PROLEUKIN

Aldesleukin is a human interleukin-2 lymphocyte growth factor produced by recombinant DNA technology using a genetically engineered E. coli strain containing an analog of the human interleukin-2 gene. It is a purified protein with a molecular weight of approximately 15,300 Da. This recombinant form differs from native interleukin-2 in the following ways: a) aldesleukin is not glycosylated; b) the molecule has no N-terminal alanine; c) the molecule has serine substituted for cysteine at amino acid position 125. Proleukin exists as biologically active, non-covalently bound microaggregates with an average size of 27 recombinant interleukin-2 molecules; the aggregation state of aldesleukin may differ compared to native interleukin-2. The manufacturing process for aldesleukin involves fermentation in a defined medium containing tetracycline hydrochloride. The presence of tetracycline hydrochloride is not detectable in the final product. Proleukin (aldesleukin) for injection is a sterile, preservative-free white to off-white, lyophilized powder, which has a cake-like appearance, supplied in single-dose vials for intravenous administration after reconstitution and dilution. When reconstituted with 1.2 mL Sterile Water for Injection, USP, each mL contains 18 million International Units (1.1 mg) aldesleukin, mannitol (50 mg), sodium dodecyl sulfate (0.19 mg), buffered with disodium hydrogen phosphate dihydrate (1.12 mg) and sodium dihydrogen phosphate dihydrate (0.19 mg) to a pH of 7.5 (range 7.2 to 7.8).

Proleukin is a lymphocyte growth factor indicated for: The treatment of adults with metastatic renal cell carcinoma. ( 1.1 ) The treatment of adults with metastatic melanoma. ( 1.2 ) 1.1 Metastatic Renal Cell Carcinoma Proleukin is indicated for the treatment of adults with metastatic renal cell carcinoma (RCC). 1.2 Metastatic Melanoma Proleukin is indicated for the treatment of adults with metastatic melanoma.

Administer Proleukin in an inpatient hospital setting with an intensive care facility. Evaluate cardiovascular, pulmonary, neurologic and renal function before beginning Proleukin. ( 2.1 ) See Full Prescribing Information for Premedication and Supportive medications. ( 2.3 ) Recommended dosage: 600,000 IU/kg (0.037 mg/kg) every 8 hours by a 15-minute intravenous infusion for a maximum of 14 doses. Following 9 days of rest, repeat the schedule for a maximum of another 14 doses (total of 28 doses per course, as tolerated). ( 2.2 ) Evaluate patients approximately 4 weeks after completion of a course of therapy and again immediately prior to the start of the next course. ( 2.2 ) Dose modification for toxicity should be accomplished by withholding or interrupting a dose. ( 2.4 ) Follow reconstitution and dilution procedures. ( 2.5 ) 2.1 Recommended Evaluation and Testing Before Initiating Proleukin Conduct baseline hematologic, chemistry, renal and hepatic function tests. Additionally, evaluate cardiac ejection fraction, coronary artery disease as appropriate, pulmonary function with PFTs, and evaluate for renal, hepatic, and CNS impairment prior to initiating treatment with Proleukin [see Contraindications (4) , Warnings and Precautions (5.1 , 5.2) ]. Verify pregnancy status of females of reproductive potential prior to initiating Proleukin [see Warnings and Precautions (5.6) , Use in Specific Populations (8.1 , 8.3) ]. 