Obecabtagene Autoleucel

1 INDICATION AND USAGE AUCATZYL is indicated for the treatment of adults with relapsed or refractory B-cell precursor acute lymphoblastic leukemia (ALL). AUCATZYL is a CD19-directed genetically modified autologous T cell immunotherapy indicated for the treatment of adults with relapsed or refractory B-cell precursor acute lymphoblastic leukemia (ALL) ( 1 ).

12.1 Mechanism of Action AUCATZYL is a CD19-directed genetically modified autologous T cell immunotherapy consisting of the patient's own T cells expressing an anti-CD19 CAR. Engagement of anti-CD19 CAR-positive T cells with CD19 expressed on target cells, such as cancer cells and normal B cells, leads to activation of the anti-CD19 CAR-positive T cells and downstream signaling through the CD3-zeta domain. Proliferation and persistence by the anti-CD19 CAR-positive T cells following activation are enhanced by the presence of the 4-1BB co-stimulatory domain. This binding to CD19 results in anti-tumor activity and killing of CD19-expressing target cells.

2 DOSAGE AND ADMINISTRATION For autologous use only. For intravenous use only. Do NOT use a leukodepleting filter ( 2.4 ). Prior to infusion Administer a lymphodepleting chemotherapy regimen of fludarabine/cyclophosphamide. ( 2.3 ). Ensure availability of bone marrow assessment results from a sample obtained within 7 days prior to start of lymphodepleting chemotherapy ( 2.3 ). Premedicate with acetaminophen ( 2.3 ). Confirm availability of tocilizumab prior to infusion ( 2.3 ). AUCATZYL Dose and Administration Verify patient's identity prior to infusion ( 2.3 ). Dosing is based on the Dose Schedule Planner ( 2.3 ). The total recommended dose of AUCATZYL is 410 × 10 6 CD19 chimeric antigen receptor (CAR)-positive viable T cells ( 2.1 ). The treatment regimen consists of a split dose infusion to be administered on Day 1 and Day 10 (± 2 days) ( 2.1 ). Dose to be administered is determined by the patient bone marrow blast assessment. See Full Prescribing Information for important preparation and administration information ( 2.3 , 2.4 ). 2.1 Dose For autologous use only. For intravenous use only. Strictly follow Administration instructions to minimize dosing errors [see Overdosage (10) ] . The total recommended dose of AUCATZYL is 410 × 10 6 CD19 chimeric antigen receptor (CAR)-positive viable T cells supplied in three to five infusion bags. Bags are supplied in three color-coded bag configurations (10 × 10 6 , 100 × 10 6 , 300 × 10 6 ) for split dose administration. Table 1: AUCATZYL Infusion Bag Configurations CAR-positive T Cell Dose (Bag Configuration) Color Code Volume Fully Infused 10 × 10 6 Blue 10 mL No (See Section 2.3 ) 100 × 10 6 Orange Variable Yes 300 × 10 6 Red Variable Yes The treatment regimen consists of a split dose infusion to be administered on Day 1 and Day 10 (± 2 days), see Figure 1 and Figure 3 . The dosage regimen will be determined by the tumor burden assessed by bone marrow blast percentage from a sample obtained within 7 days prior to the start of lymphodepletion [see Dosing and Administration (2.3 , 2.4) , Figure 1 and Figure 3 ] . See the Release for Infusion certificate and Dose Schedule Planner for the actual cell counts and volumes to be infused and to select the appropriate dosage regimen [see Dosage and Administration (2.4) and Dosage Forms and Strengths (3) ] . 2.2 Dosage Modification for Adverse Reactions Table 2: Dosage Modifications Intended to Reduce the Risk of Adverse Reactions Adverse Event Severity 1. Based on the Common Terminology Criteria for Adverse Events (CTCAE) v5.0. Grade 1 is mild, Grade 2 is moderate, Grade 3 is severe, and Grade 4 is life-threatening. Actions Second Split Dose Day 10 (± 2 days) Cytokine Release Syndrome following the first split dose [see Warnings and Precautions (5.1) ]. Grade 2 Consider postponing AUCATZYL infusion up to Day 21 to allow for the CRS to resolve to Grade ≤ 1. Grade ≥ 3 Discontinue treatment. Immune Effector Cell-associated Neurotoxicity Syndrome following the first split dose [see Warnings and Precautions (5.2) ]. Grade 1 Consider postponing AUCATZYL infusion up to Day 21 to allow for the ICANS to completely resolve. Grade ≥ 2 Discontinue treatment. Pulmonary or cardiac toxicities following the first split dose. Grade ≥ 3 Discontinue treatment. Severe intercurrent infection at the time of AUCATZYL infusion [see Warnings and Precautions (5.4) ]. Grade ≥ 3 Consider postponing AUCATZYL infusion up to Day 21 until the severe intercurrent infection is considered controlled. Requirement for supplementary oxygen. Grade ≥ 3 Consider postponing AUCATZYL treatment up to Day 21 to allow for the adverse reaction to resolve. Other clinically relevant adverse reactions following the first split dose [see Warnings and Precautions (5) ]. Grade ≥ 3 Consider postponing AUCATZYL infusion up to Day 21 to allow for the adverse reaction to resolve. 2.3 Administration AUCATZYL is for autologous use only. The patient's identity must match the patient identifiers on the

