Bosulif

DEescription

Bosutinib is a kinase inhibitor. The chemical name for bosutinib monohydrate is 3-Quinolinecarbonitrile, 4-[(2,4- dichloro-5-methoxyphenyl)amino]-6-methoxy-7-[3-(4-methyl-1-piperazinyl) propoxy]-, hydrate (1:1). Its chemical formula is C₂₆H₂₉Cl₂N₅O₃•H₂O (monohydrate); its molecular weight is 548.46 (monohydrate), equivalent to 530.46 (anhydrous). Bosutinib monohydrate has the following chemical structure:

 

Bosutinib monohydrate is a white to yellowish-tan powder. Bosutinib monohydrate has a pH dependent solubility across the physiological pH range. At or below pH 5, bosutinib monohydrate behaves as a highly soluble compound. Above pH 5, the solubility of bosutinib monohydrate reduces rapidly.

BOSULIF® (bosutinib) tablets are supplied for oral administration in 3 strengths: a 100 mg yellow, oval, biconvex, film-coated tablet debossed with “Pfizer” on one side and “100” on the other; a 400 mg orange, oval, biconvex, filmcoated tablet debossed with “Pfizer” on one side and “400” on the other; and a 500 mg red, oval, biconvex, film-coated tablet debossed with “Pfizer” on one side and “500” on the other.

Each 100 mg BOSULIF tablet contains 103.40 mg of bosutinib monohydrate, equivalent to 100 mg of bosutinib; each 400 mg BOSULIF tablet contains 413.60 mg of bosutinib monohydrate, equivalent to 400 mg of bosutinib; each 500 mg BOSULIF tablet contains 516.98 mg of bosutinib monohydrate, equivalent to 500 mg of bosutinib.

The following inactive ingredients are included in the tablets: microcrystalline cellulose, croscarmellose sodium, poloxamer, povidone, magnesium stearate, polyvinyl alcohol, titanium dioxide, polyethylene glycol, talc, and iron oxide yellow (for 100 mg, and 400 mg tablet) and iron oxide red (for 400 mg, and 500 mg tablet).

BOSULIF is indicated for the treatment of adult patients with:

• Newly-diagnosed chronic phase (CP) Philadelphia chromosome-positive chronic myelogenous leukemia (Ph+ CML).
• Chronic phase, accelerated phase (AP), or blast phase (BP) Ph+ CML with resistance or intolerance to prior therapy.

Dosage and Administration

Recommended Dosing

The recommended dose is taken orally once daily with food. The tablet is to be swallowed whole and should not be broken or cut. Continue treatment with BOSULIF until disease progression or intolerance to therapy.

If a dose is missed beyond 12 hours, the patient should skip the dose and take the usual prescribed dose on the following day.

Newly-Diagnosed CP Ph+ CML

The recommended dose of BOSULIF is 400 mg orally once daily with food.

CP, AP, Or BP Ph+ CML With Resistance Or Intolerance To Prior Therapy

The recommended dose and schedule of BOSULIF is 500 mg orally once daily with food.

Dose Escalation

In clinical studies of adult Ph+ CML patients, dose escalation by increments of 100 mg once daily to a maximum of 600 mg once daily was allowed in patients who did not achieve or maintain a hematologic, cytogenetic, or molecular response and who did not have Grade 3 or higher adverse reactions at the recommended starting dosage.

Dose Adjustments For Non-Hematologic Adverse Reactions

Elevated liver transaminases: If elevations in liver transaminases greater than 5×institutional upper limit of normal (ULN) occur, withhold BOSULIF until recovery to less than or equal to 2.5×ULN and resume at 400 mg once daily thereafter. If recovery takes longer than 4 weeks, discontinue BOSULIF. If transaminase elevations greater than or equal to 3×ULN occur concurrently with bilirubin elevations greater than 2×ULN and alkaline phosphatase less than 2×ULN (Hy’s law case definition), discontinue BOSULIF [see WARNINGS AND PRECAUTIONS].

Diarrhea

For National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) Grade 3-4 diarrhea (increase of greater than or equal to 7 stools/day over baseline/pretreatment), withhold BOSULIF until recovery to Grade less than or equal to 1. BOSULIF may be resumed at 400 mg once daily [see WARNINGS AND PRECAUTIONS].

For other clinically significant, moderate or severe non-hematological toxicity, withhold BOSULIF until the toxicity has resolved, then consider resuming BOSULIF at a dose reduced by 100 mg taken once daily. If clinically appropriate, consider re-escalating the dose of BOSULIF to the starting dose taken once daily. Doses less than 300 mg/day have been used in patients; however, efficacy has not been established.

Dose Adjustments For Myelosuppression

Dose reductions for severe or persistent neutropenia and thrombocytopenia are described below (Table 1).

Table 1: Dose Adjustments for Neutropenia and Thrombocytopenia

ANCa less than 1000 x 106/L or Platelets less than 50,000* 106/L

Withhold BOSULIF until ANC greater than or equal to1000*106/L and platelets greater than or equal to 50,000*106/L. Resume treatment with BOSULIF at the same dose if recovery occurs within 2 weeks. If blood counts remain low for greater than 2 weeks, upon recovery, reduce dose by 100 mg and resume treatment. If cytopenia recurs, reduce dose by an additional 100 mg upon recovery and resume treatment. Doses less than 300 mg/day have been used in patients; however, efficacy has not been established.

a Absolute Neutrophil Count

Dose Adjustments For Renal Impairment Or Hepatic Impairment

The recommended starting doses for patients with renal and hepatic impairment are described in Table 2 below.

Table 2: Dose Adjustments for Renal and Hepatic Impairment

	Recommended Starting Dosage
	Newly-diagnosed chronic phase Ph+ CML2	Chronic, accelerated, or blast phase Ph+ CML with resistance or intolerance to prior therapy
Normal renal and hepatic function	400 mg daily	500 mg daily
Renal impairment
Creatinine clearance 30 to 50 mL/min	300 mg daily	400 mg daily
Creatinine clearance less than 30 mL/min	200 mg daily	300 mg daily
Hepatic impairment
Mild (Child-Pugh A), Moderate (Child-Pugh B) or Severe (Child-Pugh C)	200 mg dailya	200 mg dailya
[see Use In Specific Populations and CLINICAL PHARMACOLOGY]. Abbreviations: CML=chronic myelogenous leukemia; Ph+=Philadelphia chromosome-positive. a There are no clinical data for efficacy at the dose of 200 mg once daily in patients with CML.

How Supplied

Dosage Forms And Strengths

• 100 mg tablets: yellow, oval, biconvex, film-coated tablets debossed with “Pfizer” on one side and “100” on the other.
• 400 mg tablets: orange, oval, biconvex, film-coated tablets debossed with “Pfizer” on one side and “400” on the other.
• 500 mg tablets: red, oval, biconvex, film-coated tablets debossed with “Pfizer” on one side and “500” on the other.

Storage And Handling

BOSULIF (bosutinib) tablets are supplied for oral administration in 3 strengths: a 100 mg yellow, oval, biconvex, film-coated tablet debossed with “Pfizer” on one side and “100” on the other; a 400 mg orange, oval, biconvex, film coated tablet debossed with “Pfizer” on one side and “400” on the other; and a 500 mg red, oval, biconvex, film-coated tablet debossed with “Pfizer” on one side and “500” on the other. BOSULIF (bosutinib) tablets are available in the following packaging configurations (Table 11):

Table 11: Tablet Presentations

BOSULIF Tablets
Package Configuration	Tablet Strength (mg)	NDC	Tablet Description
120 tablets per bottle	100 mg	0069-0135-01	Yellow, oval, biconvex, film-coated tablets, debossed “Pfizer” on one side and “100” on the other.
30 tablets per bottle	400 mg	0069-0193-01	Orange, oval, biconvex, film-coated tablet debossed with “Pfizer” on one side and “400” on the other.
30 tablets per bottle	500 mg	0069-0136-01	Red, oval, biconvex, film-coated tablets, debossed “Pfizer” on one side and “500” on the other.
Abbreviation: NDC=National drug code.

Storage

Store at 20°C to 25°C (68°F to 77°F); excursions permitted to 15°C to 30°C (59°F to 86°F) [see USP Controlled Room Temperature].

Handling And Disposal

Procedures for proper disposal of anticancer drugs should be considered. Touching or handling crushed or broken tablets is to be avoided. Any unused product or waste material should be disposed of in accordance with local requirements, or drug take back programs.