2.2 Recommended Dosage Administer Proleukin in an inpatient hospital setting. An intensive care facility with specialists skilled in cardiopulmonary or intensive care medicine must be available [see Warnings and Precautions (5.1) ] . The recommended dosage of Proleukin for metastatic renal cell carcinoma and metastatic melanoma is described in Table 1. Administer Proleukin as an intravenous infusion after dilution [see Dosage and Administration (2.5) ] . Administer pre-infusion medications and supportive treatment, as appropriate, prior to and during each infusion [see Dosage and Administration (2.3) ]. Discontinue Proleukin for unacceptable toxicity [see Dosage and Administration (2.4) ]. Table 1: Recommended Dosage of Proleukin Each course of therapy consists of the following: Cycle 1 Days 1-5 600,000 IU/kg (0.037 mg/kg) every 8 hours; maximum of 14 doses A maximum of 28 doses (2 cycles) per treatment course Rest period Days 6-14 Cycle 2 Days 15-19 600,000 IU/kg (0.037 mg/kg) every 8 hours; maximum of 14 doses Evaluate patients for response approximately 4 weeks after completion of a course of therapy and again immediately prior to the scheduled start of the next treatment course. Additional courses of treatment may be administered to patients if there is a treatment response following the last course, and the patient did not experience any adverse reactions in previous course(s) that led to permanent discontinuation [see Dosage and Administration (2.4) ]. Separate each treatment course by a rest period of at least 7 weeks from the date of hospital discharge. 2.3 Premedication and Supportive Medications Premedicate patients with an antipyretic immediately prior to beginning Proleukin. Continue antipyretics during treatment as needed for fever [see Warnings and Precautions (5.1 , 5.10) ]. Administer prophylactic antibiotics per institutional guidelines prior to beginning Proleukin and throughout the treatment course for patients with indwelling central catheters [see Warnings and Precautions (5.3) ]. Administer prophylactic medication for gastrointestinal irritation and bleeding during each Proleukin treatment course [see Adverse Reactions (6.1) ]. Additional medications may be needed if patients experience hypotension, dyspnea, rigors, nausea, diarrhea, pruritis, or dermatitis [see Warnings and Precautions (5.1 , 5.8 , 5.9) ]. 2.4 Dosage Modifications for Adverse Reactions No dose reduction for Proleukin is recommended for adverse reactions. In general, withhold or interrupt a dose or permanently discontinue Proleukin based on the severity of the adverse reaction as described in Table 2. Table 2: Recommended Dosage Modifications for Adverse Reactions Adverse Reaction Severity Dosage Modification Cardiovascular [see Warnings and Precautions (5.1) ] Atrial fibrillation, Supraventricular tachycardia, or Bradycardia that requires treatment or is recurrent or persistent Decrease in systolic blood pressure to <90 mmHg Withhold until patient is asymptomatic with full recovery to normal sinus rhythm Sustained ventricular tachycardia (≥5 beats) Cardiac rhythm disturbances not controlled or unresponsive to management ECG changes consistent with ischemia or myocardial infarction or angina/chest pain Cardiac tamponade Permanently discontinue Respiratory [see Warnings and Precautions (5.1) ] O2 saturation <90% Withhold until O2 saturation is >90% Intubation for >72 hours Permanently discontinue Neurologic [see Warnings and Precautions (5.2) ] Mental status changes, including moderate confusion or agitation Withhold until completely resolved Coma or toxic psychosis lasting >48 hours Repetitive or difficult to control seizures Permanently discontinue Gastrointestinal [see Warnings and Precautions (5.1) ] Fecal immunochemical test (FIT) or fecal occult blood test (FOBT) positive Withhold until FIT or FOBT negative Bowel ischemia/perforation or GI bleeding requiring surgery Permanently discontinue Hepatic [see Warnings and Precautions (5.1) ] Signs of hepatic toxicity including liver pain or ≥ Grade 3 AST or ALT elevation Withhold all further treatment for that course. Initiate a new course of treatment no sooner than 7 weeks after signs of hepatic toxicity have resolved and hospital discharge Hepatic failure Permanently discontinue Dermatologic [see Warnings and Precautions (5.5 , 5.7) ] Bullous dermatitis or marked worsening of pre-existing skin condition Withhold until all signs of bullous dermatitis