OTARMENI

1 INDICATIONS AND USAGE OTARMENI is indicated for the treatment of pediatric and adult patients with severe-to-profound and profound sensorineural hearing loss (any frequency >90 dB HL) associated with molecularly confirmed biallelic variants in the OTOF gene, preserved outer hair cell function, and no prior cochlear implant in the same ear. This indication is approved under accelerated approval based on the improvement of hearing sensitivity assessed by average pure tone audiometry (PTA) at Week 24 [see Clinical Studies (14) ] . Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory clinical trial. Limitations of Use OTARMENI is not recommended in patients in whom preoperative imaging demonstrates that access to the inner ear is not feasible including those with abnormal mastoid pneumatization or clinically significant anatomic variations of the middle ear and inner ear. OTARMENI is an adeno-associated virus vector-based gene therapy indicated for the treatment of pediatric and adult patients with severe-to-profound and profound sensorineural hearing loss (any frequency >90 dB HL) associated with molecularly confirmed biallelic variants in the OTOF gene, preserved outer hair cell function, and no prior cochlear implant in the same ear. ( 1 ) This indication is approved under accelerated approval based on the improvement of hearing sensitivity assessed by average pure tone audiometry (PTA) at Week 24. Continued approval for this indication may be contingent upon verification and description of clinical benefit in the confirmatory clinical trial. ( 1 , 14 ) Limitations of Use OTARMENI is not recommended in patients in whom preoperative imaging demonstrates that access to the inner ear is not feasible including those with abnormal mastoid pneumatization or clinically significant anatomic variations of the middle ear and inner ear. ( 1 )

2 DOSAGE AND ADMINISTRATION For intracochlear infusion only. Recommended dose of OTARMENI for each ear is 7.2 × 10 12 vector genomes (vg) in a total volume of 0.24 mL, administered by a single-dose intracochlear infusion. ( 2.2 ) 2.1 Critical Dosing and Administration Information Confirm patient has biallelic, likely pathogenic or pathogenic OTOF variants. OTARMENI should be administered by a surgeon experienced in intracochlear surgery and trained in the administration procedure. Administer bilateral OTARMENI, if applicable, in a single surgical session. For prophylaxis against inflammatory and immunological responses, administer systemic oral corticosteroids equivalent in strength to prednisone at 1 mg/kg/day the day of the OTARMENI infusion, maintain the same dose for two weeks, and taper over the following two weeks. The total corticosteroid dose should not exceed 60 mg/day. For prophylaxis against post-operative infection, administer antibiotics before incision. Administer age-appropriate vaccination prior to treatment with OTARMENI. Administer vaccines at least 1 month before the first corticosteroid dose and at least 1 month after the last dose. Vaccinate patients against micro-organisms that cause meningitis before surgery as meningitis is a known risk of inner ear surgery. 2.2 Recommended Dosage For intracochlear infusion only. The recommended dose of OTARMENI for each ear is 7.2 × 10 12 vector genomes (vg) in a total volume of 0.24 mL, administered by a single-dose intracochlear infusion. 2.3 Preparation Prepare syringe containing OTARMENI using sterile technique under aseptic conditions in a Class II biological safety cabinet (BSC). Administer OTARMENI within 4 hours of puncturing the vial. Below is the list of items required for administration syringe preparation. Confirm component packaging and inspect each item prior to use and do not use if any damage is identified. One single-dose vial of OTARMENI in a sealed barrier bag (package 1 of 2) [see How Supplied/Storage and Handling (16) ] Administration Kit for use with OTARMENI (package 2 of 2) [see How Supplied/Storage and Handling (16) ] Not supplied but required: One isopropyl alcohol pad One sterile sealable plastic bag Secondary container for delivery to surgical suite Label and a pen Preparation of OTARMENI for Infusion For each treated ear, thaw one single-dose vial of OTARMENI at room temperature. The contents of the vial will thaw in approximately 30 minutes at room temperature. DO NOT thaw or warm the vial any other way. Gently invert the vial 5 times (DO NOT shake or vortex the vial). Inspect the OTARMENI vial to ensure that it is thawed, clear to slightly opalescent, and that the vial has no signs of damage. If there is any evidence of cloudiness, particulates, or color, do not use the vial. If not used immediately, store the unpunctured thawed vial in the refrigerator for up to 24 hours or at room temperature for up to 8 hours. Choose the smallest compatible syringe size, either 1 mL or 3 mL included in the kit, according to the syringe pump parameters. Discard the unused syringe. Do not open the catheter sterile packaging until transferred to the surgical suite. Prepare the septum of the OTARMENI vial using an isopropyl alcohol pad to wipe the top. Wait for the septum to dry. Secure the 21G, 1.5-inch needle onto the 1 mL or 3 mL syringe. When filling the syringe for administration, push the needle until it is completely inserted into the vial and the tip touches the bottom edge of the upright vial. Administer OTARMENI within 4 hours of puncturing the vial. Withdraw all OTARMENI vial contents into the syringe. Tilt the vial to ensure complete withdrawal. Confirm that at least 0.6 mL is available in the syringe. To prevent the introduction of air, keep the needle bevel submerged in the liquid at the bottom edge of the vial by orienting the bevel towards the vial wall (Figure 1). Figure 1: Holding the syringe with the needle pointing up, check the syringe…

5 WARNINGS AND PRECAUTIONS Procedure-Related Risks: Monitor patients for procedure-related adverse reactions with OTARMENI administration. ( 5.1 ) 5.1 Procedure-Related Risks Procedure-related adverse reactions may occur with OTARMENI administration including vertigo, tinnitus, cerebral spinal fluid leak, ipsilateral facial paresis, ipsilateral change in taste, meningitis, wound infection, mastoiditis, numbness around the ear, blood or fluid collection at surgical site, and labyrinthitis. Monitor patients for procedure-related adverse reactions with OTARMENI administration and manage accordingly.

4 CONTRAINDICATIONS None. None. ( 4 )

8.1 Pregnancy Risk Summary There are no data from the use of OTARMENI in pregnant women. Animal reproductive and developmental toxicity studies have not been conducted with OTARMENI. In the US general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.

6 ADVERSE REACTIONS The most common adverse reactions (incidence ≥5%) include otitis media, vomiting, nausea, dizziness, procedural pain, gait disturbance, and nystagmus. ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Regeneron at 1-866-500-GENE 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 data described in this section reflect exposure to OTARMENI in one study (Study DB-OTO-001) which treated 24 patients with OTOF gene associated profound sensorineural hearing loss. A total of 10 patients received unilateral dosing, and a total of 14 patients received bilateral dosing of OTARMENI at a nominal dose of 7.2 × 10 12 vg per ear. The median duration of follow-up was 45 weeks (range 9 to 115 weeks) [see Clinical Studies (14) ] . Table 1 lists the most common adverse reactions that occurred in ≥ 5% patients in Study DB-OTO-001. Table 1: Adverse Reactions Occurring in ≥5% of Patients in Study DB-OTO-001 (N=24) Adverse Reaction Overall n (%) Otitis Media 9 (38) Vomiting 8 (33) Nausea 7 (29) Dizziness 5 (21) Procedural Pain 4 (17) Gait Disturbance 2 (8) Nystagmus 2 (8) Other clinically significant adverse reactions each occurring in 1 patient included transient balance disorder (4%), abnormal otoacoustic emissions (4%), and wound dehiscence (4%).