The following clinically significant adverse reactions are discussed in greater detail in other sections of the labeling:

• Gastrointestinal toxicity [see WARNINGS AND PRECAUTIONS].
• Myelosuppression [see WARNINGS AND PRECAUTIONS].
• Hepatic toxicity [see WARNINGS AND PRECAUTIONS].
• Cardiovascular toxicity [see WARNINGS AND PRECAUTIONS]
• Fluid retention [see WARNINGS AND PRECAUTIONS].
• Renal toxicity [see WARNINGS AND PRECAUTIONS].

Clinical Trials Experience

Because clinical trials are conducted under widely varying conditions, adverse reaction 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.

The most common adverse reactions, in ≥20% of patients with newly diagnosed CP Ph+ CML or CP, AP, or BP Ph+ CML with resistance or intolerance to prior therapy (N=814) were diarrhea (80%), rash (44%), nausea (44%), abdominal pain (43%), vomiting (33%), fatigue (33%), hepatic dysfunction (33%), respiratory tract infection (25%), pyrexia (24%), and headache (21%).

The most common laboratory abnormalities that worsened from baseline in ≥20% of patients were creatinine increased (93%), hemoglobin decreased (90%), lymphocyte count decreased (72%), platelets decreased (69%), ALT increased (58%), calcium decreased (53%), white blood cell count decreased (52%), absolute neutrophils count decreased (50%), AST increased (50%), glucose increased (46%), phosphorus decreased (44%), urate increased (41%), alkaline phosphatase increased (40%), lipase increased (36%), creatine kinase increased (29%), and amylase increased (24%).

Adverse Reactions In Patients With Newly-Diagnosed CP CML

The clinical trial randomized and treated 533 patients with newly-diagnosed CP CML to receive BOSULIF 400 mg daily or imatinib 400 mg daily as single agents (Newly-Diagnosed CP CML Study) [see Clinical Studies]. The safety population (received at least 1 dose of BOSULIF) included:

• two hundred sixty-eight (268) patients with newly-diagnosed CP CML had a median duration of BOSULIF treatment of 55 months (range: 0.3 to 60 months) and a median dose intensity of 394 mg/day.

Serious adverse reactions occurred in 22% of patients with newly-diagnosed CP CML who received bosutinib. Serious adverse reactions reported in >2% of patients included hepatic dysfunction (4.1%), pneumonia (3.4%), coronary artery disease (3.4%), and gastroenteritis (2.2%). Fatal adverse reactions occurred in 3 patients (1.1%) due to coronary artery disease (0.4%), cardiac failure acute (0.4%), and renal failure (0.4%).

Permanent discontinuation of bosutinib due to an adverse reaction occurred in 20% of patients with newly-diagnosed CP CML who received bosutinib. Adverse reactions which resulted in permanent discontinuation in > 2% of patients included hepatic dysfunction (9%).

Permanent discontinuation of bosutinib due to an adverse reaction occurred in 20% of patients with newly-diagnosed CP CML who received bosutinib. Adverse reactions which resulted in permanent discontinuation in > 2% of patients included hepatic dysfunction (9%).

Dose modifications (dose interruption or reductions) of bosutinib due to an adverse reaction occurred in 68% of patients with newly-diagnosed CP CML. Adverse reactions which required dose interruptions or reductions in >5% of patients included hepatic dysfunction (27%), thrombocytopenia (16%), diarrhea (16%), lipase increased (10%), neutropenia (7%), abdominal pain (6%), rash (5%).

The most common adverse reactions, in >20% of bosutinib-treated patients with newly-diagnosed CML (N=268) were diarrhea (75%), hepatic dysfunction (45%), rash (40%), abdominal pain (39%), nausea (37%), fatigue (33%), respiratory tract infection (27%), headache (22%), and vomiting (21%).

The most common laboratory abnormalities that worsened from baseline in ≥20% of patients were creatinine increased (94%), hemoglobin decreased (89%), lymphocyte count decreased (84%), ALT increased (68%), platelet count decreased (68%), glucose increased (57%), AST increased (56%), calcium decreased (55%), phosphorus decreased (54%), lipase increased (53%), white blood cell count decreased (50%), absolute neutrophil count decreased (42%), alkaline phosphatase increased (41%), creatine kinase increased (36%), and amylase increased (32%).

Table 4 identifies adverse reactions greater than or equal to 10% for All Grades and Grades 3 or 4 (3/4) for the Phase 3 CP CML safety population.

Table 4: Adverse Reactions (10% or Greater) in Patients With Newly-Diagnosed CML in Bosutinib 400 mg Study*

System Organ Class	Preferred Term	Bosutinib 400 mg Chronic Phase CML (N=268)		Imatinib 400 mg Chronic Phase CML (N=265)
		All Grades %	Grade 3/4 %	All Grades %	Grade 3/4 %
Gastrointestinal disorders	Diarrhea	75	9	40	1
	Abdominal paina	39	2	27	1
	Nausea	37	0	42	0
	Vomiting	21	1	20	0
	Constipation	13	0	6	0
Hepatobiliary disorders	Hepatic dysfunctionf	45	27	15	4
Skin and subcutaneous tissue disorders	Rashd	40	2	30	2
	Pruritus	11	<1	4	0
General disorders and administration-site conditions	Fatigueb	33	1	30	<1
	Pyrexia	17	1	11	0
	Edemag	15	0	46	2
Infections and infestations	Respiratory tract infectione	27	1	25	<1
Nervous system disorders	Headache	22	1	15	1
Musculoskeletal and connective tissue disorders	Arthralgia	18	1	18	<1
	Back pain	12	<1	9	<1
Respiratory, thoracic, and mediastinal disorders	Cough	11	0	10	0
	Dyspnea	11	1	6	1
Metabolism and nutrition disorders	Decreased appetite	11	<1	6	0
Vascular disorders	Hypertensionc	10	5	11	5
*Based on a Minimum of 57 Months of Follow-up. Adverse drug reactions are based on all-causality treatment-emergent adverse events. The commonality stratification is based on ‘All Grades’ under Total column. ‘Grade 3’, ‘Grade 4’ columns indicate maximum toxicity. aAbdominal pain includes the following preferred terms: Abdominal discomfort, Abdominal pain, Abdominal pain lower, Abdominal pain upper, Abdominal tenderness, Dyspepsia, Epigastric discomfort, Gastrointestinal pain. bFatigue includes the following preferred terms: Asthenia, Fatigue, Malaise. cHypertension* includes the preferred terms: Blood pressure systolic increased, Hypertension, Hypertensive crisis, Hypertensive heart disease, Retinopathy hypertensive. fHepatic dysfunction includes the preferred terms: Alanine aminotransferase increased, Aspartate aminotransferase, Aspartate aminotransferase increased, Bilirubin conjugated increased, Blood alkaline phosphatase increased, Blood bilirubin increased, Drug-induced liver injury, Gamma-glutamyltransferase increased, Hepatic enzyme increased, Hepatic steatosis, Hepatitis, Hepatitis toxic, Hepatocellular injury, Hepatotoxicity, Hyperbilirubinemia, Jaundice, Liver disorder, Liver function test increased, Ocular icterus, Transaminases increased. gEdema includes the following preferred terms: Eye edema, Eyelid edema, Face edema, Edema, Edema peripheral, Orbital edema, Periorbital edema, Periorbital swelling, Peripheral swelling, Swelling, Swelling face, Swelling of eyelid, Swollen tongue. dRash includes the following preferred terms: Acne, Blister, Dermatitis, Dermatitis acneiform, Dermatitis bullous, Dermatitis exfoliative generalized, Drug reaction with eosinophilia and systemic symptoms, Dyshidrotic eczema, Eczema, Eczema asteatotic, Erythema, Erythema nodosum, Genital rash, Lichen planus, Perivascular dermatitis, Photosensitivity reaction, Psoriasis, Rash, Rash erythematous, Rash macular, Rash maculo-papular, Rash papular, Rash pruritic, Rash pustular, Rash vesicular, Seborrhoeic keratosis, Skin discoloration, Skin exfoliation, Skin hypopigmentation, Skin irritation, Skin lesion, Stasis dermatitis. eRespiratory tract infection includes the following preferred terms: Nasopharyngitis, Respiratory tract congestion, Respiratory tract infection, Respiratory tract infection viral, Upper respiratory tract infection.

In the randomized study in patients with newly-diagnosed CP CML, one patient in the group treated with BOSULIF experienced a Grade 3 QTcF prolongation (>500 msec). Patients with uncontrolled or significant cardiovascular disease including QT interval prolongation were excluded by protocol.

Table 5 identifies the clinically relevant or severe Grade 3/4 laboratory test abnormalities for the Phase 3 newly-diagnosed CML safety population.

