 (13)	384 (12)	1.03	0.88 − 1.19
All Fractures	315 (10)	209 (7)	1.57	1.30 − 1.88
Fractures of Spine, Hip, or Wrist	133 (4)	91 (3)	1.48	1.13 − 1.95

67 (2)	50 (2)

43 (1)	22 (1)

28 (1)	26 (1)
Cataracts	182 (6)	213 (7)	0.85	0.69 − 1.04
Vaginal Bleeding	167 (5)	317 (10)	0.50	0.41 − 0.61
Ischemic Cardiovascular Disease	127 (4)	104 (3)	1.23	0.95 − 1.60
Vaginal Discharge	109 (4)	408 (13)	0.24	0.19 − 0.30
Venous Thromboembolic Events	87 (3)	140 (5)	0.61	0.47 − 0.80
Deep Venous Thromboembolic Events	48 (2)	74 (2)	0.64	0.45 − 0.93
Ischemic Cerebrovascular Event	62 (2)	88 (3)	0.70	0.50 − 0.97
Endometrial CancerPercentages calculated based upon the numbers of patients with an intact uterus at baseline.	4 (0.2)	13 (0.6)	0.31	0.10 − 0.94

Ischemic Cardiovascular Events

Bone Mineral Density Findings

Because ARIMIDEX lowers circulating estrogen levels it may cause a reduction in bone mineral density.

Cholesterol

During the ATAC trial, more patients receiving ARIMIDEX were reported to have an elevated serum cholesterol compared to patients receiving tamoxifen (9% versus 3.5%, respectively).

In secondary population for lipids (ARIMIDEX+risedronate), there also was no clinically significant change in LDL-C and HDL-C from baseline to 12 months.

In both populations for lipids, there was no clinically significant difference in total cholesterol (TC) or serum triglycerides (TG) at 12 months compared with baseline.

In this trial, treatment for 12 months with ARIMIDEX alone had a neutral effect on lipid profile. Combination treatment with ARIMIDEX and risedronate also had a neutral effect on lipid profile.

Other Adverse Reactions

Patients receiving ARIMIDEX had a higher incidence of carpal tunnel syndrome [78 (2.5%)] compared with patients receiving tamoxifen [22 (0.7%)].

Vaginal bleeding occurred more frequently in the tamoxifen-treated patients versus the ARIMIDEX-treated patients 317 (10%) versus 167 (5%), respectively.

10-year median follow-up Safety Results from the ATAC Trial

Results are consistent with the previous analyses.

Serious adverse reactions were similar between ARIMIDEX (50%) and tamoxifen (51%).

•Cardiovascular events were consistent with the known safety profiles of ARIMIDEX and tamoxifen.
•The cumulative incidences of all first fractures (both serious and non-serious, occurring either during or after treatment) was higher in the ARIMIDEX group (15%) compared to the tamoxifen group (11%). This increased first fracture rate during treatment did not continue in the post-treatment follow-up period.
•The cumulative incidence of new primary cancers was similar in the ARIMIDEX group (13.7%) compared to the tamoxifen group (13.9%). Consistent with the previous analyses, endometrial cancer was higher in the tamoxifen group (0.8%) compared to the ARIMIDEX group (0.2%).
•The overall number of deaths (during or off-trial treatment) was similar between the treatment groups. There were more deaths related to breast cancer in the tamoxifen than in the ARIMIDEX treatment group.

First-Line Therapy

Adverse reactions occurring with an incidence of at least 5% in either treatment group of trials 0030 and 0027 during or within 2 weeks of the end of treatment are shown in Table 3.