6 ADVERSE REACTIONS The most common (non-laboratory) adverse reactions (incidence ≥ 20%) are: CRS, infections - pathogen unspecified, musculoskeletal pain, viral infections, fever, nausea, bacterial infectious disorders, diarrhea, febrile neutropenia, ICANS, hypotension, pain, fatigue, headache, encephalopathy, and hemorrhage ( 6.1 ). To report SUSPECTED ADVERSE REACTIONS, contact Autolus Inc at toll-free phone 1-855-288-5227 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch ( 17 ). 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 AUCATZYL was evaluated in the FELIX study in which 100 patients with relapsed or refractory B-cell acute lymphoblastic leukemia (B-ALL) received AUCATZYL at a median dose of 410 × 10 6 CD19 CAR-positive viable T cells (range: 10 to 480 × 10 6 CD19 CAR-positive viable T cells with 90% of patients receiving the recommended dose of 410 × 10 6 ± 25%) [see Clinical Studies (14) ] . The most common serious adverse reactions of any Grade (incidence ≥ 2%) included infections-pathogen unspecified, febrile neutropenia, ICANS, CRS, fever, bacterial infectious disorders, encephalopathy, fungal infections, hemorrhage, respiratory failure, hypotension, ascites, HLH/MAS, thrombosis and hypoxia. Nine patients (9%) experienced fatal adverse reactions which included infections (sepsis, pneumonia, peritonitis), ascites, pulmonary embolism, acute respiratory distress syndrome, HLH/MAS and ICANS. Of the 9 patients, five patients who died from infections had pre-existing and ongoing neutropenia prior to receiving bridging therapy, lymphodepletion chemotherapy treatment and/or AUCATZYL. Table 3 summarizes the adverse reactions (excluding laboratory abnormalities) that occurred in at least 10% of patients. Table 4 presents the most common Grade 3 or 4 laboratory abnormalities, occurring in at least 10% of patients. Table 3: Adverse Reactions Occurring in ≥ 10% of Patients in FELIX Study (N=100) Adverse Reaction Any Grade (%) Grade 3 or Higher (%) Blood and lymphatic system disorders Febrile neutropenia 26 26 Coagulopathy Is a composite that includes multiple related terms. 10 6 Cardiac disorders Tachycardia 12 0 Gastrointestinal disorders Nausea 29 2 Diarrhea 26 0 Vomiting 18 0 Abdominal pain 16 1 Constipation 11 0 General disorders and administration site conditions Fever 29 1 Pain 23 0 Fatigue 22 3 Edema 12 0 Chills 11 0 Immune system disorders Cytokine release syndrome 75 3 Hypogammaglobulinemia 10 2 Infections and infestations Infections - pathogen unspecified 44 31 Viral infections excluding COVID-19 16 1 COVID-19 18 6 Bacterial infections 26 11 Fungal infections 15 5 Investigations Weight decreased 11 2 Metabolism and nutrition disorders Decreased appetite 13 3 Musculoskeletal and connective tissue disorders Musculoskeletal pain 36 4 Nervous system disorders Immune effector cell-associated neurotoxicity syndrome 24 7 Headache 22 0 Encephalopathy Encephalopathy includes aphasia, cognitive disorder, confusional state, depressed level of consciousness, disturbance in attention, dysarthria, dysgraphia, encephalopathy, lethargy, memory impairment, mental status changes, posterior reversible encephalopathy syndrome, somnolence. 21 4 Dizziness 14 0 Respiratory, thoracic and mediastinal disorders Cough 14 0 Skin and subcutaneous tissue disorders Rash 17 1 Vascular disorders Hypotension 23 4 Hemorrhage 20 4 Other clinically important adverse reactions that occurred in less than 10% of patients treated with AUCATZYL include the following: Cardiac disorders: arrhythmia (5%), palpitations (2%), cardiac failure (1%). Endocrine disorders: adrenal insufficiency (2%). Eye disorders: visual impairment (2%). Gastrointestinal disorders: stomatitis (5%), ascites (4%). Immune system d