Table 5: Select Laboratory Abnormalities (≥20%) That Worsened From Baseline in Patients with Newly-Diagnosed CML in Bosutinib 400 mg Study*

	Bosutinib N=268 %		Imatinib N=265 %
	All Grade	Grade 3-4	All Grade	Grade 3-4
Hematology Parameters
Platelet Count decreased	68	14	60	6
Absolute Neutrophil Count decreased	42	9	65	20
Hemoglobin decreased	89	9	90	7
White Blood Cell Count decreased	50	6	70	8
Lymphocyte Count decreased	84	12	82	14
Biochemistry Parameters
SGPT/ALT increased	68	26	28	3
SGOT/AST increased	56	13	29	3.4
Lipase increased	53	19	35	8
Phosphorus decreased	54	9	69	21
Amylase increased	32	3.4	18	2.3
Alkaline Phosphatase increased	41	0	43	0.4
Calcium decreased	55	1.5	57	1.1
Glucose increased	57	3	65	3.4
Creatine Kinase increased	36	3	65	5
Creatinine increased	94	1.1	98	0.8
*Based on a Minimum of 57 Months of Follow-up. Abbreviations: ALT=alanine aminotransferase; AST=aspartate aminotransferase; CML=chronic myelogenous leukemia; SGPT=serum glutamic-pyruvic transaminase; SGOT=serum glutamic-oxaloacetic transaminase; N/n=number of patients; ULN=upper limit of normal Graded using CTCAE v 4.03

Adverse Reactions In Patients With Imatinib-Resistant Or -Intolerant Ph+ CP, AP, And BP CML

The single-arm clinical trial enrolled patients with Ph+ CP, AP, or BP CML and with resistance or intolerance to prior therapy [see Clinical Studies]. The safety population (received at least 1 dose of BOSULIF) included 546 CML patients:

• two hundred eighty-four (284) patients with CP CML previously treated with imatinib only who had a median duration of BOSULIF treatment of 26 months (range: 0.2 to 155 months), and a median dose intensity of 437 mg/day.
• one hundred nineteen (119) patients with CP CML previously treated with both imatinib and at least 1 additional tyrosine kinase inhibitor (TKI) who had a median duration of BOSULIF treatment of 9 months (range: 0.2 to 148 months) and a median dose intensity of 427 mg/day.
• one hundred forty-three (143) patients with advanced phase (AdvP) CML including 79 patients with AP CML and 64 patients with BP CML. In the patients with AP CML and BP CML, the median duration of BOSULIF treatment was 10 months (range: 0.1 to 140 months) and 3 months (range: 0.03 to 71 months), respectively. The median dose intensity was 406 mg/day, and 456 mg/day, in the AP CML and BP CML cohorts, respectively.

Serious adverse reactions occurred in 30% of patients in the safety population of the single-arm trial in patients with CML (N=546) who were resistant or intolerant to prior therapy. Serious adverse reactions reported in >2% of patients included pneumonia (7%), pleural effusion (6%), pyrexia (3.7%), coronary artery disease (3.5%), dyspnea (2.6%), rash (2.2%), thrombocytopenia (2%), abdominal pain (2%), and diarrhea (2%).

Fatal adverse reactions occurred in 12 patients (2.2%) due to coronary artery disease (0.9%), pneumonia (0.4%), respiratory failure (0.4%), gastrointestinal hemorrhage (0.2%), acute kidney injury (0.2%), and acute pulmonary edema (0.2%).

Permanent discontinuation of bosutinib due to an adverse reaction occurred in 22% of patients with CML who were resistant or intolerant to prior therapy. Adverse reactions which resulted in permanent discontinuation in >2% of patients included thrombocytopenia (6%), hepatic dysfunction (3.3%), and neutropenia (2%).

Dose modifications (dose interruption or reductions) of bosutinib due to an adverse reaction occurred in 66% of patients with CML who were resistant or intolerant to prior therapy. Adverse reactions which required dose interruptions or reductions in >5% of patients included thrombocytopenia (24%), diarrhea (14%), rash (13%), hepatic dysfunction (10%), neutropenia (9%), pleural effusion (8%), vomiting (7%), anemia (6%), and abdominal pain (6%).

The most common adverse reactions, in ≥20% of patients in the safety population of the single-arm trial in patients with CML (N=546) who were resistant or intolerant to prior therapy were diarrhea (83%), nausea (47%), rash (46%), abdominal pain (45%), vomiting (39%), fatigue (33%), pyrexia (28%), hepatic dysfunction (27%), respiratory tract infection (24%), cough (23%), and headache (21%).

The most common laboratory abnormalities that worsened from baseline in ≥20% were creatinine increased (93%), hemoglobin decreased (91%), lymphocyte decreased (80%), platelets decreased (69%), absolute neutrophil count (54%), ALT increased (53%), calcium decreased (53%), white blood cell count decreased (52%), urate increased (48%), AST increased (47%), phosphorus decreased (39%), alkaline phosphatase increased (39%), lipase increased (28%), magnesium increased (25%), potassium decreased (24%), potassium increased (23%). See Table 7 for Grade 3/4 laboratory abnormalities.

Table 6 identifies adverse reactions greater than or equal to 10% for All Grades and Grades 3 or 4 for the Phase ½ CML safety population based on long-term follow-up.

Table 6: Adverse Reactions (10% or Greater) in Patients With CML Who Were Resistant or Intolerant to Prior Therapy in Single-Arm Trial^*

System Organ Class	Preferred Term	CP CML (N=403)		AdvP CML (N=143)
		All Grades %	Grade 3/4 %	All Grades %	Grade 3/4 %
Gastrointestinal disorders	Diarrhea	85	10	76	4
	Abdominal paina	49	2	36	7
	Nausea	47	1	48	2
	Vomiting	38	3	43	3
	Constipation	15	<1	17	1
Skin and subcutaneous tissue disorders	Rashe	48	9	42	5
	Pruritus	12	1	7	0
General disorders and administration-site conditions	Fatigue	35	3	27	6
	Pyrexia	25	1	37	3
	Edemac	19	<1	17	1
	Chest paing	8	1	12	1
Hepatobiliary disorders	Hepatic dysfunctionh	29	11	21	10
Infections and infestations	Respiratory tract infectionf	27	<1	17	0
	Influenzai	11	1	3	0
	Pneumoniad	10	4	18	12
Respiratory, thoracic, and mediastinal disorders	Cough	24	0	22	0
	Pleural effusion	14	4	9	4
	Dyspnea	12	2	20	6
Nervous system disorders	Headache	21	1	18	4
	Dizziness	11	0	14	1
Musculoskeletal and connective tissue disorders	Arthralgia	19	1	15	0
	Back pain	14	1	8	1
Metabolism and nutrition disorders	Decreased appetite	14	1	14	0
Vascular disorders	Hypertensionb	11	3	8	3
ADR Definition *Based on a Minimum of 105 Months of Follow-up. Adverse drug reactions are based on all-causality treatment-emergent adverse events. The commonality stratification is based on ‘All Grades’ under Total column. ‘Grade 3’, ‘Grade 4’ columns indicate maximum toxicity. aAbdominal pain includes the following preferred terms: Abdominal discomfort, Abdominal pain, Abdominal pain lower, Abdominal pain upper, Abdominal tenderness, Dyspepsia, Epigastric discomfort, Gastrointestinal pain, Hepatic pain. gChest pain includes the following preferred terms: Chest discomfort, Chest pain. hHepatic dysfunction includes the following preferred terms: Alanine aminotransferase increased, Aspartate aminotransferase increased, Bilirubin conjugated increased, Blood alkaline phosphatase increased, Blood bilirubin increased, Blood bilirubin unconjugated increased, Gamma-glutamyltransferase increased, Hepatic enzyme increased, Hepatic function abnormal, Hepatic steatosis, Hepatitis toxic, Hepatomegaly, Hepatotoxicity, Hyperbilirubinemia, Liver disorder, Liver function test abnormal, Liver function test increased, Transaminases increased. bHypertension* includes the following preferred terms: Blood pressure increased, Blood pressure systolic increased, Essential hypertension, Hypertension, Hypertensive crisis, Retinopathy hypertensive. iInfluenza includes the following preferred terms: H1N1 influenza, Influenza. cEdema includes the following preferred terms: Eye edema, Eyelid edema, Face edema, Generalized edema, Localized edema, Edema, Edema peripheral, Penile edema, Periorbital edema, Periorbital swelling, Peripheral swelling, Scrotal edema, Scrotal swelling, Swelling, Swelling face, Swelling of eyelid, Testicular edema, Tongue edema. dPneumonia includes the following preferred terms: Atypical pneumonia, Lower respiratory tract congestion, Lower respiratory tract infection, Pneumonia, Pneumonia aspiration, Pneumonia bacterial, Pneumonia fungal, Pneumonia necrotising, Pneumonia streptococcal. eRash includes the following preferred terms: Acarodermatitis, Acne, Angular cheilitis, Blister, Dermatitis, Dermatitis acneiform, Dermatitis psoriasiform, Drug eruption, Eczema, Eczema asteatotic, Erythema, Erythema annulare, Exfoliative rash, Lichenoid keratosis, Palmar erythema, Photosensitivity reaction, Pigmentation disorder, Psoriasis, Pyoderma gangrenosum, Pyogenic granuloma, Rash, Rash erythematous, Rash generalised, Rash macular, Rash maculo-papular, Rash pruritic, Rash pustular, Seborrhoeic dermatitis, Seborrhoeic keratosis, Skin depigmentation, Skin discoloration, Skin disorder, Skin exfoliation, Skin hyperpigmentation, Skin hypopigmentation, Skin irritation, Skin lesion, Skin plaque, Skin toxicity, Stasis dermatitis. fRespiratory tract infection includes the following preferred terms: Nasopharyngitis, Respiratory tract congestion, Respiratory tract infection, Respiratory tract infection viral, Upper respiratory tract infection, Viral upper respiratory tract infection. * ADR identified post-marketing.