have resolved Infectious [see Warnings and Precautions (5.3) ] Sepsis syndrome, patient is clinically unstable Withhold until sepsis syndrome has resolved, patient is clinically stable, infection is under treatment Renal [see Warnings and Precautions (5.1 , 5.4) ] Serum creatinine >4.5 mg/dL or a serum creatinine of ≥4 mg/dL in the presence of severe volume overload, acidosis, or hyperkalemia Withhold until serum creatinine levels return to normal (<1.5 mg/dL) or baseline and fluid and electrolyte status are stable Persistent oliguria, urine output of <10 mL/hr for 16-24 hours with rising SCr Withhold until urine output >10 mL/hour with a decrease of serum creatinine >1.5 mg/dL or normalization of serum creatinine Renal failure requiring dialysis >72 hours Permanently discontinue 2.5 Preparation and Administration Preparation Reconstitute Proleukin using Sterile Water for Injection, USP. Do not reconstitute or dilute Proleukin with Bacteriostatic Water for Injection, or 0.9% Sodium Chloride Injection. Add 1.2 mL of Sterile Water for Injection, USP, by injecting the water along the walls of the vial and not directly on the lyophilized powder. The resulting concentration is 18 million IU (1.1 mg)/mL of Proleukin. The prepared solution is a clear, colorless to slightly yellow liquid. Slowly swirl the vial; do not shake. Withdraw the required dose of Proleukin and discard the vial with any unused portion. Use polyvinyl chloride bags for dilution of Proleukin and dilute using 5% Dextrose Injection to a concentration between 0.03 mg/mL and 0.07 mg/mL based on the required dose as follows: Table 3: Recommended Proleukin Dilution Dose 5% Dextrose Volume ≤25.4 million IU (≤1.5 mg) 25 mL >25.4 million IU-60 million IU (>1.5 mg-3.5 mg) 50 mL >60 million IU (>3.5 mg) 100 mL Storage of Diluted Proleukin Infusion Solution Store under refrigeration at 2° to 8°C (36° to 46°F) for no more than 48 hours from the time of preparation to the end of the infusion. Protect from light. Do not freeze. Allow the diluted solution to come to room temperature prior to administration. Administration Do not use in-line filters when administering Proleukin. Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit. Do not co-administer Proleukin with other drugs through the same intravenous line. Administer by intravenous infusion over 15 minutes.

Severe Hypersensitivity Reactions Proleukin is contraindicated in patients with a known history of severe hypersensitivity to aldesleukin or any component of the Proleukin formulation [see Adverse Reactions (6.2) ]. Organ Allografts Proleukin is contraindicated in patients with organ allografts [see Warnings and Precautions (5.5) ] . Significant Organ Impairment Proleukin is contraindicated in patients with significant cardiac (including those with an abnormal cardiac ejection fraction, impaired wall motion, or significant coronary artery disease), pulmonary (including those with an FEV1 ≤ 2 liters or < 75% predicted for height and age), renal, hepatic, or CNS impairment [see Warnings and Precautions (5.1 , 5.2 , 5.4) ] . Hypersensitivity to aldesleukin. ( 4 ) Organ allografts. ( 4 ) Significant organ impairment. ( 4 )

The following clinically significant adverse reactions are described elsewhere in the labeling: Capillary Leak Syndrome [see Warnings and Precautions (5.1) ]. Neurotoxicity [see Warnings and Precautions (5.2) ]. Serious Infections Including Sepsis [see Warnings and Precautions (5.3) ]. Renal Toxicity [see Warnings and Precautions (5.4) ]. Immune-Mediated Adverse Reactions [see Warnings and Precautions (5.5) ]. Serious Manifestations of Eosinophilia [see Warnings and Precautions (5.7) ]. Severe Hypersensitivity Reactions [see Warnings and Precautions (5.9) ]. Infusion-Related Reactions [see Warnings and Precautions (5.10) ] . Most common (≥ 30%) adverse reactions including laboratory abnormalities are hypotension, hyperbilirubinemia, dyspnea, rash, diarrhea, oliguria, chills, vomiting, thrombocytopenia, nausea, confusional state and increased creatinine. