Voretigene neparvovec

12.1 Mechanism of Action LUXTURNA is designed to deliver a normal copy of the gene encoding the human retinoid isomerohydrolase RPE65 (RPE65) to cells of the retina in persons with reduced or absent levels of biologically active RPE65. The RPE65 is produced in the retinal pigment epithelial (RPE) cells and converts all- trans -retinol to 11- cis -retinol, which subsequently forms the chromophore, 11- cis -retinal, during the visual (retinoid) cycle. The visual cycle is critical in phototransduction, which refers to the biological conversion of a photon of light into an electrical signal in the retina. Mutations in the RPE65 gene lead to reduced or absent levels of retinoid isomerohydrolase RPE65 activity, blocking the visual cycle and resulting in impairment of vision.

1 INDICATIONS AND USAGE LUXTURNA (voretigene neparvovec-rzyl) is an adeno-associated virus vector-based gene therapy indicated for the treatment of patients with confirmed biallelic RPE65 mutation-associated retinal dystrophy. Patients must have viable retinal cells as determined by the treating physician(s). LUXTURNA is an adeno-associated virus vector-based gene therapy indicated for the treatment of patients with confirmed biallelic RPE65 mutation-associated retinal dystrophy. Patients must have viable retinal cells as determined by the treating physician(s). ( 1 )

2 DOSAGE AND ADMINISTRATION For subretinal injection only. The recommended dose of LUXTURNA for each eye is 1.5 x 10 11 vector genomes (vg), administered by subretinal injection in a total volume of 0.3 mL. (2.1 ) Perform subretinal administration of LUXTURNA to each eye on separate days within a close interval, but no fewer than 6 days apart. ( 2.1 ) Recommend systemic oral corticosteroids equivalent to prednisone at 1 mg/kg/day (maximum of 40 mg/day) for a total of 7 days (starting 3 days before administration of LUXTURNA to each eye), and followed by a tapering dose during the next 10 days. ( 2.1 ) For subretinal injection only. 2.1 Dose The recommended dose of LUXTURNA for each eye is 1.5 x 10 11 vector genomes (vg), administered by subretinal injection in a total volume of 0.3 mL. Perform subretinal administration of LUXTURNA to each eye on separate days within a close interval, but no fewer than 6 days apart. Recommend systemic oral corticosteroids equivalent to prednisone at 1 mg/kg/day (maximum of 40 mg/day) for a total of 7 days (starting 3 days before administration of LUXTURNA to the first eye), and followed by tapering the dose during the following 10 days. The same corticosteroid dosing regimen applies for the administration of LUXTURNA to the second eye. If the corticosteroid taper following LUXTURNA administration to the first eye is not complete three days prior to the planned LUXTURNA administration to the second eye, then the corticosteroid regimen for the second eye replaces the taper for the first eye. 2.2 Preparation Prepare LUXTURNA within 4 hours of administration using sterile technique under aseptic conditions in a Class II vertical laminar flow biological safety cabinet (BSC). Below is the list of items required for dilution and administration syringe preparation: One single-dose vial of LUXTURNA Two vials of Diluent One 3-mL sterile syringe One 20G 1-inch sterile needle Three 1-mL sterile syringes Three 27G ½-inch sterile needles Two sterile syringe caps One 10-mL sterile empty glass vial One sterile utility drape One sterile plastic bag Two sterile labels for administration syringes One sterile plain label One sterile skin marker Dilution of LUXTURNA Thaw one single-dose vial of LUXTURNA and two vials of Diluent at room temperature. Mix the contents of the thawed Diluent vials by gently inverting them approximately 5 times. Inspect the Diluent vials. If particulates, cloudiness, or discoloration are visible, do not use the vial(s); new vial(s) of Diluent should be used. Obtain a 3-mL sterile syringe, a 20G 1-inch sterile needle, and a 10-mL sterile empty glass vial. Using the 3-mL syringe with 20G 1-inch needle, transfer 2.7 mL of Diluent to the 10-mL glass vial. Dispose of the needle and syringe in an appropriate container. Mix the contents of the thawed LUXTURNA single-dose vial by gently inverting approximately 5 times. Inspect the LUXTURNA single-dose vial. If particulates, cloudiness, or discoloration are visible, do not use the vial; a new single-dose vial of LUXTURNA should be used. Draw 0.3 mL of LUXTURNA into a 1-mL sterile syringe with a 27G ½-inch sterile needle. (Figure 1) Figure 1. Syringe with 0.3 mL LUXTURNA 9. Transfer 0.3 mL of LUXTURNA to the glass vial containing 2.7 mL of Diluent from Step 5. Gently invert the 10-mL glass vial approximately 5 times to mix the contents. 10. Using the sterile plain label and sterile skin marker, label the 10-mL glass vial containing the diluted LUXTURNA as follows: "Diluted LUXTURNA". 11. Remove all items from the BSC except the glass vial labeled 'Diluted LUXTURNA' and the sterile skin marker. 12. Re-sanitize the BSC prior to the next steps and place the glass vial and the sterile marker to the left side in the BSC. Preparation of LUXTURNA for Injection To keep the syringes sterile, two operators are required for transfer of the contents of the 10-mL glass vial labeled 'Diluted LUXTURNA' into each of two sterile 1-mL syringes. 13. Place a sterile utility drape, a sterile plastic bag, and two sterile labels into the BSC. 14. Place the sterile drape near the Primary Operator on the right side of the sanitized BSC surface, away from the diluted LUXTURNA. 15. The Secondary Operator unwraps two 1-mL syringes, two 27G ½-inch needles, and two syringe caps in the BSC, ensuring that the Primary Operator touches only sterile surfaces while transferring the items onto the sterile drape. 16. The Secondary Operator changes to a new pair of sterile gloves and stands or sits to the left of the Primary Operator. The Secondary Operator holds the 10-mL glass vial containing the diluted LUXTURNA (Figure 2a). Figure 2a. First Position of the Operators During Preparation of LUXTURNA Syringes 17. The Primary Operator withdraws 0.8 mL of the diluted LUXTURNA into a sterile 1-mL syringe using a 27G ½-inch sterile needle while the secondary operator holds the 10-mL glass vial. After the insertion of the needle, the Secondary Operator inverts the 10-mL