In the single-arm study in patients with CML who were resistant or intolerant to prior therapy, 2 patients (0.4%) experienced QTcF interval of greater than 500 milliseconds. Patients with uncontrolled or significant cardiovascular disease including QT interval prolongation were excluded by protocol.

Table 7 identifies the clinically relevant or severe Grade 3/4 laboratory test abnormalities for the safety population of the study in patients with CML who were resistant or intolerant to prior therapy based on long-term follow-up.

Table 7: Number (%) of Patients With Clinically Relevant All Grade or Grade 3/4 Laboratory Test Abnormalities in the Safety Population of the Study of Patients With CML Who Were Resistant or Intolerant to Prior Therapy*

	CP CML N=403 %		AdvP CML N=143 %
	All grade	Grade 3/4	All grade	Grade 3/4
Hematology Parameters
Platelet Count decreased	66	26	80	57
Absolute Neutrophil Count decreased	50	16	66	39
Hemoglobin decreased	89	13	97	38
Lymphocyte decreased	79	14	82	21
White Blood Cell Count decreased	51	7	57	27
Biochemistry Parameters
SGPT/ALT increased	58	11	39	6
SGOT/AST increased	50	5	37	3.5
Lipase increased	32	12	19	6
Phosphorus decreased	41	8	33	7
Total Bilirubin increased	16	0.7	22	2.8
Creatinine increased	95	3	87	1.4
Alkaline Phosphatase increased	39	0	39	1.4
Glucose increased	42	2.7	39	6
Sodium increased	23	0.5	11	0
Sodium decreased	18	2.2	27	6
Calcium decreased	55	4.7	45	3.5
Urate increased	49	6	43	6
Magnesium increased	27	7	18	4.9
Potassium decreased	22	1.7	29	4.9
Potassium increased	25	2.7	19	2.1
*Based on a Minimum of 105 Months of Follow-up. Abbreviations: AdvP=advanced phase; ALT=alanine aminotransferase; AST=aspartate aminotransferase; CML=chronic myelogenous leukemia; CP=chronic phase; N/n=number of patients; SGPT=serum glutamate-pyruvate transaminase; SGOT=serum glutamate-oxaloacetate aminotransferase; ULN=upper limit of normal.

Additional Adverse Reactions From Multiple Clinical Trials

The following adverse reactions were reported in patients in clinical trials with BOSULIF (less than 10% of BOSULIF-treated patients). They represent an evaluation of the adverse reaction data from all 1372 patients with leukemia who received at least 1 dose of single-agent BOSULIF. These adverse reactions are presented by system organ class and are ranked by frequency. These adverse reactions are included based on clinical relevance and ranked in order of decreasing seriousness within each category.

Blood and Lymphatic System Disorders: 0.1% and less than 1% – Febrile neutropenia

Cardiac Disorders: 1% and less than 10% – Pericardial effusion; 0.1% and less than 1% – Pericarditis

Ear and Labyrinth Disorders: 1% and less than 10% – Tinnitus

Endocrine Disorders: 1% and less than 10% – Hypothyroidism; 0.1% and less than 1% – Hyperthyroidism

Gastrointestinal Disorders: 1% and less than 10% – Gastritis, Pancreatitis (includes Edematous pancreatitis, Pancreatic enzymes increased, Pancreatitis, Pancreatitis acute, Pancreatitis chronic), Gastrointestinal hemorrhage (includes Anal hemorrhage, Gastric hemorrhage, Gastrointestinal hemorrhage, Intestinal hemorrhage, Lower gastrointestinal hemorrhage, Rectal hemorrhage, Upper gastrointestinal hemorrhage)

General Disorders and Administrative Site Conditions: 1% and less than 10% – Pain

Immune System Disorders: 1% and less than 10% – Drug hypersensitivity; 0.1% and less than 1% – Anaphylactic shock

Infections and Infestations: 1% and less than 10% – Bronchitis

Investigations: 1% and less than 10% – Electrocardiogram QT prolonged (includes Electrocardiogram QT prolonged, Long QT syndrome)

Metabolism and Nutrition Disorders: 1% and less than 10% – Dehydration

Musculoskeletal and Connective Tissue Disorders: 1% and less than 10% – Myalgia

Nervous System Disorders: 1% and less than 10% – Dysgeusia

Renal and Urinary Disorders: 1% and less than 10% – Acute kidney injury, Renal impairment, Renal failure

Respiratory, Thoracic and Mediastinal Disorders: 1% and less than 10% – Pulmonary hypertension (includes Pulmonary hypertension, Pulmonary arterial hypertension, Pulmonary arterial pressure increased); 0.1% and less than 1% – Acute pulmonary edema (includes Acute pulmonary edema, Pulmonary edema), Respiratory failure

Skin and Subcutaneous Disorders: 0.1% and less than 1% – Erythema multiforme

Postmarketing Experience

The following additional adverse reactions have been identified during post-approval use of BOSULIF. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.

Blood and Lymphatic System Disorders: Thrombotic microangiopathy

Skin and Subcutaneous Tissue Disorders: Stevens-Johnson syndrome

DRUG INTERACTIONS

Effect Of Other Drugs On BOSULIF

Strong Or Moderate CYP3A Inhibitors

Concomitant use with a strong or moderate CYP3A inhibitor increased bosutinib Cmax and AUC compared to BOSULIF alone [see CLINICAL PHARMACOLOGY] which may increase the risk of toxicities. Avoid the concomitant use of strong or moderate CYP3A inhibitors with BOSULIF.

Strong CYP3A Inducers

Concomitant use with a strong CYP3A inducer decreased bosutinib Cmax and AUC compared to BOSULIF alone [see CLINICAL PHARMACOLOGY] which may reduce BOSULIF efficacy. Avoid the concomitant use of strong CYP3A inducers with BOSULIF.

Proton Pump Inhibitors (PPI)

Concomitant use with a PPI decreased bosutinib Cmax and AUC compared to BOSULIF alone [see CLINICAL PHARMACOLOGY] which may reduce BOSULIF efficacy. As an alternative to PPIs, use short-acting antacids or H2 blockers and separate dosing by more than 2 hours from BOSULIF dosing.

Included as part of the PRECAUTIONS section.

PRECAUTIONS

Gastrointestinal Toxicity

Diarrhea, nausea, vomiting, and abdominal pain occur with BOSULIF treatment. Monitor and manage patients using standards of care, including antidiarrheals, antiemetics, and fluid replacement.

In the randomized clinical trial in patients with newly-diagnosed Ph+ CML, the median time to onset for diarrhea (all grades) was 4 days and the median duration per event was 3 days.

Among 546 patients in a single-arm study in patients with CML who were resistant or intolerant to prior therapy, the median time to onset for diarrhea (all grades) was 2 days and the median duration per event was 2 days. Among the patients who experienced diarrhea, the median number of episodes of diarrhea per patient during treatment with BOSULIF was 3 (range 1-268).

To manage gastrointestinal toxicity, withhold, dose reduce, or discontinue BOSULIF as necessary [see DOSAGE AND ADMINISTRATION Â and ADVERSE REACTIONS].

Myelosuppression

Thrombocytopenia, anemia and neutropenia occur with BOSULIF treatment. Perform complete blood counts weekly for the first month of therapy and then monthly thereafter, or as clinically indicated. To manage myelosuppression, withhold, dose reduce, or discontinue BOSULIF as necessary [see DOSAGE AND ADMINISTRATION and ADVERSE REACTIONS].

