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.
Unless noted, data in WARNINGS AND PRECAUTIONS and below reflects exposure to VITRAKVI in 444 patients, including 62% patients exposed for greater than 6 months, 44% patients exposed for greater than 1 year, and 30% patients exposed for greater than 2 years. VITRAKVI was studied in one adult dose-finding trial [LOXO-TRK-14001 (n = 75)], one pediatric dose-finding trial [SCOUT (n = 154)], and one single arm trial [NAVIGATE (n = 215)]. All patients had an unresectable or metastatic solid tumor and no satisfactory alternative treatment options or disease progression following treatment.
Across these 444 patients, the median age was 44 years (range: 18 days to 90 years); 35% were younger than 18 years; 53% were female; 59% were White, 24% were Asian and, 4% were Black; and 7% were Hispanic/Latino. Most adults (91%) received VITRAKVI 100 mg orally twice daily and 91% of pediatrics (< 18 years) received VITRAKVI 100 mg/m2 twice daily up to a maximum dose of 100 mg twice daily. The dose ranged from 50 mg daily to 200 mg twice daily in adults and 9.6 mg/m2 twice daily to 120 mg/m2 twice daily in pediatrics [see Use in Specific Populations (8.4)].
The most common serious adverse reactions (≥ 2%) were pneumonia, pyrexia, and dyspnea. Grade 3 or 4 adverse reactions occurred in 60% of patients; adverse reactions leading to dose interruption or modification occurred in 45% and 11% of patients, respectively, and 12% permanently discontinued VITRAKVI for adverse reactions.
The most common adverse reactions (1% each) that resulted in permanent discontinuation of VITRAKVI were increased ALT and increased AST.
The most common adverse reactions (≥ 3%) resulting in dose interruption were increased ALT (6%), increased AST (5%), neutrophil count decreased (4.7%), pyrexia (4.3%), and vomiting (3.2%). Most (64%) adverse reactions leading to dose interruption occurred during the first three months of exposure.
The most common adverse reactions (≥ 20%), including laboratory abnormalities, in order of decreasing frequency were increased AST, increased ALT, anemia, hypoalbuminemia, musculoskeletal pain, increased alkaline phosphatase, leukopenia, lymphopenia, neutropenia, hypocalcemia, fatigue, vomiting, cough, constipation, pyrexia, diarrhea, nausea, abdominal pain, dizziness, and rash.
Adverse reactions of VITRAKVI occurring in ≥ 10% of patients and laboratory abnormalities worsening from baseline in ≥ 20% of patients are summarized in Table 3 and Table 4, respectively.
Table 3 Adverse Reactions Occurring in ≥ 10% of Patients Treated with VITRAKVI| Adverse Reaction
| VITRAKVI N = 444 |
|---|
All Grades
(%) | Grade 3-4
(%) |
|---|
| Musculoskeletal and Connective Tissue | | |
| Musculoskeletal Pain
| 41 | 3.6 |
| General | | |
| Fatigue
| 31 | 2.5 |
| Pyrexia | 26 | 2.3 |
| Edema
| 17 | 0.7 |
| Respiratory, Thoracic and Mediastinal | | |
| Cough
| 29 | 0.5 |
| Dyspnea
| 17 | 2.7 |
| Nasal congestion | 10 | 0 |
| Nervous System | | |
| Dizziness
| 22 | 0.9 |
| Headache | 17 | 0.9 |
| Cognitive Impairment
| 11 | 2 |
| Gastrointestinal | | |
| Vomiting | 30 | 1.1 |
| Constipation | 27 | 0.5 |
| Diarrhea | 26 | 2.9 |
| Nausea | 25 | 0.5 |
| Abdominal pain
| 24 | 1.4 |
| Skin and Subcutaneous Tissue Disorders | | |
| Rash
| 21 | 0.2 |
| Psychiatric | | |
| Mood disorders
| 14 | 0.9 |
| Sleep Disturbance
| 12 | 0.2 |
| Investigations | | |
| Increased weight | 17 | 4.1 |
| Metabolism and Nutrition | | |
| Decreased appetite | 14 | 1.1 |
| Infections and Infestations | | |
| Upper respiratory tract infection | 18 | 0.7 |
| Urinary tract infection
| 14 | 1.8 |
| Nasopharyngitis | 11 | 0 |
Clinically relevant adverse reactions occurring in ≤ 10% of patients include fractures (7%).
Table 4 Laboratory Abnormalities Occurring in ≥ 20% Patients Treated with VITRAKVI| Laboratory Abnormality | VITRAKVI
|
|---|
| All Grades (%)
| Grade 3-4 (%)
|
|---|
| Chemistry | | |
| Increased AST | 62 | 7 |
| Increased ALT | 61 | 8 |
| Hypoalbuminemia | 44 | 2.7 |
| Increased alkaline phosphatase | 40 | 3 |
| Hypocalcemia | 32 | 3.1 |
| Hematology | | |
| Anemia | 45 | 8 |
| Leukopenia | 37 | 3.8 |
| Lymphopenia | 35 | 11 |
| Neutropenia | 34 | 11 |