Table 3 - Adverse Reactions Occurring with an Incidence of at Least 5% in Trials 0030 and 0027
Body system Adverse Reaction A patient may have had more than 1 adverse event.	Number (%) of subjects
	ARIMIDEX (N=506)	Tamoxifen (N=511)
Whole body
Asthenia	83 (16)	81 (16)
Pain	70 (14)	73 (14)
Back pain	60 (12)	68 (13)
Headache	47 (9)	40 (8)
Abdominal pain	40 (8)	38 (7)
Chest pain	37 (7)	37 (7)
Flu syndrome	35 (7)	30 (6)
Pelvic pain	23 (5)	30 (6)
Cardiovascular
Vasodilation	128 (25)	106 (21)
Hypertension	25 (5)	36 (7)
Digestive
Nausea	94 (19)	106 (21)
Constipation	47 (9)	66 (13)
Diarrhea	40 (8)	33 (6)
Vomiting	38 (8)	36 (7)
Anorexia	26 (5)	46 (9)
Metabolic and Nutritional
Peripheral edema	51 (10)	41 (8)
Musculoskeletal
Bone pain	54 (11)	52 (10)
Nervous
Dizziness	30 (6)	22 (4)
Insomnia	30 (6)	38 (7)
Depression	23 (5)	32 (6)
Hypertonia	16 (3)	26 (5)
Respiratory
Cough increased	55 (11)	52 (10)
Dyspnea	51 (10)	47 (9)
Pharyngitis	49 (10)	68 (13)
Skin and appendages
Rash	38 (8)	34 (8)
Urogenital
Leukorrhea	9 (2)	31 (6)

Less frequent adverse experiences reported in patients receiving ARIMIDEX 1 mg in either Trial 0030 or Trial 0027 were similar to those reported for second-line therapy.

Table 4 - Number of Patients with Pre-specified Adverse Reactions in Trials 0030 and 0027
Adverse Reaction A patient may have had more than 1 adverse reaction.	Number (n) and Percentage of Patients
	ARIMIDEX 1 mg (N=506) n (%)	NOLVADEX 20 mg (N=511) n (%)
Depression	23 (5)	32 (6)
Tumor Flare	15 (3)	18 (4)
Thromboembolic DiseaseIncludes pulmonary embolus, thrombophlebitis, retinal vein thrombosis.	18 (4)	33 (6)
Venous	5	15
Coronary and CerebralIncludes myocardial infarction, myocardial ischemia, angina pectoris, cerebrovascular accident, cerebral ischemia and cerebral infarct.	13	19
Gastrointestinal Disturbance	170 (34)	196 (38)
Hot Flushes	134 (26)	118 (23)
Vaginal Dryness	9 (2)	3 (1)
Lethargy	6 (1)	15 (3)
Vaginal Bleeding	5 (1)	11 (2)
Weight Gain	11 (2)	8 (2)

Second-Line Therapy

Table 5 - Number (n) and Percentage of Patients with Adverse Reactions in Trials 0004 and 0005
Adverse Reaction A patient may have had more than one adverse reaction.	ARIMIDEX		ARIMIDEX		Megestrol Acetate
	1 mg		10 mg		160 mg
	(N=262)		(N=246)		(N=253)
	n	%	n	%	n	%
Asthenia	42	(16)	33	(13)	47	(19)
Nausea	41	(16)	48	(20)	28	(11)
Headache	34	(13)	44	(18)	24	(9)
Hot Flashes	32	(12)	29	(11)	21	(8)
Pain	28	(11)	38	(15)	29	(11)
Back Pain	28	(11)	26	(11)	19	(8)
Dyspnea	24	(9)	27	(11)	53	(21)
Vomiting	24	(9)	26	(11)	16	(6)
Cough Increased	22	(8)	18	(7)	19	(8)
Diarrhea	22	(8)	18	(7)	7	(3)
Constipation	18	(7)	18	(7)	21	(8)
Abdominal Pain	18	(7)	14	(6)	18	(7)
Anorexia	18	(7)	19	(8)	11	(4)
Bone Pain	17	(6)	26	(12)	19	(8)
Pharyngitis	16	(6)	23	(9)	15	(6)
Dizziness	16	(6)	12	(5)	15	(6)
Rash	15	(6)	15	(6)	19	(8)
Dry Mouth	15	(6)	11	(4)	13	(5)
Peripheral Edema	14	(5)	21	(9)	28	(11)
Pelvic Pain	14	(5)	17	(7)	13	(5)
Depression	14	(5)	6	(2)	5	(2)
Chest Pain	13	(5)	18	(7)	13	(5)
Paresthesia	12	(5)	15	(6)	9	(4)
Vaginal Hemorrhage	6	(2)	4	(2)	13	(5)
Weight Gain	4	(2)	9	(4)	30	(12)
Sweating	4	(2)	3	(1)	16	(6)
Increased Appetite	0	(0)	1	(0)	13	(5)

