Relapsed Refractory Multiple Myeloma (RRMM)
The safety of PEPAXTO was evaluated in HORIZON [see Clinical Studies (14)]. Patients received PEPAXTO 40 mg intravenously on Day 1 of each 28-day cycle, in combination with dexamethasone 40 mg orally (or 20 mg for patients 75 years and older) on Days 1, 8, 15 and 22 of each cycle (N=157). Patients were enrolled if they had absolute neutrophil count of 1 × 109/L or higher and platelet count of 75 × 109/L or greater. Among patients who received PEPAXTO, 29% were exposed for 6 months or longer and 6% were exposed for greater than one year.
Serious adverse reactions occurred in 49% of patients who received PEPAXTO. Serious adverse reactions in >3% of patients included pneumonia (10%), respiratory tract infection (6%), thrombocytopenia (5%), febrile neutropenia (5%) and sepsis (3.2%). Fatal adverse reactions occurred in 10 patients (6%) who received PEPAXTO, where general physical health deterioration (1.9%) and respiratory failure (1.3%) represented more than 1%.
Permanent discontinuation of PEPAXTO due to an adverse reaction occurred in 22% of patients. Adverse reactions which resulted in permanent discontinuation of PEPAXTO in >3% of patients included thrombocytopenia (11%).
Dosage interruptions of PEPAXTO due to an adverse reaction occurred in 62% of patients. The adverse reactions which resulted in dosage interruption of PEPAXTO in >3% of patients included thrombocytopenia (43%), neutropenia (29%), anemia (10%), respiratory tract infection (7%), leukopenia (6%) and pyrexia (4.5%).
Dose reductions of PEPAXTO due to an adverse reaction occurred in 27% of patients. Adverse reactions which resulted in dose reductions of PEPAXTO in >3% patients included thrombocytopenia (22%) and neutropenia (6%).
The most common adverse reactions (≥20%) were fatigue, nausea, diarrhea, pyrexia and respiratory tract infection. The most common laboratory abnormalities (≥50%) were leukocytes decreased, platelets decreased, lymphocytes decreased, neutrophils decreased, hemoglobin decreased and creatinine increased.
Table 3 summarizes the adverse reactions in HORIZON.
Table 3: Adverse reactions (≥10%) in Patients with RRMM Who Received PEPAXTO with Dexamethasone in HORIZON| Adverse Reaction | PEPAXTO with Dexamethasone (N=157) |
|---|
All Grades (%) | Grade 3 or 4 (%) |
|---|
| General disorders and administration site disorders | | |
| Fatigue
| 55 | 6 |
| Pyrexia
| 24 | 1.9 |
| Edema peripheral
| 14 | 1.3 |
| Gastrointestinal disorders | | |
| Nausea
| 32 | 0.6 |
| Diarrhea | 27 | 0 |
| Constipation
| 15 | 0.6 |
| Vomiting | 13 | 0 |
| Infections | | |
| Respiratory tract infection
,
| 24 | 5 |
| Pneumonia
| 13 | 11 |
| Respiratory, thoracic and mediastinal disorders | | |
| Cough
| 17 | 0 |
| Dyspnea
| 11 | 1.3 |
| Dyspnea exertional | 10 | 0 |
| Metabolism and nutrition disorders | | |
| Decreased appetite
| 14 | 0.6 |
| Hypokalemia
| 14 | 1.3 |
| Hypocalcemia
| 10 | 0.6 |
| Nervous system disorders | | |
| Headache | 13 | 0 |
| Dizziness | 11 | 0 |
| Musculoskeletal and connective tissue disorders | | |
| Bone pain
| 13 | 1.9 |
| Pain in extremity
| 13 | 1.9 |
| Back pain
| 12 | 0.6 |
| Arthralgia | 10 | 0 |
| Psychiatric disorders | | |
| Insomnia
| 11 | 0.6 |
Clinically relevant adverse reactions in <10% of patients who received PEPAXTO in combination with dexamethasone (N=157) included:
Allergic conditions: hypersensitivity reaction (7%)
Blood and lymphatic system disorders: febrile neutropenia (6%)
Infections: sepsis (3.8%)
Hemorrhages: Grade 3 or 4 hemorrhages (3.8%)
Table 4 summarizes the laboratory abnormalities in HORIZON.
Table 4: Laboratory Abnormalities (≥50%) That Worsened from Baseline in Patients in HORIZON| Laboratory Abnormality | PEPAXTO with Dexamethasone
|
|---|
All Grades
(%) | Grade 3- 4
(%) |
|---|
| Leukocytes decrease | 99 | 88 |
| Platelets decrease | 99 | 80 |
| Lymphocytes decrease | 97 | 95 |
| Neutrophils decrease | 95 | 82 |
| Hemoglobin decrease | 84 | 50 |
| Creatinine increase | 68 | 1
|