5 WARNINGS AND PRECAUTIONS Prolonged Cytopenias: Patients may exhibit Grade 3 or higher cytopenias for several weeks following AUCATZYL infusion. Monitor complete blood counts ( 5.3 ). Infections: Monitor patients for signs and symptoms of infection; treat appropriately ( 5.4 ). Hypogammaglobulinemia: Monitor and consider immunoglobulin replacement therapy ( 5.5 ). Hemophagocytic Lymphohistiocytosis/ Macrophage Activation Syndrome: Administer treatment per institutional standards ( 5.6 ). Hypersensitivity Reactions: Monitor for hypersensitivity reactions during infusion ( 5.7 ). Secondary Malignancies: T cell malignancies have occurred following treatment of hematologic malignancies with BCMA- and CD19-directed genetically modified autologous T cell immunotherapies. In the event that a secondary malignancy occurs after treatment with AUCATZYL, contact Autolus Inc at 1-855-288-5227 ( 5.8 ). 5.1 Cytokine Release Syndrome Cytokine Release Syndrome (CRS) occurred following treatment with AUCATZYL. CRS was reported in 75% (75/100) of patients including Grade 3 CRS in 3% of patients. The median time to onset of CRS was 8 days (range: 1 to 23 days) with a median duration of 5 days (range: 1 to 21 days). Sixty-eight percent of patients (51/75) experienced CRS after the first infusion, but prior to the second infusion of AUCATZYL with a median time to onset of 6 days (range: 1 to 10 days). Among patients with CRS, the most common manifestations of CRS included fever (100%), hypotension (35%) and hypoxia (19%) [see Adverse Reactions (6) ] . The primary treatment for CRS was tocilizumab (73%; 55/75), with patients also receiving corticosteroids (21%; 16/75). Prior to administering AUCATZYL, ensure that healthcare providers have immediate access to medications and resuscitative equipment to manage CRS. During and following treatment with AUCATZYL, closely monitor patients for signs and symptoms of CRS daily for at least 7 days following each infusion. Continue to monitor patients for CRS for at least 2 weeks following each infusion with AUCATZYL [see Dosage and Administration (2.1) ] . Counsel patients to seek immediate medical attention should signs or symptoms of CRS occur at any time. At the first sign of CRS, immediately evaluate the patient for hospitalization and institute treatment with supportive care based on severity and consider further management per current practice guidelines. 5.2 Neurologic Toxicities Neurologic toxicities including Immune Effector Cell-associated Neurotoxicity Syndrome (ICANS), which were fatal or life-threatening, occurred following treatment with AUCATZYL. Neurologic toxicities were reported in 64% (64/100) of patients, including Grade ≥ 3 in 12% of patients. The median time to onset of neurologic toxicities was 10 days (range: 1 to 246 days) with a median duration of 13 days (range: 1 to 904 days). Fifty-five percent of patients (35/64) experienced neurologic toxicities after the first infusion but prior to the second infusion of AUCATZYL with a median time to onset of 6 days (range: 1 to 11 days). Among patients with neurologic toxicities, the most common symptoms (> 5%) included ICANS (38%), headache (34%), encephalopathy (33%), dizziness (22%), tremor (13%), anxiety (9%), insomnia (9%), and delirium (8%) [see Adverse Reactions (6) ] . Immune Effector Cell-associated Neurotoxicity Syndrome (ICANS) ICANS events occurred in 24% (24/100) of patients, including Grade ≥ 3 in 7% (7/100) of patients. Of the 24 patients who experienced ICANS, 33% (8/24) experienced an onset after the first infusion, but prior to the second infusion of AUCATZYL. The median time to onset for ICANS events after the first infusion was 8 days (range: 1 to 10 days) and 6.5 days (range: 2 to 22 days) after the second infusion, with a median duration of 8.5 days (range: 1 to 53 days). Eighty-eight percent (21/24) of patients received treatment for ICANS. All treated patients received high-dose corticosteroids and 42% (10/24) of patie

4 CONTRAINDICATIONS None. None ( 4 ).

10 OVERDOSAGE In FELIX study (all cohorts N=127), occurrences of overdose were observed at the administration of the first dose in 4% (5/127) of patients. All 5 patients had bone marrow blasts > 20% and should have received a first dose of 10 × 10 6 CAR-positive viable T cells but instead received a higher dose between 68 and 103 × 10 6 CAR-positive viable T cells. CRS, ICANS and HLH, including severe events, were observed in patients who received overdose of AUCATZYL. In the event of a suspected overdose, closely monitor patients for any adverse reactions and administer treatment according to institutional practice and treatment guidelines.