Hepatic Toxicity

Bosutinib may cause elevations in serum transaminases (alanine aminotransferase [ALT], aspartate aminotransferase [AST]).

Two cases consistent with drug induced liver injury (defined as concurrent elevations in ALT or AST greater than or equal to 3×ULN with total bilirubin greater than 2×ULN and alkaline phosphatase less than 2×ULN) have occurred without alternative causes. This represented 2 out 1711 patients in BOSULIF clinical trials.

In the 268 patients from the safety population in the randomized clinical trial in patients with newly-diagnosed CML in the BOSULIF treatment group, the incidence of ALT elevation was 68.3% and AST elevation was 56.0%. Of patients who experienced transaminase elevations of any grade, 73% experienced their first event within the first 3 months. The median time to onset of increased ALT and AST was 29 and 56 days, respectively, and the median duration was 19 and 15 days, respectively.

Among the 546 patients in a single-arm study in patients with CML who were resistant or intolerant to prior therapy, the incidence of ALT elevation was 53.3% and AST elevation was 46.7%. Sixty percent of the patients experienced an increase in either ALT or AST. Most cases of transaminase elevations in this study occurred early in treatment; of patients who experienced transaminase elevations of any grade, more than 81% experienced their first event within the first 3 months. The median time to onset of increased ALT and AST was 22 and 29 days, respectively, and the median duration for each was 21 days.

Perform hepatic enzyme tests monthly for the first 3 months of BOSULIF treatment and as clinically indicated. In patients with transaminase elevations, monitor liver enzymes more frequently. Withhold, dose reduce, or discontinue BOSULIF as necessary [see DOSAGE AND ADMINISTRATION and ADVERSE REACTIONS].

Cardiovascular Toxicity

BOSULIF can cause cardiovascular toxicity including cardiac failure, left ventricular dysfunction, and cardiac ischemic events. Cardiac failure events occurred more frequently in previously treated patients than in patients with newly diagnosed CML and were more frequent in patients with advanced age or risk factors, including previous medical history of cardiac failure. Cardiac ischemic events occurred in both previously treated patients and in patients with newly diagnosed CML and were more common in patients with coronary artery disease risk factors, including history of diabetes, body mass index greater than 30, hypertension, and vascular disorders.

In a randomized study with newly diagnosed CML, cardiac failure occurred in 1.9% of patients treated with BOSULIF compared to 0.8% of patients treated with imatinib. Cardiac ischemic events occurred in 4.9% of patients treated with BOSULIF compared to 0.8% of patients treated with imatinib.

In a single-arm study in patients with CML who were resistant or intolerant to prior therapy, cardiac failure was observed in 5.3% of patients and cardiac ischemic events were observed in 4.9% of patients treated with BOSULIF.

Monitor patients for signs and symptoms consistent with cardiac failure and cardiac ischemia and treat as clinically indicated. Interrupt, dose reduce, or discontinue BOSULIF as necessary [see DOSAGE AND ADMINISTRATION].

Fluid Retention

Fluid retention occurs with BOSULIF and may manifest as pericardial effusion, pleural effusion, pulmonary edema, and/or peripheral edema.

In the randomized clinical trial of 268 patients with newly-diagnosed CML in the bosutinib treatment group, 3 patients (1.1%) experienced severe fluid retention of Grade 3, 1 patient experienced Grade 3 pericardial effusion, and 2 patients experienced Grade 3 pleural effusion. Among 546 patients in a single-arm study in patients with Ph+ CML who were resistant or intolerant to prior therapy, Grade 3 or 4 fluid retention was reported in 30 patients (6%). Some patients experienced more than one fluid retention event. Specifically, 24 patients experienced Grade 3 or 4 pleural effusions, 9 patients experienced Grade 3 or Grade 4 pericardial effusions, and 6 patients experienced Grade 3 edema.

Monitor and manage patients using standards of care. Interrupt, dose reduce or discontinue BOSULIF as necessary [see DOSAGE AND ADMINISTRATION and ADVERSE REACTIONS].

Renal Toxicity

An on-treatment decline in estimated glomerular filtration rate (eGFR) has occurred in patients treated with BOSULIF. Table 3 identifies the shift from baseline to lowest observed eGFR during BOSULIF therapy for patients in the pooled leukemia studies regardless of line of therapy. The median duration of therapy with BOSULIF was approximately 24 months (range, 0.03 to 155) for patients in these studies.

Table 3: Shift From Baseline to Lowest Observed eGFR Group During Treatment Safety Population in Clinical Studies (N=1372)*

Baseline		Follow-Up
Renal Function Status	N	Normal n (%)	Mild n (%)	Mild to Moderate n (%)	Moderate to Severe n (%)	Severe n (%)	Kidney Failure n (%)
Normal	527	115 (21.8)	330 (62.6)	50 (9.5)	23 (4.4)	3 (0.6)	5 (0.9)
Mild	672	10 (1.5)	259 (38.5)	271 (40.3)	96 (14.3)	26 (3.9)	6 (0.9)
Mild to Moderate	137	0	6 (4.4)	40 (29.2)	66 (48.2)	24 (17.5)	1 (0.7)
Moderate to Severe	33	0	1 (3.0)	1 (3.0)	8 (24.2)	19 (57.6)	4 (12.1)
Severe	1	0	0	0	0	0	1 (100)
Total	1370	125 (9.1)	596 (43.5)	362 (26.4)	193 (14.1)	72 (5.2)	17 (1.2)
Abbreviations: eGFR=estimated glomerular filtration rate; N/n=number of patients. Notes: eGFR was calculated using Modification in Diet in Renal Disease method (MDRD). Notes: Grading is based on Kidney Disease Improving Global Outcomes (KDIGO) Classification by eGFR: Normal: greater than or equal to 90, Mild: 60 to less than 90, Mild to Moderate: 45 to less than 60, Moderate to Severe: 30 to less than 45, Severe: 15 to less than 30, Kidney Failure: less than 15 ml/min/1.73 m². *Among the 1372 patients, eGFR was missing in 7 patients at baseline or on-therapy. There were no patients with kidney failure at baseline.

Monitor renal function at baseline and during therapy with BOSULIF, with particular attention to those patients who have preexisting renal impairment or risk factors for renal dysfunction. Consider dose adjustment in patients with baseline and treatment emergent renal impairment [see DOSAGE AND ADMINISTRATION].

Embryo-Fetal Toxicity

Based on findings from animal studies and its mechanism of action, BOSULIF can cause fetal harm when administered to a pregnant woman. There are no available data in pregnant women to inform the drug-associated risk. In animal reproduction studies conducted in rats and rabbits, oral administration of bosutinib during organogenesis caused adverse developmental outcomes, including structural abnormalities, embryo-fetal mortality, and alterations to growth at maternal exposures (AUC) as low as 1.2 times the human exposure at the dose of 500 mg/day. Advise pregnant women of the potential risk to a fetus. Advise females of reproductive potential to use effective contraception during treatment and for at least 2 weeks after the last dose [see Use In Specific Populations and CLINICAL PHARMACOLOGY].

Patient Counseling Information

Advise the patient to read the FDA-approved patient labeling (PATIENT INFORMATION).

Dosage And Administration

Instruct patients to take BOSULIF exactly as prescribed, not to change their dose or to stop taking BOSULIF unless they are told to do so by their doctor. If patients miss a dose beyond 12 hours, they should be advised to take the next scheduled dose at its regular time. A double dose should not be taken to make up for any missed dose. Advise patients to take BOSULIF with food. Patients should be advised: “Do not crush, break, or cut tablet. Do not touch or handle crushed or broken tablets.”

Gastrointestinal Toxicity

Advise patients that they may experience diarrhea, nausea, vomiting, abdominal pain, or blood in their stools with BOSULIF and to seek medical attention promptly for these symptoms [see WARNINGS AND PRECAUTIONS].

Myelosuppression

Advise patients of the possibility of developing low blood cell counts and to immediately report fever, any suggestion of infection, or signs or symptoms suggestive of bleeding or easy bruising [see WARNINGS AND PRECAUTIONS].

Hepatic Toxicity

Advise patients of the possibility of developing liver function abnormalities and to immediately report jaundice [see WARNINGS AND PRECAUTIONS].

Cardiovascular Toxicity

Advise patients that cardiac failure, left ventricular dysfunction, and cardiac ischemic events have been reported. Advise patients to seek immediate medical attention if any symptoms suggestive of cardiac failure and cardiac ischemia occur, such as shortness of breath, weight gain, or fluid retention [see WARNINGS AND PRECAUTIONS].

Fluid Retention

Advise patients of the possibility of developing fluid retention (swelling, weight gain, or shortness of breath) and to seek medical attention promptly if these symptoms arise [see WARNINGS AND PRECAUTIONS].

