2.1 Recommended Dosage

2.2 Preparation Instructions

KANUMA is for intravenous infusion only. Prepare KANUMA using the following steps.

2.3 Administration Instructions

Administer the diluted solution as an intravenous infusion using a low-protein binding infusion set with an in-line, low-protein binding 0.2 micron filter.

Infuse over at least 2 hours. Consider further prolonging the infusion time for patients receiving dosages greater than 1 mg/kg or those who have experienced hypersensitivity reactions [see Warnings and Precautions (5.1)]. A 1-hour infusion may be considered for those patients receiving the 1 mg/kg dose who tolerate the infusion.

2.4 Storage of Diluted Solution

KANUMA contains no preservatives; therefore, product should be used immediately after dilution. If immediate use is not possible, the diluted product may be stored up to 24 hours in the refrigerator at 2°C to 8°C (36°F to 46°F). Do not freeze or shake. Protect from light.

5.1 Hypersensitivity Reactions Including Anaphylaxis

Hypersensitivity reactions, including anaphylaxis, have been reported in KANUMA-treated patients, based on application of Sampson criteria to identify signs/symptoms consistent with anaphylaxis. In clinical trials, 3 (infants) of 106 (3%) patients treated with KANUMA experienced signs and symptoms consistent with anaphylaxis. These patients experienced reactions during infusion with signs and symptoms including chest discomfort, conjunctival injection, dyspnea, generalized and itchy rash, hyperemia, swelling of eyelids, rhinorrhea, severe respiratory distress, tachycardia, tachypnea, and urticaria. Anaphylaxis has occurred as early as the sixth infusion and as late as 1 year after treatment initiation.

In clinical trials, 21 of 106 (20%) KANUMA-treated patients, including 9 of 14 (64%) infants and 12 of 92 (13%) pediatric patients who were 4 years and older and adults, experienced signs and symptoms either consistent with or that may be related to a hypersensitivity reaction. Signs and symptoms of hypersensitivity reactions, occurring in two or more patients, included abdominal pain, agitation, fever, chills, diarrhea, eczema, edema, hypertension, irritability, laryngeal edema, nausea, pallor, pruritus, rash, and vomiting. The majority of reactions occurred during or within 4 hours of the completion of the infusion. Patients were not routinely pre-medicated prior to infusion of KANUMA in these clinical trials.

Due to the potential for anaphylaxis, appropriate medical support should be readily available when KANUMA is administered. If anaphylaxis occurs, immediately discontinue the infusion and initiate appropriate medical treatment. Observe patients closely during and after the infusion. Inform patients of the signs and symptoms of anaphylaxis and instruct them to seek immediate medical care should signs and symptoms occur.

The management of hypersensitivity reactions should be based on the severity of the reaction and may include temporarily interrupting the infusion, lowering the infusion rate, and/or treatment with antihistamines, antipyretics, and/or corticosteroids. If interrupted, the infusion may be resumed at a slower rate with increases as tolerated. Pre-treatment with antipyretics and/or antihistamines may prevent subsequent reactions in those cases where symptomatic treatment was required. If a severe hypersensitivity reaction occurs, immediately discontinue the infusion and initiate appropriate medical treatment.

Consider the risks and benefits of re-administering KANUMA following a severe reaction. Monitor patients, with appropriate resuscitation measures available, if the decision is made to re-administer the product.

5.2 Hypersensitivity to Eggs or Egg Products

KANUMA is produced in the egg whites of genetically engineered chickens. Patients with a known history of egg allergies were excluded from the clinical trials. Consider the risks and benefits of treatment with KANUMA in patients with known systemic hypersensitivity reactions to eggs or egg products.

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 clinical practice.

In clinical trials, a total of 106 patients received treatment with KANUMA. The data described below reflect exposure to KANUMA in 75 patients who received KANUMA at dosages up to 3 mg/kg once weekly in clinical trials:

• Nine patients (5 males, 4 females) who had growth failure or other evidence of rapidly progressive LAL deficiency presenting within the first 6 months of life received KANUMA for up to 165 weeks (median 60 weeks) at escalating doses ranging between 0.35 mg/kg and 5 mg/kg once weekly [see Clinical Studies (14.1)].
• 66 pediatric and adult patients with LAL deficiency aged 4 to 58 years (33 males, 33 females) received KANUMA 1 mg/kg every other week for up to 36 weeks.

Table 2 summarizes the most common adverse reactions occurring in >30% of patients with rapidly progressive LAL deficiency presenting within the first 6 months of life receiving KANUMA in Study 1.

Other less common adverse reactions reported in patients with rapidly progressive disease presenting within the first 6 months of life who received KANUMA included hypotonia, decreased oxygen saturation, retching, sneezing, and tachycardia.

For infant patients within Study 1 and Study 3 (n = 19), the following additional adverse reactions were reported in ≥ 30% of infants who received Kanuma since the time of marketing authorization, including patients who received an escalated dose to 5 mg/kg qw: hypersensitivity, respiratory distress, and tachycardia.

