Adverse Reactions in Adult 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 (14.2)]. 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 10 for Grade 3/4 laboratory abnormalities.
Table 9 identifies adverse reactions greater than or equal to 10% for All Grades and Grades 3 or 4 for the Phase 1/2 CML safety population based on long-term follow-up.
Table 9: Adverse Reactions (10% or Greater) in Patients With CML Who Were Resistant or Intolerant to Prior Therapy in Single-Arm Trial
| | CP CML (N=403) | AdvP CML (N=143) |
|---|
| System Organ Class | Preferred Term | All Grades % | Grade 3/4 % | All Grades % | Grade 3/4 % |
|---|
| ADR Definition |
Gastrointestinal disorders | Diarrhea | 85 | 10 | 76 | 4 |
| Abdominal pain
| 49 | 2 | 36 | 7 |
| Nausea | 47 | 1 | 48 | 2 |
| Vomiting | 38 | 3 | 43 | 3 |
| Constipation | 15 | <1 | 17 | 1 |
Skin and subcutaneous tissue disorders | Rash
| 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 |
| Edema
| 19 | <1 | 17 | 1 |
| Chest pain
| 8 | 1 | 12 | 1 |
Hepatobiliary disorders | Hepatic dysfunction
| 29 | 11 | 21 | 10 |
Infections and infestations | Respiratory tract infection
| 27 | <1 | 17 | 0 |
| Influenza
| 11 | 1 | 3 | 0 |
| Pneumonia
| 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 | Hypertension
| 11 | 3 | 8 | 3 |
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 10 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 10: 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 |
|---|
| 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. |
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 |
Pediatric Patients with Newly-Diagnosed CP Ph+ CML or CP Ph+ CML that is Resistant or Intolerant to Prior Therapy
The safety of BOSULIF was evaluated in BCHILD, a single-arm trial for the treatment of pediatric patients aged 1 year and older with newly-diagnosed CP Ph+ CML or in patients with CP Ph+ CML who are resistant or intolerant to prior therapy [see Clinical Studies (14.3)]. Patients received BOSULIF (n = 49) 300 mg/m2 to 400 mg/m2 orally once daily until disease progression or unacceptable toxicity. The median time on treatment with BOSULIF was 12.2 months (range, 0.2 to 60.9 months). Among patients who received BOSULIF, 77.6% were exposed for 6 months or longer and 51% were exposed for one year or longer.
Permanent discontinuation of BOSULIF due to an adverse reaction occurred in 20% of patients. Adverse reactions which resulted in permanent discontinuation in 2 or more patients included ALT increased (6%), AST increased (4%), diarrhea (4%), fatigue (4%) and rash maculo-papular (4%).
The most common adverse reactions, in ≥20% of BOSULIF-treated pediatric patients were diarrhea, abdominal pain, vomiting, nausea, rash, fatigue, hepatic dysfunction, headache, pyrexia, decreased appetite, and constipation.
Table 11 summarizes the adverse reactions in BCHILD.
Table 11: Adverse Reactions (10% or Greater) in Pediatric Patients with Newly Diagnosed CP Ph+ CML or CP Ph+ CML Resistant or Intolerant to Prior Therapy Who Received BOSULIF in BCHILD | Adverse drug reactions are based on all-causality treatment-emergent adverse reactions. |
| The commonality stratification is based on 'All Grades' under Bosutinib 400 mg column. |
| 'Grade 3/4 columns indicate maximum toxicity. |
System Organ Class | Preferred Term | BOSULIF Total (N=49) % |
All Grades | Grade 3/4 |
Gastrointestinal disorders | Diarrhea | 82 | 12 |
| Abdominal pain
| 73 | 4 |
| Vomiting | 55 | 6 |
| Nausea | 49 | 2 |
| Constipation | 20 | 0 |
Skin and subcutaneous tissue disorders | Rash
| 49 | 8 |
Hepatobiliary disorders | Hepatic dysfunction
| 37 | 14 |
General disorders and administration-site conditions | Fatigue
| 37 | 4 |
| Pyrexia | 31 | 4 |
Nervous system disorders | Headache | 35 | 2 |
Metabolism and nutrition disorders | Decreased appetite | 27 | 2 |
Infections and infestations | Respiratory tract infection
| 12 | 2 |
The most common laboratory abnormalities that worsened from baseline in ≥20% of patients were creatinine increased, alanine aminotransferase increased, white blood cell count decreased, aspartate aminotransferase increased, platelet count decreased, glucose increased, calcium decreased, hemoglobin decreased, neutrophil count decreased, lymphocyte count decreased, serum amylase increased and CPK increased.
Table 12 summarizes laboratory test abnormalities in BCHILD.
Table 12: Laboratory Abnormalities (≥ 20%) That Worsened From Baseline in Pediatric Patients with Newly-Diagnosed CP Ph+ CML or CP Ph+ CML Resistant or Intolerant to Prior Therapy Who Received BOSULIF in BCHILD| Grades are defined using CTCAE V4.03. Based on CTCAE grading without regard to fasting status for 'Hyperglycemia' lab parameter. |
| Includes data up to 28 days after last dose of study treatment. |
| BOSULIF (N= 49) |
All Grade | Grade 3/4 |
% | % |
Creatinine increased | 92 | 0 |
Alanine aminotransferase increased | 59 | 14 |
White blood cell count decreased | 53 | 4 |
Aspartate aminotransferase increased | 51 | 6 |
Platelet count decreased | 49 | 18 |
Glucose increased | 41 | 0 |
Calcium decreased | 31 | 0 |
Hemoglobin decreased | 31 | 8 |
Neutrophil count decreased | 31 | 12 |
Lymphocyte count decreased | 29 | 2 |
Serum amylase increased | 27 | 4 |
CPK increased | 25 | 0 |