Unituxin

1 INDICATIONS AND USAGE Unituxin (dinutuximab) is indicated, in combination with granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin-2 (IL-2), and 13-cis-retinoic acid (RA), for the treatment of pediatric patients with high-risk neuroblastoma who achieve at least a partial response to prior first-line multiagent, multimodality therapy [see Clinical Studies (14) ] . Unituxin is a GD2-binding monoclonal antibody indicated, in combination with granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin-2 (IL-2), and 13-cis-retinoic acid (RA), for the treatment of pediatric patients with high-risk neuroblastoma who achieve at least a partial response to prior first-line multiagent, multimodality therapy. ( 1 )

2 DOSAGE AND ADMINISTRATION Verify that patients have adequate hematologic, respiratory, hepatic, and renal function prior to initiating each course of Unituxin [see Clinical Studies (14) ] . Administer required premedication and hydration prior to initiation of each Unituxin infusion [see Dosage and Administration (2.2) ] . 17.5 mg/m 2 /day as a diluted intravenous infusion over 10 to 20 hours for 4 consecutive days for up to 5 cycles. ( 2.1 , 2.4 ) 2.1 Recommended Dose The recommended dose of Unituxin is 17.5 mg/m 2 /day administered as an intravenous infusion over 10 to 20 hours for 4 consecutive days for a maximum of 5 cycles (Table 1 and Table 2) [see Dosage and Administration (2.4) and Clinical Studies (14) ] . Initiate at an infusion rate of 0.875 mg/m 2 /hour for 30 minutes. The infusion rate can be gradually increased as tolerated to a maximum rate of 1.75 mg/m 2 /hour. Follow dose modification instructions for adverse reactions [see Dosage and Administration (2.3) ] . Table 1: Schedule of Unituxin Administration for Cycles 1, 3, and 5 Cycle Day 1 through 3 4 5 6 7 8 through 24 Cycles 1, 3, and 5 are 24 days in duration. Unituxin X X X X Table 2: Schedule of Unituxin Administration for Cycles 2 and 4 Cycle Day 1 through 7 8 9 10 11 12 through 32 Cycles 2 and 4 are 32 days in duration. Unituxin X X X X 2.2 Required Pre-treatment Guidelines Intravenous Hydration Administer 0.9% Sodium Chloride Injection, USP 10 mL/kg as an intravenous infusion over 1 hour just prior to initiating each Unituxin infusion. Analgesics Administer morphine sulfate (50 mcg/kg) intravenously immediately prior to initiation of Unituxin and then continue as a morphine sulfate drip at an infusion rate of 20 to 50 mcg/kg/hour during and for 2 hours following completion of Unituxin. Administer additional 25 mcg/kg to 50 mcg/kg intravenous doses of morphine sulfate as needed for pain up to once every 2 hours followed by an increase in the morphine sulfate infusion rate in clinically stable patients. Consider using fentanyl or hydromorphone if morphine sulfate is not tolerated. If pain is inadequately managed with opioids, consider use of gabapentin or lidocaine in conjunction with intravenous morphine. Antihistamines and Antipyretics Administer an antihistamine such as diphenhydramine (0.5 to 1 mg/kg; maximum dose 50 mg) intravenously over 10 to 15 minutes starting 20 minutes prior to initiation of Unituxin and as tolerated every 4 to 6 hours during the Unituxin infusion. Administer acetaminophen (10 to 15 mg/kg; maximum dose 650 mg) 20 minutes prior to each Unituxin infusion and every 4 to 6 hours as needed for fever or pain. Administer ibuprofen (5 to 10 mg/kg) every 6 hours as needed for control of persistent fever or pain. 2.3 Dosage Modifications Manage adverse reactions by infusion interruption, infusion rate reduction, dose reduction, or permanent discontinuation of Unituxin (Table 3 and Table 4) [see Warnings and Precautions (5) , Adverse Reactions (6) , and Clinical Studies (14) ] . Table 3: Adverse Reactions Requiring Permanent Discontinuation of Unituxin Grade 3 or 4 anaphylaxis Grade 3 or 4 serum sickness Grade 3 pain unresponsive to maximum supportive measures Grade 4 sensory neuropathy or Grade 3 sensory neuropathy that interferes with daily activities for more than 2 weeks Grade 2 or greater peripheral motor neuropathy Urinary retention that persists following discontinuation of opioids Transverse myelitis Reversible posterior leukoencephalopathy syndrome (RPLS) Subtotal or total vision loss Grade 4 hyponatremia despite appropriate fluid management Atypical hemolytic uremic syndrome Table 4: Dose Modification for Selected Unituxin Adverse Reactions Infusion-related reactions [see Warnings and Precautions (5.1) ] Mild to moderate adverse reactions, such as transient rash, fever, rigors, and localized urticaria, that respond promptly to symptomatic treatment Onset of reaction: Reduce Unituxin infusion rate to 50% of the previous rate and…

