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.
A greater likelihood of response and a greater likelihood of safety events were observed with higher bosutinib exposure in clinical studies. The time course of bosutinib pharmacodynamic response has not been fully characterized.
Bosutinib pharmacokinetics were assessed following oral dosing with food in adult patients with CML and were presented as geometric mean (CV%), unless otherwise specified.
Bosutinib exhibits dose proportional increases in Cmax and AUC over the oral dose range of 200 to 800 mg (0.33 to 1.3 times the maximum approved recommended dosage of 600 mg). Bosutinib steady state Cmax was 127 ng/mL (31%), Ctrough was 68 ng/mL (39%) and AUC was 2370 ng•h/mL (34%) following multiple oral doses of BOSULIF 400 mg; Bosutinib steady state Cmax was 171 ng/mL (38%), Ctrough was 91 ng/mL (42%) and AUC was 3150 ng•h/mL (38%) following multiple oral doses of BOSULIF 500 mg. No clinically significant differences in the pharmacokinetics of bosutinib were observed following administration of either the tablet or capsule dosage forms of BOSULIF at the same dose, under fed conditions.
Absorption
The median bosutinib (minimum, maximum) time-‑to-Cmax (tmax) was 6.0 (6.0, 6.0) hours following oral administration of a single oral dose of BOSULIF 500 mg with food. The absolute bioavailability was 34% in healthy subjects.
Effect of Food
Bosutinib Cmax increased 1.8-fold and AUC increased 1.7-fold when BOSULIF tablets were given with a high fat meal to healthy subjects compared to administration under fasted condition. Bosutinib Cmax increased 1.6‑fold and AUC increased 1.5-fold when BOSULIF capsules were given with a high fat meal to healthy subjects compared to administration under fasted condition. The high-fat meal (800-1000 total calories) consisted of approximately 150 protein calories, 250 carbohydrate calories, and 500-600 fat calories.
No clinically significant differences in the pharmacokinetics of bosutinib were observed following administration of a BOSULIF capsule that was opened and the contents mixed with applesauce or yogurt immediately before use.
Distribution
The mean (SD) apparent bosutinib volume of distribution is 6080 (1230) L after an oral dose of 500 mg of BOSULIF.
Bosutinib protein binding is 94% in vitro and 96% ex vivo, and is independent of concentration.
Elimination
The mean (SD) bosutinib terminal phase elimination half life (t½) was 22.5 (1.7) hours, and the mean (SD) apparent clearance was 189 (48) L/h following a single oral dose of BOSULIF.
Specific Populations
Patients with Renal Impairment
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) following a single oral dose of BOSULIF 200 mg (0.33 times the maximum approved recommended dosage of 600 mg). 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). BOSULIF has not been studied in patients undergoing hemodialysis.
Patients with Hepatic Impairment
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, following a single oral dose of BOSULIF 200 mg (0.33 times the maximum approved recommended dosage of 600 mg).
Pediatric Patients
The pharmacokinetics of bosutinib in 27 pediatric patients aged 4 to less than 17 years with newly diagnosed CP Ph+ CML or resistant/intolerant CP Ph+ CML were evaluated over the dose range of 300 mg/m2 to 400 mg/m2 administered orally once daily with food. Exposures increased in a dose proportional manner over the dose range of 300 mg/m2 to 400 mg/m2. The bosutinib median (min, max) tmax is approximately 3 hours post-dose (1, 8 hours). In 15 pediatric patients aged 4 to less than 17 years who received 300 mg/m2 daily, steady state Cmax was 159 ng/mL (42%), Ctrough was 49 ng/mL (53%) and AUC was 2027 ng•h/mL (47%). In 6 pediatric patients aged 6 to less than 17 years who received 400 mg/m2 daily, steady state Cmax was 198 ng/mL (37%), Ctrough was 42 ng/mL (105%), and AUC was 2514 ng•h/mL (35%).
An increase in BSA correlated with an increase in apparent clearance and exposure metrics did not significantly differ across BSA or age in pediatric patients following the approved recommended BSA-based dosage.
Drug Interaction Studies
Strong CYP3A Inhibitors:
Bosutinib Cmax increased 5.2-fold and AUC increased 8.6-foldfollowing a single dose of BOSULIF 100 mg (0.17 times the maximum approved recommended dosage) without food when used concomitantly with 400 mg ketoconazole (a strong CYP3A inhibitor) administered over multiple daily doses.
Moderate CYP3A Inhibitors: Bosutinib Cmax increased 1.5-fold and AUC increased 2.0-fold following a single dose of BOSULIF 500 mg with food when administered concomitantly with 125 mg aprepitant (a moderate CYP3A inhibitor).
Strong CYP3A Inducers: Bosutinib Cmax decreased by 86% and AUC decreased by 94% following a single dose of BOSULIF 500 mg with food administered concomitantly with multiple daily doses of 600 mg of rifampin (a strong CYP3A inducer).
Proton Pump Inhibitors: Lansoprazole decreased bosutinib Cmax by 46% and AUC by 26% following a single oral dose of BOSULIF 400 mg without food when used concomitantly with lansoprazole 60 mg (proton pump inhibitor) administered over multiple daily doses. Bosutinib displays pH‑dependent aqueous solubility, in vitro [see Description (11)].
P-gp Substrates: No clinically significant differences in bosutinib pharmacokinetics were observed when used concomitantly with dabigatran etexilate mesylate (a P-glycoprotein (P-gp) substrate).