Renal Toxicity

Advise patients of the possibility of developing renal problems and to immediately report frequent urination, polyuria or oliguria [see WARNINGS AND PRECAUTIONS].

Adverse Reactions

Advise patients that they may experience other adverse reactions such as respiratory tract infections, rash, fatigue, loss of appetite, headache, dizziness, back pain, arthralgia, or pruritus with BOSULIF and to seek medical attention if symptoms are significant. There is a possibility of anaphylactic shock [see CONTRAINDICATIONS and ADVERSE REACTIONS].

Embryo-Fetal Toxicity

Advise females to inform their healthcare provider if they are pregnant or become pregnant. Inform female patients of the risk to a fetus and potential loss of the pregnancy [see Use In Specific Populations].

Advise females of reproductive potential, to use effective contraception during treatment and for at least 2 weeks after receiving the last dose of BOSULIF [see WARNINGS AND PRECAUTIONS and Use In Specific Populations].

Advise lactating women not to breastfeed during treatment with BOSULIF and for at least 2 weeks after the last dose [see Use In Specific Populations].

Drug Interactions

Advise patients that BOSULIF and certain other medicines, including over the counter medications or herbal supplements (such as St. John’s wort) can interact with each other and may alter the effects of BOSULIF [see DRUG INTERACTIONS].

Nonclinical Toxicology

Carcinogenesis, Mutagenesis, Impairment Of Fertility

Bosutinib was not carcinogenic in rats or transgenic mice. The rat 2-year carcinogenicity study was conducted at bosutinib oral doses up to 25 mg/kg in males and 15 mg/kg in females. Exposures at these doses were approximately 1.5 times (males) and 3.1 times (females) the human exposure at the 400 mg dose and 1.2 times (males) and 2.4 times (females) exposure in humans at the 500 mg dose. The 6-month RasH2 transgenic mouse carcinogenicity study was conducted at bosutinib oral doses up to 60 mg/kg.

Bosutinib was not mutagenic or clastogenic in a battery of tests, including the bacteria reverse mutation assay (Ames Test), the in vitro assay using human peripheral blood lymphocytes and the micronucleus test in orally treated male mice.

In a rat fertility study, drug-treated males were mated with untreated females, or untreated males were mated with drug-treated females. Females were administered the drug from pre-mating through early embryonic development. The dose of 70 mg/kg/day of bosutinib resulted in reduced fertility in males as demonstrated by 16% reduction in the number of pregnancies. There were no lesions in the male reproductive organs at this dose. This dose of 70 mg/kg/day resulted in exposure (AUC) in male rats approximately 1.5 times and equal to the human exposure at the recommended doses of 400 and 500 mg/day, respectively. Fertility (number of pregnancies) was not affected when female rats were treated with bosutinib. However, there were increased embryonic resorptions at greater than or equal to 10 mg/kg/day of bosutinib (1.6 and 1.2 times the human exposure at the recommended doses of 400 and 500 mg/day, respectively), and decreased implantations and reduced number of viable embryos at 30 mg/kg/day of bosutinib (3.4 and 2.5 times the human exposure at the recommended doses of 400 or 500 mg/day, respectively).

Use In Specific Populations

Pregnancy

Risk Summary

Based on findings from animal studies and its mechanism of action, BOSULIF can cause fetal harm when administered to a pregnant woman [see CLINICAL PHARMACOLOGY].

There are no available data in pregnant women to inform the drug-associated risk. In animal reproduction studies conducted in rats and rabbits, oral administration of bosutinib during organogenesis caused adverse developmental outcomes, including structural abnormalities, embryo-fetal mortality, and alterations to growth at maternal exposures (AUC) as low as 1.2 times the human exposure at the dose of 500 mg/day (see Data). Advise pregnant women of the potential risk to a fetus.

The background risk of major birth defects and miscarriage for the indicated population is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies are 2-4% and 15-20%, respectively.

Data

Animal Data

In a rat fertility and early embryonic development study, bosutinib was administered orally to female rats for approximately 3 to 6 weeks, depending on day of mating (2 weeks prior to cohabitation with untreated breeder males until gestation day [GD] 7). Increased embryonic resorptions occurred at greater than or equal to 10 mg/kg/day of bosutinib (1.6 and 1.2 times the human exposure at the recommended doses of 400 or 500 mg/day, respectively), and decreased implantations and reduced number of viable embryos at 30 mg/kg/day of bosutinib (3.4 and 2.5 times the human exposure at the recommended doses of 400 or 500 mg/day, respectively).

In an embryo-fetal development study conducted in rabbits, bosutinib was administered orally to pregnant animals during the period of organogenesis at doses of 3, 10, and 30 mg/kg/day. At the maternally-toxic dose of 30 mg/kg/day of bosutinib, there were fetal anomalies (fused sternebrae, and 2 fetuses had various visceral observations), and an approximate 6% decrease in fetal body weight. The dose of 30 mg/kg/day resulted in exposures (AUC) approximately 5.1 and 3.8 times the human exposures at the recommended doses of 400 and 500 mg/day, respectively.

Fetal exposure to bosutinib-derived radioactivity during pregnancy was demonstrated in a placental-transfer study in pregnant rats. In a rat pre-and postnatal development study, bosutinib was administered orally to pregnant animals during the period of organogenesis through lactation day 20 at doses of 10, 30, and 70 mg/kg/day. Reduced number of pups born occurred at greater than or equal to 30 mg/kg/day bosutinib (3.4 and 2.5 times the human exposure at the recommended doses of 400 or 500 mg/day, respectively), and increased incidence of total litter loss and decreased growth of offspring after birth occurred at 70 mg/kg/day bosutinib (6.9 and 5.1 times the human exposure at the recommended doses of 400 or 500 mg/day, respectively).

Lactation

Risk Summary

No data are available regarding the presence of bosutinib or its metabolites in human milk or its effects on a breastfed child or on milk production. However, bosutinib is present in the milk of lactating rats. Because of the potential for serious adverse reactions in a nursing child, breastfeeding is not recommended during treatment with BOSULIF and for at least 2 weeks after the last dose.

Animal Data

After a single radiolabeled bosutinib dose to lactating rats, radioactivity was present in the plasma of suckling offspring for 24 to 48 hours.

Females And Males Of Reproductive Potential

Pregnancy

Based on findings from animal studies, BOSULIF can cause fetal harm when administered to a pregnant woman [see Use In Specific Populations]. Females of reproductive potential should have a pregnancy test prior to starting treatment with BOSULIF.

Contraception

Females

Based on findings from animal studies, BOSULIF can cause fetal harm when administered to a pregnant woman [see Use In Specific Populations]. Advise females of reproductive potential to use effective contraception (methods that result in less than 1% pregnancy rates) during treatment with BOSULIF and for at least 2 weeks after the last dose.

Infertility

The risk of infertility in females or males of reproductive potential has not been studied in humans. Based on findings from animal studies, BOSULIF may cause reduced fertility in females and males of reproductive potential [see Nonclinical Toxicology].

Pediatric Use

The safety and efficacy of BOSULIF in patients less than 18 years of age have not been established.

Geriatric Use

In the single-arm study in patients with CML who were resistant or intolerant to prior therapy of BOSULIF in patients with Ph+ CML, 20% were age 65 and over, 4% were 75 and over. Of the 268 patients who received bosutinib in the study for newly diagnosed CML, 20% were age 65 and over, 5% were 75 and over. No overall differences in safety or effectiveness were observed between these patients and younger patients, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.

Renal Impairment

Reduce the BOSULIF starting dose in patients with moderate (creatinine clearance [CLcr] 30 to 50 mL/min, estimated by Cockcroft-Gault (C-G)) and severe (CLcr less than 30 mL/min, C-G) renal impairment at baseline. For patients who have declining renal function while on BOSULIF who cannot tolerate the starting dose, follow dose adjustment recommendations for toxicity [see DOSAGE AND ADMINISTRATION and CLINICAL PHARMACOLOGY]. BOSULIF has not been studied in patients undergoing hemodialysis.

Hepatic Impairment

Reduce the BOSULIF dosage in patients with hepatic impairment (Child-Pugh A, B, or C) [see DOSAGE AND ADMINISTRATION and CLINICAL PHARMACOLOGY].

Experience with BOSULIF overdose in clinical studies was limited to isolated cases. There were no reports of any serious adverse events associated with the overdoses. Patients who take an overdose of BOSULIF should be observed and given appropriate supportive treatment.

Contraindications

BOSULIF is contraindicated in patients with a history of hypersensitivity to BOSULIF. Reactions have included anaphylaxis [see ADVERSE REACTIONS].