Body as a Whole:

Flu syndrome; fever; neck pain; malaise; accidental injury; infection

Cardiovascular:

Hypertension; thrombophlebitis

Hepatic:

Gamma GT increased; SGOT increased; SGPT increased

Hematologic:

Anemia; leukopenia

Metabolic and Nutritional:

Alkaline phosphatase increased; weight loss

Mean serum total cholesterol levels increased by 0.5 mmol/L among patients receiving ARIMIDEX. Increases in LDL cholesterol have been shown to contribute to these changes.

Musculoskeletal:

Myalgia; arthralgia; pathological fracture

Nervous:

Somnolence; confusion; insomnia; anxiety; nervousness

Respiratory:

Sinusitis; bronchitis; rhinitis

Skin and Appendages:

Hair thinning (alopecia); pruritus

Urogenital:

Urinary tract infection; breast pain

Table 6 - Number (n) and Percentage of Patients with Pre-specified Adverse Reactions in Trials 0004 and 0005
Adverse Reaction Group	ARIMIDEX		ARIMIDEX		Megestrol Acetate
	1 mg		10 mg		160 mg
	(N=262)		(N=246)		(N=253)
	n	(%)	n	(%)	n	(%)
Gastrointestinal Disturbance	77	(29)	81	(33)	54	(21)
Hot Flushes	33	(13)	29	(12)	35	(14)
Edema	19	(7)	28	(11)	35	(14)
Thromboembolic Disease	9	(3)	4	(2)	12	(5)
Vaginal Dryness	5	(2)	3	(1)	2	(1)
Weight Gain	4	(2)	10	(4)	30	(12)

)

•Increases in total cholesterol may occur. Consider cholesterol monitoring. (

5.3 Cholesterol

During the ATAC trial, more patients receiving ARIMIDEX were reported to have elevated serum cholesterol compared to patients receiving tamoxifen (9% versus 3.5%, respectively)

[see Adverse Reactions (6.1)]

6.1 Clinical Trials Experience

Adjuvant Therapy

Adverse reaction data for adjuvant therapy are based on the ATAC trial

[see Clinical Studies (14.1)]

. The median duration of adjuvant treatment for safety evaluation was 59.8 months and 59.6 months for patients receiving ARIMIDEX 1 mg and tamoxifen 20 mg, respectively.

Adverse reactions occurring with an incidence of at least 5% in either treatment group during treatment or within 14 days of the end of treatment are presented in Table 1.