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.
A greater likelihood of response and a greater likelihood of safety events were observed with higher bosutinib exposure in clinical studies. The time course of bosutinib pharmacodynamic response has not been fully characterized.
Bosutinib pharmacokinetics were assessed following oral dosing with food in adult patients with CML and were presented as geometric mean (CV%), unless otherwise specified.
Bosutinib exhibits dose proportional increases in Cmax and AUC over the oral dose range of 200 to 800 mg (0.33 to 1.3 times the maximum approved recommended dosage of 600 mg). Bosutinib steady state Cmax was 127 ng/mL (31%), Ctrough was 68 ng/mL (39%) and AUC was 2370 ng•h/mL (34%) following multiple oral doses of BOSULIF 400 mg; Bosutinib steady state Cmax was 171 ng/mL (38%), Ctrough was 91 ng/mL (42%) and AUC was 3150 ng•h/mL (38%) following multiple oral doses of BOSULIF 500 mg. No clinically significant differences in the pharmacokinetics of bosutinib were observed following administration of either the tablet or capsule dosage forms of BOSULIF at the same dose, under fed conditions.
Absorption
The median bosutinib (minimum, maximum) time-‑to-Cmax (tmax) was 6.0 (6.0, 6.0) hours following oral administration of a single oral dose of BOSULIF 500 mg with food. The absolute bioavailability was 34% in healthy subjects.
Effect of Food
Bosutinib Cmax increased 1.8-fold and AUC increased 1.7-fold when BOSULIF tablets were given with a high fat meal to healthy subjects compared to administration under fasted condition. Bosutinib Cmax increased 1.6‑fold and AUC increased 1.5-fold when BOSULIF capsules were given with a high fat meal to healthy subjects compared to administration under fasted condition. The high-fat meal (800-1000 total calories) consisted of approximately 150 protein calories, 250 carbohydrate calories, and 500-600 fat calories.
No clinically significant differences in the pharmacokinetics of bosutinib were observed following administration of a BOSULIF capsule that was opened and the contents mixed with applesauce or yogurt immediately before use.
Distribution
The mean (SD) apparent bosutinib volume of distribution is 6080 (1230) L after an oral dose of 500 mg of BOSULIF.
Bosutinib protein binding is 94% in vitro and 96% ex vivo, and is independent of concentration.
Elimination
The mean (SD) bosutinib terminal phase elimination half life (t½) was 22.5 (1.7) hours, and the mean (SD) apparent clearance was 189 (48) L/h following a single oral dose of BOSULIF.
Specific Populations
Patients with Renal Impairment
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) following a single oral dose of BOSULIF 200 mg (0.33 times the maximum approved recommended dosage of 600 mg). 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). BOSULIF has not been studied in patients undergoing hemodialysis.
Patients with Hepatic Impairment
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, following a single oral dose of BOSULIF 200 mg (0.33 times the maximum approved recommended dosage of 600 mg).
Pediatric Patients
The pharmacokinetics of bosutinib in 27 pediatric patients aged 4 to less than 17 years with newly diagnosed CP Ph+ CML or resistant/intolerant CP Ph+ CML were evaluated over the dose range of 300 mg/m2 to 400 mg/m2 administered orally once daily with food. Exposures increased in a dose proportional manner over the dose range of 300 mg/m2 to 400 mg/m2. The bosutinib median (min, max) tmax is approximately 3 hours post-dose (1, 8 hours). In 15 pediatric patients aged 4 to less than 17 years who received 300 mg/m2 daily, steady state Cmax was 159 ng/mL (42%), Ctrough was 49 ng/mL (53%) and AUC was 2027 ng•h/mL (47%). In 6 pediatric patients aged 6 to less than 17 years who received 400 mg/m2 daily, steady state Cmax was 198 ng/mL (37%), Ctrough was 42 ng/mL (105%), and AUC was 2514 ng•h/mL (35%).
An increase in BSA correlated with an increase in apparent clearance and exposure metrics did not significantly differ across BSA or age in pediatric patients following the approved recommended BSA-based dosage.
Drug Interaction Studies
Strong CYP3A Inhibitors:
Bosutinib Cmax increased 5.2-fold and AUC increased 8.6-foldfollowing a single dose of BOSULIF 100 mg (0.17 times the maximum approved recommended dosage) without food when used concomitantly with 400 mg ketoconazole (a strong CYP3A inhibitor) administered over multiple daily doses.
Moderate CYP3A Inhibitors: Bosutinib Cmax increased 1.5-fold and AUC increased 2.0-fold following a single dose of BOSULIF 500 mg with food when administered concomitantly with 125 mg aprepitant (a moderate CYP3A inhibitor).
Strong CYP3A Inducers: Bosutinib Cmax decreased by 86% and AUC decreased by 94% following a single dose of BOSULIF 500 mg with food administered concomitantly with multiple daily doses of 600 mg of rifampin (a strong CYP3A inducer).
Proton Pump Inhibitors: Lansoprazole decreased bosutinib Cmax by 46% and AUC by 26% following a single oral dose of BOSULIF 400 mg without food when used concomitantly with lansoprazole 60 mg (proton pump inhibitor) administered over multiple daily doses. Bosutinib displays pH‑dependent aqueous solubility, in vitro [see Description (11)].
P-gp Substrates: No clinically significant differences in bosutinib pharmacokinetics were observed when used concomitantly with dabigatran etexilate mesylate (a P-glycoprotein (P-gp) substrate).
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