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Iovance Biotherapeutics Manufacturing LLC. at 1 844-845-IOVA 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 the rates observed in practice. The safety of Proleukin was evaluated in a series of single and multicenter, controlled studies enrolling a total of 525 patients with metastatic renal cell carcinoma (mRCC studies) or metastatic melanoma (metastatic melanoma studies) [see Clinical Studies (14.1 , 14.2) ] . In patients who received Proleukin in these studies, fatal adverse reactions occurred in 4% (11/255) of the patients with metastatic RCC, and 2% (6/270) of the patients with metastatic melanoma. In these studies, >90% of patients had doses withheld for adverse reactions [see Dosage and Administration (2.4) ]. The most common (≥30%) adverse reactions were hypotension, hyperbilirubinemia, dyspnea, rash, diarrhea, oliguria, chills, vomiting, thrombocytopenia, nausea, confusional state, and increased creatinine. Table 4 summarizes adverse reactions that occurred in these studies. Table 4: Adverse Reactions (≥10% all grades or ≥1% Grade 4) in Patients with Metastatic Renal Cell Carcinoma or Metastatic Melanoma (n=525) receiving Proleukin Adverse Reaction Proleukin N = 525 All Grades (%) Grade 4 (%) General disorders Chills 52 0 Pyrexia 29 1 Edema peripheral 28 0 Malaise 27 0 Asthenia 23 0 Edema 15 0 Pain 12 0 Cardiac disorders Hypotension 71 3 Blood pressure fluctuation Not documented 1 Tachycardia 23 0 Dilated veins 13 0 Supraventricular tachycardia 12 1 Ventricular tachycardia <10 1 Cardiovascular disorder Cardiovascular disorder: Electrocardiogram abnormal, cardiac failure congestive. 11 0 Myocardial infarction <10 1 Arrhythmia 10 0 Cardiac arrest <10 1 Gastrointestinal disorders Diarrhea 67 2 Vomiting 50 0 Nausea 35 0 Stomatitis 22 <1 Decreased appetite 20 0 Abdominal pain 11 0 Abdominal distention 10 0 Blood and lymphatic system disorders Thrombocytopenia 37 1 Anemia 29 0 Leukopenia 16 0 Disseminated intravascular coagulation <10 1 Infections Infections 13 1 Sepsis <10 1 Hepatobiliary disorders Hyperbilirubinemia 40 2 Aspartate aminotransferase increased 23 1 Metabolic and nutritional disorders Weight increased 16 0 Acidosis 12 1 Hypomagnesemia 12 0 Hypocalcemia 11 <1 Blood alkaline phosphatase increased 10 0 Nervous system disorders Confusional state 34 1 Stupor <10 1 Coma <10 2 Psychotic disorder <10 1 Somnolence 22 0 Anxiety 12 0 Dizziness 11 0 Respiratory, thoracic, and mediastinal disorders Dyspnea 43 1 Lung disorder Lung disorder: Pulmonary congestion, rales, rhonchi. 24 0 Respiratory disorder Respiratory disorder: Acute respiratory distress syndrome, lung infiltration, lung disorder, respiratory failure, endotracheal intubation. 11 3 Apnea <10 1 Cough 11 0 Rhinitis 10 0 Skin and subcutaneous tissue disorders Rash 42 0 Pruritis 24 0 Dermatitis exfoliative 18 0 Renal and urinary disorders Oliguria 63 6 Blood creatinine increased 33 1 Anuria <10 5 Acute kidney injury <10 1 Additional life-threatening adverse reactions (Grade 4) were reported by <1% of the 525 patients: Cardiac disorders: bradycardia, pericardial effusion, ventricular extrasystoles, myocardial ischemia, arrhythmia supraventricular, coronary artery disease, atrioventricular block second degree, endocarditis Eye disorders: mydriasis, pupillary disorder Gastrointestinal disorders: intestinal perforation, gastrointestinal hemorrhage, hematemesis, pancreatitis, diarrhea hemorrhagic General disorders and administration site conditions: hypothermia Infections and infestations: gangrene Metabolism and nutrition disorders: hyperuricemia Nervous system disorders: syncope, neuropathy peripheral, seizure, generalized tonic-clonic seizure Investigations: liver function tests abnormal, blood urea increased