Table 1 - Adverse reactions occurring with an incidence of at least 5% in either treatment group during treatment, or within 14 days of the end of treatment in the ATAC trialThe combination arm was discontinued due to lack of efficacy benefit at 33 months of follow-up.
Body system and adverse reactions by COSTART preferred term COSTART Coding Symbols for Thesaurus of Adverse Reaction Terms.A patient may have had more than 1 adverse reaction, including more than 1 adverse reaction in the same body system.	ARIMIDEX 1 mg (N N=Number of patients receiving the treatment. = 3092)	Tamoxifen 20 mg (N = 3094)
Body as a whole
Asthenia	575 (19)	544 (18)
Pain	533 (17)	485 (16)
Back pain	321 (10)	309 (10)
Headache	314 (10)	249 (8)
Abdominal pain	271 (9)	276 (9)
Infection	285 (9)	276 (9)
Accidental injury	311 (10)	303 (10)
Flu syndrome	175 (6)	195 (6)
Chest pain	200 (7)	150 (5)
Neoplasm	162 (5)	144 (5)
Cyst	138 (5)	162 (5)
Cardiovascular
Vasodilatation	1104 (36)	1264 (41)
Hypertension	402 (13)	349 (11)
Digestive
Nausea	343 (11)	335 (11)
Constipation	249 (8)	252 (8)
Diarrhea	265 (9)	216 (7)
Dyspepsia	206 (7)	169 (6)
Gastrointestinal disorder	210 (7)	158 (5)
Hemic and lymphatic
Lymphedema	304 (10)	341 (11)
Anemia	113 (4)	159 (5)
Metabolic and nutritional
Peripheral edema	311 (10)	343 (11)
Weight gain	285 (9)	274 (9)
Hypercholesterolemia	278 (9)	108 (3.5)
Musculoskeletal
Arthritis	512 (17)	445 (14)
Arthralgia	467 (15)	344 (11)
Osteoporosis	325 (11)	226 (7)
Fracture	315 (10)	209 (7)
Bone pain	201 (7)	185 (6)
Arthrosis	207 (7)	156 (5)
Joint Disorder	184 (6)	160 (5)
Myalgia	179 (6)	160 (5)
Nervous system
Depression	413 (13)	382 (12)
Insomnia	309 (10)	281 (9)
Dizziness	236 (8)	234 (8)
Anxiety	195 (6)	180 (6)
Paresthesia	215 (7)	145 (5)
Respiratory
Pharyngitis	443 (14)	422 (14)
Cough increased	261 (8)	287 (9)
Dyspnea	234 (8)	237 (8)
Sinusitis	184 (6)	159 (5)
Bronchitis	167 (5)	153 (5)
Skin and appendages
Rash	333 (11)	387 (13)
Sweating	145 (5)	177 (6)
Special Senses
Cataract Specified	182 (6)	213 (7)
Urogenital
Leukorrhea	86 (3)	286 (9)
Urinary tract infection	244 (8)	313 (10)
Breast pain	251 (8)	169 (6)
Breast Neoplasm	164 (5)	139 (5)
Vulvovaginitis	194 (6)	150 (5)
Vaginal HemorrhageVaginal Hemorrhage without further diagnosis.	122 (4)	180 (6)
Vaginitis	125 (4)	158 (5)

Wrist/Colles’ fracturesSpine fracturesHip fractures

Table 2 - Number of Patients with Pre-specified Adverse Reactions in ATAC TrialPatients with multiple events in the same category are counted only once in that category.
	ARIMIDEX N=3092 (%)	Tamoxifen N=3094 (%)	Odds-ratio	95% CI
Hot Flashes	1104 (36)	1264 (41)	0.80	0.73 − 0.89
Musculoskeletal EventsRefers to joint symptoms, including joint disorder, arthritis, arthrosis and arthralgia.	1100 (36)	911 (29)	1.32	1.19 − 1.47
Fatigue/Asthenia	575 (19)	544 (18)	1.07	0.94 − 1.22
Mood Disturbances	597 (19)	554 (18)	1.10	0.97 − 1.25
Nausea and Vomiting	393 (13)	384 (12)	1.03	0.88 − 1.19
All Fractures	315 (10)	209 (7)	1.57	1.30 − 1.88
Fractures of Spine, Hip, or Wrist	133 (4)	91 (3)	1.48	1.13 − 1.95

67 (2)	50 (2)

43 (1)	22 (1)