5 WARNINGS AND PRECAUTIONS Neurological Disorders of the Eye: Interrupt Unituxin for dilated pupil with sluggish light reflex or other visual disturbances and permanently discontinue Unituxin for recurrent eye disorders or loss of vision. ( 5.2 ) Prolonged Urinary Retention and Transverse Myelitis: Permanently discontinue Unituxin and institute supportive care. ( 5.2 ) Reversible Posterior Leukoencephalopathy Syndrome (RPLS): Permanently discontinue Unituxin and institute supportive care for signs and symptoms of RPLS. ( 5.2 ) Capillary Leak Syndrome and Hypotension: Administer required prehydration and monitor patients closely during treatment. Depending upon severity, manage by interruption, infusion rate reduction, or permanent discontinuation. ( 5.3 , 5.4 ) Infection: Interrupt until resolution of systemic infection. ( 5.5 ) Bone Marrow Suppression: Monitor peripheral blood counts during Unituxin therapy. ( 5.6 ) Electrolyte Abnormalities: Monitor serum electrolytes closely. ( 5.7 ) Atypical Hemolytic Uremic Syndrome: Permanently discontinue Unituxin and institute supportive management. ( 5.8 ) Embryo-Fetal Toxicity: May cause fetal harm. Advise females of reproductive potential of potential risk to a fetus and to use effective contraception. ( 5.9 , 8.1 , 8.3 ) 5.1 Serious Infusion Reactions Serious infusion reactions requiring urgent intervention, including blood pressure support, bronchodilator therapy, corticosteroids, infusion rate reduction, infusion interruption, or permanent discontinuation of Unituxin, included facial and upper airway edema, dyspnea, bronchospasm, stridor, urticaria, and hypotension. Infusion reactions generally occurred during or within 24 hours of completing the Unituxin infusion. Due to overlapping signs and symptoms, it was not possible to distinguish between infusion reactions and hypersensitivity reactions in some cases. In Study 1, Severe (Grade 3 or 4) infusion reactions occurred in 35 (26%) patients in the Unituxin/13-cis-retinoic acid (RA) group compared to 1 (1%) patient receiving RA alone. Severe urticaria occurred in 17 (13%) patients in the Unituxin/RA group but did not occur in the RA group. Serious adverse reactions consistent with anaphylaxis and resulting in permanent discontinuation of Unituxin occurred in 2 (1%) patients in the Unituxin/RA group. Additionally, 1 (0.1%) patient had multiple cardiac arrests and died within 24 hours after having received Unituxin in Study 2. Prior to each Unituxin dose, administer required intravenous hydration and premedication with antihistamines, analgesics, and antipyretics [see Dosage and Administration (2.2) ] . Monitor patients closely for signs and symptoms of infusion reactions during and for at least 4 hours following completion of each Unituxin infusion in a setting where cardiopulmonary resuscitation medication and equipment are available. For mild to moderate infusion reactions, such as transient rash, fever, rigors, and localized urticaria, that respond promptly to antihistamines or antipyretics, decrease the Unituxin infusion rate and monitor closely. Immediately interrupt or permanently discontinue Unituxin and institute supportive management for severe or prolonged infusion reactions. Permanently discontinue Unituxin and institute supportive management for life-threatening infusion reactions [see Dosage and Administration (2.3) ] . 5.2 Neurotoxicity Pain In Study 1, 114 (85%) patients treated in the Unituxin/RA group experienced pain despite pre-treatment with analgesics, including morphine sulfate infusion. Severe (Grade 3) pain occurred in 68 (51%) patients in the Unituxin/RA group compared to 5 (5%) patients in the RA group. Pain typically occurred during the Unituxin infusion and was most commonly reported as abdominal pain, generalized pain, extremity pain, back pain, neuralgia, musculoskeletal chest pain, and arthralgia. Premedicate with analgesics, including intravenous opioids, prior to each dose of Unituxin and continue a…