Psychiatric disorders: agitation, paranoia Renal and urinary disorders: renal failure, renal tubular necrosis Respiratory, thoracic and mediastinal disorders: respiratory acidosis, asthma, pulmonary edema, hyperventilation, hypoxia, hemoptysis, hypoventilation, pneumothorax Vascular disorders: shock, hemorrhage, phlebitis, thrombosis Other Clinical Trial Experience The following serious adverse reactions were reported in patients with RCC, melanoma, or other cancers treated with Proleukin-based regimens (n >1800 patients) using dosages other than the recommended dosage: Cardiovascular disorders: transient ischemic attacks, pericarditis Gastrointestinal disorders: duodenal ulcer; gastrointestinal necrosis, tracheo-esophageal fistula Nervous system disorders: meningitis, brain edema Renal and urinary disorders: nephritis (allergic) In the same clinical population, the following fatal events each occurred with a frequency of <1%: hyperthermia malignant; cardiac arrest; myocardial infarction; pulmonary embolism; cerebrovascular accident; intestinal perforation; hepatic failure or renal failure; severe depression leading to suicide; pulmonary edema; respiratory arrest; respiratory failure. Patients with ECOG PS of 1 or higher had a higher treatment-related mortality and serious adverse events. 6.2 Postmarketing Experience The following adverse reactions have been identified during post-approval use of Proleukin. Because these reactions are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Blood and lymphatic system disorders: neutropenia, febrile neutropenia, eosinophilia, lymphopenia Cardiac disorders: cardiomyopathy, cardiac tamponade Endocrine disorders: hyperthyroidism Gastrointestinal disorders: gastritis, intestinal obstruction General disorders and administration site conditions: injection site necrosis Hepatobiliary disorders: hepatitis, hepatosplenomegaly, cholecystitis Immune system disorders: anaphylactic reaction, angioedema, urticaria Infections and infestations: pneumonia (bacterial, fungal, viral), endocarditis, cellulitis Metabolism and nutrition disorders: hyponatremia, hypophosphatemia Musculoskeletal and connective tissue disorders: myopathy, rhabdomyolysis Nervous system disorders: encephalopathy, extrapyramidal disorder, neuralgia Psychiatric disorders: insomnia Vascular disorders: hypertension, subdural hemorrhage, subarachnoid hemorrhage, cerebral hemorrhage, retroperitoneal hemorrhage

Drug interaction studies with Proleukin have not been conducted. The drug interaction information described below have been observed post-marketing. See Full Prescribing Information for important drug interactions. ( 7 ) 7.1 Effect of Other Drugs on Proleukin Glucocorticoids Avoid concomitant use of glucocorticoids. Coadministration with glucocorticoids may reduce aldesleukin antitumor effectiveness. 7.2 Effect of Proleukin on Other Drugs Radiographic Iodinated Contrast Media Monitor for delayed adverse reactions in patients receiving iodinated contrast media following Proleukin. Administration of radiographic iodinated contrast media following administration of interleukin-2 resulted in acute, atypical adverse reactions that resemble the immediate side effects caused by Proleukin in some patients [see Warnings and Precautions (5.8) ] . Effect on Cytochrome P-450 Substrates For certain CYP substrates, minimal changes in the concentration may lead to serious adverse reactions. Monitor for toxicity or drug concentration changes of such CYP substrates when co-administered with Proleukin. Aldesleukin causes release of cytokines [see Clinical Pharmacology (12.2) ] that may suppress activity of CYP enzymes, resulting in increased exposure of CYP substrates.

Store unopened vials refrigerated at 2° to 8°C (36° to 46°F) in the original carton to protect from light. Do not use beyond the expiration date printed on the vial. NOTE: This product contains no preservative.