28 (1)	26 (1)
Cataracts	182 (6)	213 (7)	0.85	0.69 − 1.04
Vaginal Bleeding	167 (5)	317 (10)	0.50	0.41 − 0.61
Ischemic Cardiovascular Disease	127 (4)	104 (3)	1.23	0.95 − 1.60
Vaginal Discharge	109 (4)	408 (13)	0.24	0.19 − 0.30
Venous Thromboembolic Events	87 (3)	140 (5)	0.61	0.47 − 0.80
Deep Venous Thromboembolic Events	48 (2)	74 (2)	0.64	0.45 − 0.93
Ischemic Cerebrovascular Event	62 (2)	88 (3)	0.70	0.50 − 0.97
Endometrial CancerPercentages calculated based upon the numbers of patients with an intact uterus at baseline.	4 (0.2)	13 (0.6)	0.31	0.10 − 0.94

Ischemic Cardiovascular Events

Bone Mineral Density Findings

Because ARIMIDEX lowers circulating estrogen levels it may cause a reduction in bone mineral density.

Cholesterol

During the ATAC trial, more patients receiving ARIMIDEX were reported to have an elevated serum cholesterol compared to patients receiving tamoxifen (9% versus 3.5%, respectively).

In secondary population for lipids (ARIMIDEX+risedronate), there also was no clinically significant change in LDL-C and HDL-C from baseline to 12 months.

In both populations for lipids, there was no clinically significant difference in total cholesterol (TC) or serum triglycerides (TG) at 12 months compared with baseline.

In this trial, treatment for 12 months with ARIMIDEX alone had a neutral effect on lipid profile. Combination treatment with ARIMIDEX and risedronate also had a neutral effect on lipid profile.

Other Adverse Reactions

Patients receiving ARIMIDEX had a higher incidence of carpal tunnel syndrome [78 (2.5%)] compared with patients receiving tamoxifen [22 (0.7%)].

Vaginal bleeding occurred more frequently in the tamoxifen-treated patients versus the ARIMIDEX-treated patients 317 (10%) versus 167 (5%), respectively.

10-year median follow-up Safety Results from the ATAC Trial

Results are consistent with the previous analyses.

Serious adverse reactions were similar between ARIMIDEX (50%) and tamoxifen (51%).

•Cardiovascular events were consistent with the known safety profiles of ARIMIDEX and tamoxifen.
•The cumulative incidences of all first fractures (both serious and non-serious, occurring either during or after treatment) was higher in the ARIMIDEX group (15%) compared to the tamoxifen group (11%). This increased first fracture rate during treatment did not continue in the post-treatment follow-up period.
•The cumulative incidence of new primary cancers was similar in the ARIMIDEX group (13.7%) compared to the tamoxifen group (13.9%). Consistent with the previous analyses, endometrial cancer was higher in the tamoxifen group (0.8%) compared to the ARIMIDEX group (0.2%).
•The overall number of deaths (during or off-trial treatment) was similar between the treatment groups. There were more deaths related to breast cancer in the tamoxifen than in the ARIMIDEX treatment group.

First-Line Therapy

Adverse reactions occurring with an incidence of at least 5% in either treatment group of trials 0030 and 0027 during or within 2 weeks of the end of treatment are shown in Table 3.

Table 3 - Adverse Reactions Occurring with an Incidence of at Least 5% in Trials 0030 and 0027
Body system Adverse Reaction A patient may have had more than 1 adverse event.	Number (%) of subjects
	ARIMIDEX (N=506)	Tamoxifen (N=511)
Whole body
Asthenia	83 (16)	81 (16)
Pain	70 (14)	73 (14)
Back pain	60 (12)	68 (13)
Headache	47 (9)	40 (8)
Abdominal pain	40 (8)	38 (7)
Chest pain	37 (7)	37 (7)
Flu syndrome	35 (7)	30 (6)
Pelvic pain	23 (5)	30 (6)
Cardiovascular
Vasodilation	128 (25)	106 (21)
Hypertension	25 (5)	36 (7)
Digestive
Nausea	94 (19)	106 (21)
Constipation	47 (9)	66 (13)
Diarrhea	40 (8)	33 (6)
Vomiting	38 (8)	36 (7)
Anorexia	26 (5)	46 (9)
Metabolic and Nutritional
Peripheral edema	51 (10)	41 (8)
Musculoskeletal
Bone pain	54 (11)	52 (10)
Nervous
Dizziness	30 (6)	22 (4)
Insomnia	30 (6)	38 (7)
Depression	23 (5)	32 (6)
Hypertonia	16 (3)	26 (5)
Respiratory
Cough increased	55 (11)	52 (10)
Dyspnea	51 (10)	47 (9)
Pharyngitis	49 (10)	68 (13)
Skin and appendages
Rash	38 (8)	34 (8)
Urogenital
Leukorrhea	9 (2)	31 (6)

