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Introduction: Neurotoxicity is a major adverse event (AE) of CAR-T therapy with diverse presentation. When severe, it can be fatal, and may lead to neurologic sequelae as well as contribute to increased health care utilization, driving up cost of therapy. In clinical trials, the most common neurologic AEs with axicabtagene ciloleucel (axi-cel) and tisagenlecleucel (tis-cel) included encephalopathy, headache, tremor, dizziness, aphasia, delirium, insomnia and anxiety. Fatal and serious cases of cerebral edema, leukoencephalopathy and/ or seizures have been reported with both agents. In this real-world analysis, we reviewed post-marketing case reports from the FDA Adverse Events Reporting System (FAERS). Database involving axi-cel or tis-cel for large B cell lymphoma (LBCL), with the dual objectives of characterizing the various components of neurotoxicity and assessing the association of neurological (neuro) AEs with demographic and treatment factors as well as with other AEs reported with CAR-T cell therapy use. Methods: The FAERS database contains anonymized reports of product-related AEs, classified using the Medical Dictionary for Regulatory Activities (MedDRA) and categorized as serious or non-serious. The FAERS database was queried for cases involving axi-cel or tis-cel (and their respective trade names) from the FDA approval date for the LBCL indication (October 18, 2017 for axi-cel; May 1, 2018 for tis-cel) through March 31, 2019. Cases were excluded if patient age was unknown or if the case was reported outside the US. Of all patients reported to have neuro AEs, the frequency of various components was collected. The association of neuro AEs with patient age, concomitant AEs and key lab abnormalities were evaluated by Fisher's exact test, using a two-sided α=0.05 to determine statistical significance. Median age in each subgroup was compared using the Mann-Whitney U test. Results: In the 397 case reports identified, the majority of reactions (376, 95%) were classified as serious. Overall, 258 (65%) were reported to have neuro AEs, with "neurotoxicity" reported in 170 cases (66%); encephalopathy including CAR-T cell-related, metabolic and toxic in 92 cases (36%); seizures including status epilepticus, myoclonus and partial seizures in 12 cases (5%); stroke including cerebrovascular accident, hemiparesis, basal ganglia, brain stem, cerebellar and cerebral infarcts, motor dysfunction, facial and cranial nerve paralysis in 13 cases (5%); speech disorders including terms of aphasia, dysarthria, speech and language impairment in 55 cases (21%); amnesia and memory impairment in 18 cases (7%); brain or spinal cord edema and increased intracranial pressure in 6 cases (2%). Peripheral neuropathy was reported in 5 cases (2%). Symptoms of headache, tremors, dizziness and somnolence were reported in 30 (12%), 41 (16%) 3 (1%) and 34 (13%) cases respectively. Confusional state, delirium or agitation were reported in 61 cases (24%). Neuro AEs were associated with use of axi-cel vs. tis-cel (69% vs. 24%, p 0.05). Conclusions: Neuro AEs were common with CAR-T cell therapy in the real world and largely resembled those reported in clinical trials. Neuro AEs were associated with the agent used, age ≥65 as well as the presence of CRS, cardiac and psychiatric AEs but not with any of the laboratory values studied. The limitations of this study include its retrospective nature, potential under-reporting to FAERS and the relatively small number of patients in the tis-cel group due to its later approval and shorter time available for uptake compared to axi-cel. Despite these limitations, our findings can serve to inform clinicians' decision making when treating adult patients with CAR-T cell therapy. Further research is needed to better discern the etiopathology and biomarkers of neuro AEs in CAR-T cell therapy. Disclosures Gajra: Cardinal Health: Employment. Zettler:Cardinal Health: Employment. Phillips Jr.:Cardinal Health: Employment. Klink:Cardinal Health: Employment. Kish:Cardinal Health: Employment. Mehta:Cardinal Health: Employment. Feinberg:Cardinal Health: Employment.

Introduction: Axicabtagene ciloleucel (axi-cel) and tisagenlecleucel (tis-cel) are chimeric antigen receptor (CAR) T-cell therapies that target CD19-expressing B cells. Both therapies have been approved by the United States (US) Food and Drug Administration (FDA) for the treatment of adult patients with relapsed or refractory large B-cell lymphoma (LBCL) after at least 2 lines of systemic therapy. The median age at diagnosis of diffuse LBCL is 66 years, with over half the cases occurring in patients over age 65. Patients >65 years have worse survival than younger patients. Despite this predilection for older age, only one quarter of the patients in the pivotal trials supporting approval of the 2 therapies were age 65 or older. An analysis of the safety of axi-cel in the pivotal ZUMA-1 trial showed no significant differences between the age Methods: The FAERS database contains anonymized reports of product-related AEs, classified using the Medical Dictionary for Regulatory Activities (MedDRA) and categorized as serious or non-serious. The database was queried for cases involving axi-cel or tis-cel (and their respective trade names) from the FDA approval date for the LBCL indication (October 18, 2017 for axi-cel; May 1, 2018 for tis-cel) through March 31, 2019. Cases were excluded if the age of the patient was unknown. Cases reported outside the US were excluded. Patient characteristics and adverse events were summarized using descriptive statistics. Comparisons of rates of AEs by age group were made using Fisher's exact test; statistical significance was determined at a two-sided α=0.05. Results: A total of 397 cases were retrieved (360 involving axi-cel, 37 involving tis-cel). The median age of the patients involved was 62 years (range 18-81), with 153 (39%) of the patients age 65 or older. The vast majority of reactions (376, 95%) reported to FAERS were classified as serious. Overall, 141 (36%) cases resulted in hospitalization; 33 (8%) cases had an outcome categorized as life-threatening; 46 (12%) cases resulted in death; 6 (2%) resulted in disability. The most common reaction in each age group was cytokine release syndrome (CRS), reported in 64% and 56% of patients Conclusions: This large-scale post-marketing report of CAR T-cell therapy associated AEs in the real world suggests differences based on age: patients ≥65 had a higher incidence of neurotoxicity and atrial fibrillation while younger patients had increased incidence of some CRS components, especially pyrexia and tachycardia. There was no demonstrable difference in deaths between the 2 groups, but younger patients had higher rates of hospitalization. This report provides real-world evidence for use of CAR T-cell therapy in patients ≥65 and can inform clinical care based on patterns of AEs observed. Potential under-reporting of cases to the FAERS database, the retrospective design of this study and limited data available in the case reports preclude interpretation of causality. Despite these limitations, our findings identified real-world trends in reported signals that complement clinical trial safety data and support further pharmacoepidemiologic study. Disclosures Zettler: Cardinal Health: Employment. Feinberg:Cardinal Health: Employment. Phillips Jr.:Cardinal Health: Employment. Klink:Cardinal Health: Employment. Mehta:Cardinal Health: Employment. Gajra:Cardinal Health: Employment.