Mechanism Of Action

Bosutinib is a TKI. Bosutinib inhibits the BCR-ABL kinase that promotes CML; it is also an inhibitor of Src-family kinases including Src, Lyn, and Hck. Bosutinib inhibited 16 of 18 imatinib-resistant forms of BCR-ABL kinase expressed in murine myeloid cell lines. Bosutinib did not inhibit the T315I and V299L mutant cells.

Pharmacodynamics

Based on the exposure response analyses for efficacy, a relationship between drug exposure and a greater likelihood of response was observed in clinical studies. Based on the exposure response analyses for safety, a relationship between drug exposure and a greater likelihood of safety events was observed in clinical studies.

Cardiac Electrophysiology

At a single oral dose of 500 mg BOSULIF with ketoconazole (a strong CYP3A inhibitor), BOSULIF does not prolong the QT interval to any clinically relevant extent.

Pharmacokinetics

The bosutinib pharmacokinetics following oral dosing was assessed with food, unless otherwise specified.

Bosutinib exhibits dose proportional increases in AUC and Cmax over the oral dose range of 200 to 800 mg (0.33 to 1.3 times the maximum approved recommended dosage of 600 mg). The mean (standard deviation [SD]) Cmax was 146 (20) ng/mL and the mean (SD) AUC was 2720 (442) ng•h/mL following multiple oral doses of BOSULIF 400 mg in patients with CML; Cmax was 200 (12) ng/mL and AUC was 3650 (425) ng•h/mL following multiple oral doses of BOSULIF 500 mg in patients with CML.

Absorption

Following administration of a single oral dose of BOSULIF 500 mg with food in patients with CML, the median (minimum, maximum) time-to-peak concentration (tmax) was 6.0 (6.0, 6.0) hours. The absolute bioavailability was 34% in healthy subjects.

Effect Of Food

When given with a high fat meal in healthy subjects, oral bosutinib Cmax increased 1.8-fold and AUC increased 1.7-fold. The high-fat meal (800-1000 total calories) consisted of approximately 150 protein calories, 250 carbohydrate calories, and 500-600 fat calories.

Distribution

Following a single intravenous dose of bosutinib 120 mg (0.2 times the maximum approved recommended oral dosage of 600 mg) in healthy subjects, bosutinib had a mean (SD) volume of distribution of 2441 (796) L. The mean (SD) apparent volume of distribution after an oral dose of 500 mg of BOSULIF to patients with CML was 6080 (1230) L. Protein binding of bosutinib is 94% in vitro and 96% ex vivo, and is independent of concentration.

Elimination

Following a single intravenous dose of bosutinib 120 mg (0.2 times the maximum approved recommended oral dosage of 600 mg), the mean (SD) terminal phase elimination half-life (t½) was 35.5 (8.5) hours, and the mean (SD) clearance (Cl) was 63.6 (14.1) L/h. Following a single oral dose of BOSULIF in patients with CML, the mean (SD) t½ was 22.5 (1.7) hours, and the mean (SD) Cl was 189 (48) L/h.

Metabolism

Bosutinib is primarily metabolized by CYP3A4.

Excretion

Following a single oral dose of [¹⁴C] radiolabeled bosutinib without food, 91.3% of the dose was recovered in feces and 3.3% of the dose recovered in urine.

Specific Populations

Patients With Renal Impairment

Following a single oral dose of BOSULIF 200 mg (0.33 times the maximum approved recommended dosage of 600 mg), bosutinib AUC increased 1.4-fold in subjects with moderate renal impairment (CLcr: 30 to 50 mL/min, estimated by Cockcroft-Gault (C-G)) and increased 1.6-fold in subjects with severe renal impairment (CLcr less than 30 mL/min) compared to subjects with normal renal function (CLcr > 80 mL/min, C-G). No clinically significant difference in the pharmacokinetics of bosutinib was observed in subjects with mild renal impairment (CLcr: 51 to 80 mL/min, C-G).

Patients With Hepatic Impairment

Following a single oral dose of BOSULIF 200 mg (0.33 times the maximum approved recommended dosage of 600 mg), bosutinib Cmax increased 2.4-fold, 2-fold, and 1.5-fold, and AUC increased 2.3-fold, 2-fold, and 1.9-fold in hepatic impairment Child-Pugh A, B, and C, respectively.

Drug Interaction Studies

Clinical Studies

The following interactions were evaluated in crossover studies of healthy subjects, unless otherwise specified.

Strong And Moderate CYP3A Inhibitors

A single oral dose of BOSULIF 100 mg (0.17 times the maximum approved recommended dosage) was administered alone or following multiple daily doses of 400 mg ketoconazole (a strong CYP3A inhibitor) without food. Ketoconazole increased bosutinib Cmax and AUC 5.2-fold and 8.6-fold, respectively.

A single oral dose of BOSULIF 500 mg was administered alone or in combination with 125 mg aprepitant (a moderate CYP3A inhibitor) with food. Aprepitant increased bosutinib Cmax 1.5-fold and AUC 2.0-fold.

Strong CYP3A Inducers

A single dose of BOSULIF 500 mg was administered alone or following multiple daily doses of 600 mg rifampin with food. Rifampin decreased bosutinib Cmax by 86% and AUC by 94%.

Proton Pump Inhibitors

BOSULIF displays pH-dependent aqueous solubility, in vitro. A single oral dose of BOSULIF 400 mg was administered alone or following multiple oral doses of lansoprazole 60 mg without food. Lansoprazole decreased bosutinib Cmax by 46% and AUC by 26%.

P-gp Substrates

A single oral dose of 500 mg BOSULIF was administered in combination with a single oral dose of 150 mg dabigatran etexilate mesylate (a P-glycoprotein (P-gp) substrate). No clinically significant difference in the pharmacokinetics of dabigatran was observed following bosutinib administration.

In Vitro Studies

Bosutinib Effect On Transporters

Bosutinib may have the potential to inhibit breast cancer resistance protein (BCRP) in the gastrointestinal tract but has a low potential to inhibit BCRP, systemically, or organic anion transporting polypeptide (OATP)1B1, OATP1B3, organic anion transporter (OAT)1, OAT3, organic cation transporter (OCT)1, and OCT2 at clinically relevant concentrations.

Clinical Studies

Newly-Diagnosed CP Ph+ CML

The efficacy of BOSULIF in patients with newly-diagnosed chronic phase Ph+ CML was evaluated in the Bosutinib trial in First-line chrOnic myelogenous leukemia tREatment (BFORE) Trial: “A Multicenter Phase 3, Open-Label Study of Bosutinib Versus Imatinib in Adult Patients With Newly Diagnosed Chronic Phase Chronic Myelogenous Leukemia” [NCT02130557].

The BFORE Trial is a 2-arm, open-label, randomized, multicenter trial conducted to investigate the efficacy and safety of BOSULIF 400 mg once daily alone compared with imatinib 400 mg once daily alone in adult patients with newly-diagnosed CP Ph+ CML. The trial randomized 536 patients (268 in each arm) with Ph+ or Ph- newly-diagnosed CP CML (intent-to-treat [ITT] population) including 487 patients with Ph+ CML harboring b2a2 and/or b3a2 transcripts at baseline and baseline BCR-ABL copies >0 (modified intent-to-treat [mITT] population). Randomization was stratified by Sokal score and geographical region. All patients are being treated and/or followed for up to 5 years (240 weeks). Efficacy was evaluated in the mITT population. The major efficacy outcome measure was major molecular response (MMR) at 12 months (48 weeks) defined as ≤0.1% BCR-ABL ratio on international scale (corresponding to ≥3 log reduction from standardized baseline) with a minimum of 3000 ABL transcripts as assessed by the central laboratory. Additional efficacy outcomes included CCyR by 12 months, defined as the absence of Ph+ metaphases in chromosome banding analysis of ≥20 metaphases derived from bone marrow aspirate or MMR if an adequate cytogenetic assessment was unavailable and MMR by 18 months (72 weeks).

In the mITT population in this study, 57% of patients were males, 78% were Caucasian, and 19% were 65 years or older. The median age was 53 years. At baseline, the distribution of Sokal risk scores was similar in bosutinib and imatinib-treated patients (low risk: 35% and 39%; intermediate risk: 44% and 38%; high risk: 22% and 22%, respectively). After a minimum of 12 months follow-up, 78% of the 246 bosutinib-treated patients and 72% of the 239 imatinib-treated patients were still receiving treatment and with a minimum of 60 months of follow-up, 60% and 60% of patients, respectively, were still receiving treatment. The median treatment duration was 55.1 months for BOSULIF and 55.0 months for imatinib. The efficacy results from the BFORE trial are summarized in Table 8.