4 CONTRAINDICATIONS Unituxin is contraindicated in patients with a history of anaphylaxis to dinutuximab. History of anaphylaxis to dinutuximab. ( 4 )

7 DRUG INTERACTIONS No drug-drug interaction studies have been conducted with dinutuximab.

8.1 Pregnancy Risk Summary Based on its mechanism of action, Unituxin may cause fetal harm when administered to a pregnant woman [see Clinical Pharmacology (12.1) ] . There are no studies in pregnant women and no reproductive studies in animals to inform the drug-associated risk. Monoclonal antibodies are transported across the placenta in a linear fashion as pregnancy progresses, with the largest amount transferred during the third trimester. 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. However, the background risk in the U.S. general population of major birth defects is 2 to 4% and of miscarriage is 15 to 20% of clinically recognized pregnancies.

6 ADVERSE REACTIONS The following adverse reactions are discussed in greater detail in other sections of the labeling: Serious Infusion Reactions [see Boxed Warning and Warnings and Precautions (5.1) ] Neurotoxicity, including Pain, Peripheral Neuropathy, Neurological Disorders of the Eye, Prolonged Urinary Retention, Transverse Myelitis, and Reversible Posterior Leukoencephalopathy Syndrome [see Boxed Warning and Warnings and Precautions (5.2) ] Capillary Leak Syndrome [see Warnings and Precautions (5.3) ] Hypotension [see Warnings and Precautions (5.4) ] Infection [see Warnings and Precautions (5.5) ] Bone Marrow Suppression [see Warnings and Precautions (5.6) ] Electrolyte Abnormalities [see Warnings and Precautions (5.7) ] Atypical Hemolytic Uremic Syndrome [see Warnings and Precautions (5.8) ] Embryo-Fetal Toxicity [see Warnings and Precautions (5.9) ] The most common adverse drug reactions (≥25%) are pain, pyrexia, thrombocytopenia, lymphopenia, infusion reactions, hypotension, hyponatremia, increased alanine aminotransferase, anemia, vomiting, diarrhea, hypokalemia, capillary leak syndrome, neutropenia, urticaria, hypoalbuminemia, increased aspartate aminotransferase, and hypocalcemia. ( 5 , 6.1 ) The most common serious adverse reactions (≥5%) are infections, infusion reactions, hypokalemia, hypotension, pain, fever, and capillary leak syndrome. ( 5 , 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact United Therapeutics Corp. at 1-866-458-6479 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch. 6.1 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 rates observed in clinical practice. The data described below reflect exposure to Unituxin at the recommended dose and schedule in 1021 patients with high-risk neuroblastoma enrolled in an open-label, randomized (Study 1), or single-arm clinical trials (Study 2 and Study 3). Prior to enrollment, patients received therapy consisting of induction combination chemotherapy, maximum feasible surgical resection, myeloablative consolidation chemotherapy followed by autologous stem cell transplant, and radiation therapy to residual soft tissue disease. Patients received Unituxin in combination with granulocyte-macrophage colony-stimulating factor (GM-CSF), interleukin-2 (IL-2), and 13-cis-retinoic acid (RA). Treatment commenced within 95 days post autologous stem cell transplant in Study 1, within 210 days of autologous stem cell transplant in Study 2, and within 110 days of autologous stem cell transplant in Study 3. Study 1 In a randomized, open-label, multicenter study (Study 1), 134 patients received Unituxin in combination with GM-CSF, IL-2, and RA (Unituxin/RA group), including 109 randomized patients and 25 patients with biopsy-proven residual disease who were non-randomly assigned to receive Unituxin. A total of 106 randomized patients received RA alone (RA group) [see Dosage and Administration (2) and Clinical Studies (14) ] . Patients had a median age at enrollment of 3.8 years (range: 0.94 to 15.3 years), and were predominantly male (60%) and White (82%). In Study 1, adverse reactions of Grade 3 or greater severity were comprehensively collected, but adverse reactions of Grade 1 or 2 severity were collected sporadically and laboratory data were not comprehensively collected. Approximately 71% of patients in the Unituxin/RA group and 77% of patients in the RA group completed planned treatment. The most common reason for premature discontinuation of study therapy was adverse reactions in the Unituxin/RA group (19%) and progressive disease (17%) in the RA group. The most common adverse drug reactions (≥25%) in the Unituxin/RA group were pain, pyrexia, thrombocytopenia, lymphopenia, infusion reactions, hypotension, hyponatremia, increased alanine aminotransferase, anemia…