Less frequent adverse experiences reported in patients receiving ARIMIDEX 1 mg in either Trial 0030 or Trial 0027 were similar to those reported for second-line therapy.

Table 4 - Number of Patients with Pre-specified Adverse Reactions in Trials 0030 and 0027
Adverse Reaction A patient may have had more than 1 adverse reaction.	Number (n) and Percentage of Patients
	ARIMIDEX 1 mg (N=506) n (%)	NOLVADEX 20 mg (N=511) n (%)
Depression	23 (5)	32 (6)
Tumor Flare	15 (3)	18 (4)
Thromboembolic DiseaseIncludes pulmonary embolus, thrombophlebitis, retinal vein thrombosis.	18 (4)	33 (6)
Venous	5	15
Coronary and CerebralIncludes myocardial infarction, myocardial ischemia, angina pectoris, cerebrovascular accident, cerebral ischemia and cerebral infarct.	13	19
Gastrointestinal Disturbance	170 (34)	196 (38)
Hot Flushes	134 (26)	118 (23)
Vaginal Dryness	9 (2)	3 (1)
Lethargy	6 (1)	15 (3)
Vaginal Bleeding	5 (1)	11 (2)
Weight Gain	11 (2)	8 (2)

Second-Line Therapy

Table 5 - Number (n) and Percentage of Patients with Adverse Reactions in Trials 0004 and 0005
Adverse Reaction A patient may have had more than one adverse reaction.	ARIMIDEX		ARIMIDEX		Megestrol Acetate
	1 mg		10 mg		160 mg
	(N=262)		(N=246)		(N=253)
	n	%	n	%	n	%
Asthenia	42	(16)	33	(13)	47	(19)
Nausea	41	(16)	48	(20)	28	(11)
Headache	34	(13)	44	(18)	24	(9)
Hot Flashes	32	(12)	29	(11)	21	(8)
Pain	28	(11)	38	(15)	29	(11)
Back Pain	28	(11)	26	(11)	19	(8)
Dyspnea	24	(9)	27	(11)	53	(21)
Vomiting	24	(9)	26	(11)	16	(6)
Cough Increased	22	(8)	18	(7)	19	(8)
Diarrhea	22	(8)	18	(7)	7	(3)
Constipation	18	(7)	18	(7)	21	(8)
Abdominal Pain	18	(7)	14	(6)	18	(7)
Anorexia	18	(7)	19	(8)	11	(4)
Bone Pain	17	(6)	26	(12)	19	(8)
Pharyngitis	16	(6)	23	(9)	15	(6)
Dizziness	16	(6)	12	(5)	15	(6)
Rash	15	(6)	15	(6)	19	(8)
Dry Mouth	15	(6)	11	(4)	13	(5)
Peripheral Edema	14	(5)	21	(9)	28	(11)
Pelvic Pain	14	(5)	17	(7)	13	(5)
Depression	14	(5)	6	(2)	5	(2)
Chest Pain	13	(5)	18	(7)	13	(5)
Paresthesia	12	(5)	15	(6)	9	(4)
Vaginal Hemorrhage	6	(2)	4	(2)	13	(5)
Weight Gain	4	(2)	9	(4)	30	(12)
Sweating	4	(2)	3	(1)	16	(6)
Increased Appetite	0	(0)	1	(0)	13	(5)