Table 3 summarizes the most common adverse reactions that occurred in ≥8% of pediatric and adult patients with LAL deficiency receiving KANUMA in Study 2.

Other less common adverse reactions reported in pediatric and adult patients who received KANUMA included anxiety and chest discomfort.

For pediatric and adult patients (n = 106), the following additional adverse reactions were reported in ≥ 8% of pediatric and adult patients who received Kanuma since the time of marketing authorization, including patients who received an escalated dose to 3 mg/kg qw: hypersensitivity, diarrhea, abdominal pain, and dizziness.

6.2 Immunogenicity

As with all therapeutic proteins, there is potential for immunogenicity. The detection of antibody formation is highly dependent on the sensitivity and specificity of the assay and may be influenced by several factors including assay methodology, sample handling, timing of sample collection, concomitant medications, and underlying disease. For these reasons, comparison of the incidence of antibodies in the studies described below with the incidence of antibodies in other studies or to other sebelipase alfa products may be misleading.

Approximately 8% (9/106) of pediatric and adult patients with LAL deficiency developed antibodies to sebelipase alfa (anti-drug antibodies or ADA) following treatment with KANUMA across all clinical studies. Among the 9 patients who developed ADA, 2 patients were positive for neutralizing antibodies (NAb). Approximately 53% (10/19) of infants with rapidly progressive LAL deficiency developed ADA following treatment with KANUMA across all clinical studies. Among the 10 patients who developed ADA, 9 patients were positive for NAb.

8.1 Pregnancy

8.2 Lactation

8.4 Pediatric Use

Safety and effectiveness of KANUMA have been established in pediatric patients aged 1 month and older. Clinical trials with KANUMA were conducted in 56 pediatric patients (range 1 month to <18 years old) [see Clinical Studies (14)].

8.5 Geriatric Use

Clinical trials of KANUMA did not include any patients aged 65 years old and older. It is not known whether they respond differently than younger patients.

12.1 Mechanism of Action

LAL deficiency is an autosomal recessive lysosomal storage disorder characterized by a genetic defect resulting in a marked decrease or loss in activity of the lysosomal acid lipase (LAL) enzyme. The primary site of action of the LAL enzyme is the lysosome, where the enzyme normally causes the breakdown of lipid particles, including LDL-c and triglycerides. Deficient LAL enzyme activity results in progressive complications due to the lysosomal accumulation of cholesteryl esters and triglycerides in multiple organs, including the liver, spleen, intestine, and the walls of blood vessels. The resulting lipid accumulation in the liver may lead to increased liver fat content and progression of liver disease, including fibrosis and cirrhosis. Lipid accumulation in the intestinal wall leads to malabsorption and growth failure. In parallel, dyslipidemia due to impaired degradation of lysosomal lipid is common with elevated LDL-c and triglycerides and low HDL-cholesterol (HDL-c).

Sebelipase alfa binds to cell surface receptors via glycans expressed on the protein and is subsequently internalized into lysosomes. Sebelipase alfa catalyzes the lysosomal hydrolysis of cholesteryl esters and triglycerides to free cholesterol, glycerol and free fatty acids.

12.2 Pharmacodynamics

In clinical trials, after initiation of dosing with KANUMA, breakdown of accumulated lysosomal lipid led to initial increases in LDL-c and triglycerides within the first 2 to 4 weeks of treatment. In general, following increases in LDL-c and triglycerides, these parameters decreased to below pre-treatment values within 8 weeks of treatment with KANUMA.

In all patients with elevated alanine aminotransferase (ALT) values at baseline (82 of 84 patients in clinical trials), reductions in ALT values were observed, generally within 2 weeks after initiation of treatment with KANUMA. Treatment interruption resulted in increases in LDL-c and ALT values and decreases in HDL-c.

12.3 Pharmacokinetics

The pharmacokinetic profile of sebelipase alfa was nonlinear with a greater than dose-proportional increase in exposure between 1 and 3 mg/kg based on non-compartmental analysis of data from 26 adults. No accumulation was observed following once weekly or once every other week dosing.

Using a population pharmacokinetic model, sebelipase alfa pharmacokinetic parameters were estimated for 65 pediatric and adult patients who received intravenous infusions of KANUMA at 1 mg/kg at Week 22 (Table 4); 24 patients were 4 to 11 years old, 23 were 12 to 17 years old, and 18 were adults. The pharmacokinetic profiles of sebelipase alfa were similar between adolescents and adults. The Tmax and T1/2 were similar across all age groups.

13.1 Carcinogenesis, Mutagenesis, Impairment of Fertility

Long-term studies in animals to evaluate carcinogenic potential or studies to evaluate mutagenic potential have not been performed with sebelipase alfa. Sebelipase alfa at intravenous doses up to 60 mg/kg administered twice weekly (approximately 164 times the human AUC of 1387 ng.h/mL at 1 mg/kg dose administered once every other week) was found to have no adverse effect on fertility and reproductive performance of male and female rats.