Table 8: Summary of Major Molecular Response (MMR) and Complete Cytogenetic Response (CCyR), by Treatment Group in the Modified Intent-to-Treat (mITT) Population

Response	Bosutinib N=246 n (%)	Imatinib N=241 n (%)	2-sided p-value
MMR at Month 12 (Week 48)
MMR (%)	116 (47)	89 (37)	0.0200*
(95% CI)	(41, 53)	(31, 43)
CCyR by Month 12 (Week 48)
CCyR (%)	190 (77)	160 (66)
(95% CI)	(72, 83)	(60, 72)	0.0075*
MMR by Month 18 (Week 72)
MMR (%)	150 (61)	127 (53)
(95% CI)	(55, 67)	(46, 59)	0.0606*
Abbreviations: CCyR=complete cytogenetic response; CI=confidence interval; CMH=Cochran-Mantel-Haenszel; MMR=major molecular response; N/n=number of patients. * Derived from CMH test stratified by Geographical region and Sokal score at randomization.

The MMR rate at Month 12 for all randomized patients (ITT population) was consistent with the mITT population (47% [95% CI: 41, 53] in the bosutinib treatment group and 36% [95% CI: 30, 42] in the imatinib treatment group; odds ratio of 1.57 [95% CI: 1.10, 2.22]). MMR by Month 60 (Week 240) in the mITT population was 74% (95% CI: 69, 80) in the bosutinib treatment group and 66% (95% CI: 60, 72) in the imatinib treatment group; odds ratio of 1.52 (95% CI: 1.02, 2.25). MMR by Month 60 in the ITT population was also consistent with the mITT population (1.57 [95% CI: 1.08, 2.28]).

After 60 months of follow-up, the median time to MMR in responders was 9.0 months for bosutinib and 11.9 months for imatinib.

By 60 months, the MMR rates in each Sokal risk group for the bosutinib and imatinib-treated patients, respectively, were 78% and 72% for low risk, 74% and 67% for intermediate risk and 68% and 52% for high risk.

After 60 months of follow-up, 6 (2%) bosutinib patients and 7 (3%) imatinib patients transformed to AP CML or BP CML while on treatment.

At 60 months, the estimated overall survival rate was 95% (95% CI: 91, 97) in the bosutinib group and 94% (95% CI: 90, 96) in the imatinib group.

Imatinib-Resistant Or -Intolerant Ph+ CP, AP, And BP CML

Study 200 (NCT00261846), a single-arm, open-label, multicenter study in patients with CML who were resistant or intolerant to prior therapy was conducted to evaluate the efficacy and safety of BOSULIF 500 mg once daily in patients with imatinib-resistant or -intolerant CML with separate cohorts for CP, AP, and BP disease previously treated with 1 prior TKI (imatinib) or more than 1 TKI (imatinib followed by dasatinib and/or nilotinib). The definition of imatinib resistance included (1) failure to achieve or maintain any hematologic improvement within 4 weeks; (2) failure to achieve a CHR by 3 months, cytogenetic response by 6 months or major cytogenetic response (MCyR) by 12 months; (3) progression of disease after a previous cytogenetic or hematologic response; or (4) presence of a genetic mutation in the BCR-ABL gene associated with imatinib resistance. Imatinib intolerance was defined as inability to tolerate imatinib due to toxicity, or progression on imatinib and inability to receive a higher dose due to toxicity. The definitions of resistance and intolerance to both dasatinib and nilotinib were similar to those for imatinib. The protocol was amended to exclude patients with a known history of the T315I mutation after 396 patients were enrolled in the trial.

The efficacy endpoints for patients with CP CML previously treated with 1 prior TKI (imatinib) were the rate of attaining MCyR by Week 24 and the duration of MCyR. The efficacy endpoints for patients with CP CML previously treated with both imatinib and at least 1 additional TKI were the cumulative rate of attaining MCyR by Week 24 and the duration of MCyR. The efficacy endpoints for patients with previously treated AP and BP CML were confirmed CHR and overall hematologic response (OHR).

The study enrolled 546 patients with CP, AP or BP CML. Of the total patient population 73% were imatinib resistant and 27% were imatinib intolerant. In this trial, 53% of patients were males, 65% were Caucasian, and 20% were 65 years old or older. Of the 546 treated patients, 506 were considered evaluable for cytogenetic or hematologic efficacy assessment. Patients were evaluable for efficacy if they had received at least 1 dose of BOSULIF and had a valid baseline efficacy assessment. Among evaluable patients, there were 262 patients with CP CML previously treated with 1 prior TKI (imatinib), 112 patients with CP CML previously treated with both imatinib and at least 1 additional TKI, and 132 patients with advanced phase CML previously treated with at least 1 TKI.

Median duration of BOSULIF treatment was 26 months in patients with CP CML previously treated with 1 TKI (imatinib), 9 months in patients with CP CML previously treated with imatinib and at least 1 additional TKI, 10 months in patients with AP CML previously treated with at least imatinib, and 3 months in patients with BP CML previously treated with at least imatinib.

The 24 week efficacy and MCyR at any time results are summarized in Table 9.

Table 9: Efficacy Results in Patients with Ph+ CP CML With Resistance to or Intolerance to Imatinib

	Prior Treatment With Imatinib Only (N=262 evaluable) n (%)	Prior Treatment With Imatinib and Dasatinib or Nilotinib (N=112 evaluable) n (%)
By Week 24
MCyR	105 (40.1)	29 (25.9)
(95% CI)	(34.1, 46.3)	(18.1, 35.0)
MCyR any time	156 (59.5)	45 (40.2)
	(53.3, 65.5)	(31.0, 49.9)
Abbreviations: CI=confidence interval; CML=chronic myelogenous leukemia; CP=chronic phase; MCyR=major cytogenetic response; N/n=number of patients; Ph+=Philadelphia chromosome positive.

The long term follow-up data analysis was based on a minimum of 60 months for patients with CP CML treated with 1 prior TKI (imatinib) and a minimum of 48 months for patients with CP CML treated with imatinib and at least 1 additional TKI. For the 59.5% of patients with CP CML treated with 1 prior TKI (imatinib) who achieved a MCyR at any time, the median duration of MCyR was not reached. Among these patients, 65.4% and 42.9% had a MCyR lasting at least 18 and 54 months, respectively. For the 40.2% of patients with CP CML treated with imatinib and at least 1 additional TKI who achieved a MCyR at any time, the median duration of MCyR was not reached. Among these patients, 64.4% and 35.6% had a MCyR lasting at least 9 and 42 months, respectively. Of the 403 treated patients with CP CML, 20 patients had confirmed disease transformation to AP or BP while on treatment with BOSULIF.

The 48 week efficacy results in patients with accelerated and blast phases CML previously treated with at least imatinib are summarized in Table 10.

Table 10: Efficacy Results in Patients With Accelerated Phase and Blast Phase CML Previously Treated With at Least Imatinib

	AP CML (N=72 evaluable) n (%)	BP CML (N=60 evaluable) n (%)
CHRa by Week 48	22 (30.6)	10 (16.7)
(95% CI)	(20.2, 42.5)	(8.3, 28.5)
OHRa by Week 48	41 (56.9)	17 (28.3)
(95% CI)	(44.7, 68.6)	(17.5, 41.4)
Abbreviations: AP=accelerated phase; BP=blast phase; CHR=complete hematologic response; CI=confidence interval; CML=chronic myelogenous leukemia; CI=confidence interval, OHR=overall hematologic response, CHR=complete hematologic response, N/n=number of patients a Overall hematologic response (OHR) = major hematologic response (complete hematologic response + no evidence of leukemia) or return to chronic phase (RCP). All responses were confirmed after 4 weeks. Complete hematologic response (CHR) for AP and BP CML: WBC less than or equal to institutional ULN, platelets greater than or equal to 100,000/mm³ and less than 450,000/mm³, absolute neutrophil count (ANC) greater than or equal to 1.0 x109 /L, no blasts or promyelocytes in peripheral blood, less than 5% myelocytes + metamyelocytes in bone marrow, less than 20% basophils in peripheral blood, and no extramedullary involvement. No evidence of leukemia (NEL): Meets all other criteria for CHR except may have thrombocytopenia (platelets greater than or equal to 20,000/mm³ and less than 100,000/mm³) and/or neutropenia (ANC greater than or equal to 0.5×109 /L and less than 1.0×109 /L). Return to chronic phase (RCP) = disappearance of features defining accelerated or blast phases but still in chronic phase.

The long term follow-up data analysis was based on a minimum of 48 months for patients with AP CML and BP CML. Of the 79 treated patients with AP CML, 3 patients had confirmed disease transformation to BP while on BOSULIF treatment.