Body as a Whole:

Flu syndrome; fever; neck pain; malaise; accidental injury; infection

Cardiovascular:

Hypertension; thrombophlebitis

Hepatic:

Gamma GT increased; SGOT increased; SGPT increased

Hematologic:

Anemia; leukopenia

Metabolic and Nutritional:

Alkaline phosphatase increased; weight loss

Mean serum total cholesterol levels increased by 0.5 mmol/L among patients receiving ARIMIDEX. Increases in LDL cholesterol have been shown to contribute to these changes.

Musculoskeletal:

Myalgia; arthralgia; pathological fracture

Nervous:

Somnolence; confusion; insomnia; anxiety; nervousness

Respiratory:

Sinusitis; bronchitis; rhinitis

Skin and Appendages:

Hair thinning (alopecia); pruritus

Urogenital:

Urinary tract infection; breast pain

Table 6 - Number (n) and Percentage of Patients with Pre-specified Adverse Reactions in Trials 0004 and 0005
Adverse Reaction Group	ARIMIDEX		ARIMIDEX		Megestrol Acetate
	1 mg		10 mg		160 mg
	(N=262)		(N=246)		(N=253)
	n	(%)	n	(%)	n	(%)
Gastrointestinal Disturbance	77	(29)	81	(33)	54	(21)
Hot Flushes	33	(13)	29	(12)	35	(14)
Edema	19	(7)	28	(11)	35	(14)
Thromboembolic Disease	9	(3)	4	(2)	12	(5)
Vaginal Dryness	5	(2)	3	(1)	2	(1)
Weight Gain	4	(2)	10	(4)	30	(12)

)

•Embryo-Fetal Toxicity: ARIMIDEX may cause fetal harm. Advise patients of the potential risk to a fetus and to use effective contraception. (
5.4 Embryo-Fetal Toxicity
Based on findings from animal studies and its mechanism of action, ARIMIDEX can cause fetal harm when administered to a pregnant woman. 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/m²basis. Advise pregnant women and females of reproductive potential of the potential risk to a fetus. Advise females of reproductive potential to use effective contraception during therapy with ARIMIDEX and for at least 3 weeks after the last dose
[see Use in Specific Populations (8.1,8.3) and Clinical Pharmacology (12.1)]
.
,
8.1 Pregnancy
Risk Summary
Based on findings from animal studies and its mechanism of action, ARIMIDEX may cause fetal harm when administered to a pregnant woman
[see Clinical Pharmacology (12.1)]
. There are no studies of ARIMIDEX 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/m²basis. Advise pregnant women and females of reproductive potential of the potential risk to a fetus.
The background risk of major birth defects and miscarriage for the indicated population is unknown. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.
Data
Animal Data
In animal reproduction studies, pregnant rats and rabbits received anastrozole during organogenesis at doses equal to or greater than 0.1 and 0.02 mg/kg/day, respectively, (about 1 and 1/3 the recommended human dose on a mg/m²basis, respectively). In both species, anastrozole crossed the placenta, and there was increased pregnancy loss (increased pre- and/or post-implantation loss, increased resorption, and decreased numbers of live fetuses). In rats, these effects were dose related, and placental weights were significantly increased at doses equal to or greater than 0.1 mg/kg/day. Fetotoxicity, including delayed fetal development (i.e., incomplete ossification and depressed fetal body weights), occurred in rats at anastrozole doses of 1 mg/kg/day that produced peak plasma levels 19 times higher than serum levels in humans at the therapeutic dose (AUC_0-24hr9 times higher). In rabbits, anastrozole caused pregnancy failure at doses equal to or greater than 1.0 mg/kg/day (about 16 times the recommended human dose on a mg/m²basis).
)

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