13.2 Animal Toxicology and/or Pharmacology

In a rat disease model of LAL deficiency that exhibits several abnormalities analogous to the human disease, sebelipase alfa administered intravenously at dosages up to 3 mg/kg once weekly showed improvements in survival, body weight gain, organ weight reduction, reduction in serum transaminases (ALT and aspartate aminotransferase [AST]), reduction in serum and hepatic lipids, and improvement in liver histopathology.

14.1 Infants with Rapidly Progressive LAL Deficiency Presenting within the First 6 Months of Life

A multicenter, open-label, single-arm clinical study of KANUMA was conducted in 9 infants with LAL deficiency who had growth failure or other evidence of rapidly progressive disease prior to 6 months of age. The age range at entry was 1 to 6 months. Patients received KANUMA at 0.35 mg/kg once weekly for the first 2 weeks and then 1 mg/kg once weekly. Due to suboptimal clinical response, doses in all 6 surviving patients were escalated to 3 mg/kg once weekly, between 4 and 88 weeks (median 11 weeks) after starting treatment at 1 mg/kg.

The efficacy of KANUMA was assessed by comparing the survival of the 9 KANUMA-treated patients (followed in the open-label, single-arm trial) at 12 months of age to the survival in an untreated, historical cohort of 21 patients with a similar age at disease presentation and clinical characteristics. Of the 9 KANUMA-treated patients, 6 patients survived beyond 12 months of age, compared to 0 of 21 patients who survived in the historical cohort, all of whom had died by 8 months of age. The median age of the 6 surviving KANUMA-treated patients was 18.1 months (range 12 to 42.2 months).

Following initiation of treatment with KANUMA 1 mg/kg once weekly, weight-for-age (WFA) z-scores improved in 3 of 5 surviving patients with growth failure, and all 6 surviving patients demonstrated improvements in WFA z-scores following dose escalation to 3 mg/kg once weekly.

14.2 Pediatric and Adult Patients with LAL Deficiency

The safety and efficacy of KANUMA were assessed in 66 pediatric and adult patients with LAL deficiency, aged 4 to 58 years (71% were less than 18 years old), in a multicenter, double-blind, placebo-controlled trial. Patients were randomized to receive KANUMA at a dosage of 1 mg/kg (n=36) or placebo (n=30) once every other week for 20 weeks in the double-blind period. Sixty-two of the 66 (94%) patients had LDL-c of 130 mg/dL or greater at study entry. The majority of patients (58%) had LDL-c above 190 mg/dL at study entry, and 24% of patients with LDL-c above 190 mg/dL remained on lipid lowering medications.

At the completion of the 20-week double-blind period of the trial, a statistically significant improvement in percent change from baseline in LDL-c was observed in the KANUMA-treated group as compared to the placebo group (mean difference and 95% C.I.: -22%, [-33%, -15%]; p<0.0001). LDL-c of less than 130 mg/dL was achieved in 13 of 32 (41%; 95% C.I.: [24%, 58%]) KANUMA-treated patients and in only 2 of 30 (7%; 95% C.I.: [0%, 16%]) placebo-treated patients with baseline LDL-c of 130 mg/dL or greater. A statistically significant improvement in percent change from baseline at 20 weeks was also observed in the KANUMA-treated group compared to the placebo group for other parameters related to LAL deficiency, including decreases in non-HDL-c (mean difference and 95% C.I.: -21%, [-30%, -15%]; p<0.0001) and triglycerides (mean difference and 95% C.I.: -14%, [-28%, -1%]; p=0.0375), and increases in HDL-c (mean difference and 95% C.I.: 20%, [12%, 26%]; p<0.0001). The effect of KANUMA on cardiovascular morbidity and mortality has not been established.

Patients treated with KANUMA had larger reductions from baseline in ALT values and liver fat content (measured by MRI), compared to patients treated with placebo. The significance of these findings as they relate to progression of liver disease in LAL deficiency has not been established.

Store KANUMA refrigerated at 2°C to 8°C (36°F to 46°F) in original carton to protect from light. Do not shake or freeze the vials.

Hypersensitivity Reactions, including Anaphylaxis

Advise patients and caregivers that reactions related to administration and infusion may occur during and after KANUMA treatment, including anaphylactic reactions, life-threatening anaphylaxis and severe hypersensitivity reactions. Inform patients of the signs and symptoms of anaphylactic reactions, anaphylaxis and hypersensitivity reactions, and have them seek immediate medical care should signs and symptoms occur [see Warnings and Precautions (5.1)].

Hypersensitivity to Eggs or Egg Products

KANUMA is produced in the egg whites of genetically engineered chickens. Patients with a known history of egg allergies were excluded from the clinical trials. Consider the risks and benefits of treatment with KANUMA in patients with known systemic hypersensitivity reactions to eggs or egg products. [see Warnings and Precautions (5.2)].