6 ADVERSE REACTIONS The most common adverse reactions (incidence ≥ 5%) were conjunctival hyperemia, cataract, increased intraocular pressure, retinal tear, dellen (thinning of the corneal stroma), macular hole, subretinal deposits, eye inflammation, eye irritation, eye pain, and maculopathy (wrinkling on the surface of the macula). The most common adverse reactions (incidence ≥ 5%) in the clinical trials were conjunctival hyperemia, cataract, increased intraocular pressure, retinal tear, dellen (thinning of the corneal stroma), macular hole, subretinal deposits, eye inflammation, eye irritation, eye pain, and maculopathy (wrinkling on the surface of the macula). ( 6 ) To report SUSPECTED ADVERSE REACTIONS, contact Spark Therapeutics, Inc. at 1-855-SPARKTX, 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 other products and may not reflect the rates observed in practice. The safety data described in this section reflect exposure to LUXTURNA in two clinical trials consisting of 41 subjects (81 eyes) with confirmed biallelic RPE65 mutation-associated retinal dystrophy. Forty of the 41 subjects received sequential subretinal injections of LUXTURNA to each eye. One subject received LUXTURNA in only one eye. Seventy-two of the 81 eyes were exposed to the recommended dose of LUXTURNA at 1.5 x 10 11 vg; 9 eyes were exposed to lower doses of LUXTURNA. Study 1 (n=12) was an open-label, dose-exploration safety study. Study 2 (n=29) was an open-label, randomized, controlled study for both efficacy and safety [ see Clinical Studies ( 14 ) ]. The average age of the 41 subjects was 17 years, ranging from 4 to 44 years. Of the 41 subjects, 25 (61%) were pediatric subjects under 18 years of age, and 23 (56%) were females. Twenty-seven (27/41, 66%) subjects had ocular adverse reactions that involved 46 injected eyes (46/81, 57%). Adverse reactions among all subjects in Studies 1 and 2 are described in Table 1. Adverse reactions may have been related to voretigene neparvovec-rzyl, the subretinal injection procedure, the concomitant use of corticosteroids, or a combination of these procedures and products. Table 1. Ocular Adverse Reactions Following Treatment with LUXTURNA (N=41) Adverse Reactions Subjects n=41 Treated Eyes n=81 Any ocular adverse reaction 27 (66%) 46 (57%) Conjunctival hyperemia 9 (22%) 9 (11%) Cataract 8 (20%) 15 (19%) Increased intraocular pressure 6 (15%) 8 (10%) Retinal tear 4 (10%) 4 (5%) Dellen (thinning of the corneal stroma) 3 (7%) 3 (4%) Macular hole 3 (7%) 3 (4%) Subretinal deposits* 3 (7%) 3 (4%) Eye inflammation 2 (5%) 4 (5%) Eye irritation 2 (5%) 2 (2%) Eye pain 2 (5%) 2 (2%) Maculopathy (wrinkling on the surface of the macula) 2 (5%) 3 (4%) Foveal thinning and loss of foveal function 1 (2%) 2 (2%) Endophthalmitis 1 (2%) 1 (1%) Foveal dehiscence (separation of the retinal layers in the center of the macula) 1 (2%) 1 (1%) Retinal hemorrhage 1 (2%) 1 (1%) *Transient appearance of asymptomatic subretinal precipitates inferior to the retinal injection site 1-6 days after injection Immunogenicity At all doses of LUXTURNA evaluated in Studies 1 and 2, immune reactions and extra-ocular exposure were mild. In Study 1 (n=12), the interval between the subretinal injections into the two eyes ranged from 1.7 to 4.6 years. In Study 2, the interval between the subretinal injections into the two eyes ranged from 7 to 14 days. No subject had a clinically significant cytotoxic T-cell response to either AAV2 or RPE65. Subjects received systemic corticosteroids before and after subretinal injection of LUXTURNA to each eye. The corticosteroids may have decreased the potential immune reaction to either vector capsid (adeno-associated virus serotype 2 [AAV2] vector) or transgene product (retinoid isomerohydrolase RPE65 [RPE65]). 6.2 Postmarketing Experience The following adverse reactions have been identified during postapproval use of LUXTURNA. Because these reactions are reported voluntarily, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure. Eye Disorders: chorioretinal atrophy (also reported as retinal degeneration, retinal depigmentation, and injection site atrophy).