A Study Evaluating the Safety and Efficacy of KITE-363 in Relapsed/Refractory Autoimmune Neurologic Diseases

Key Inclusion Criteria: * Reproductive status-related eligibility and contraception requirements: * Participants must agree to use protocol-specified method(s) of contraception where applicable Inclusion Criteria for multiple sclerosis (MS): MS (Relapsing and progressive forms): * Diagnosed with MS according to the 2017 revision of the McDonald diagnostic criteria Relapsing forms of MS (relapsing-remitting multiple sclerosis (RRMS), active secondary-progressive multiple sclerosis (aSPMS)): * Inadequate response to previous therapies is defined as evidence of breakthrough disease activity within 12 months prior to screening while on high efficacy disease-modifying therapy (DMT) OR Inadequate response to previous therapies defined as intolerance to ≥ 2 DMTs due to side effects prohibiting the chronic use of the DMT. * Expanded Disability Status Scale (EDSS) 0 to 5.5 Progressive forms of MS (primary-progressive multiple sclerosis (PPMS) and non-active secondary-progressive multiple sclerosis (naSPMS)): * Inadequate response to previous therapies is defined as evidence of disease progression within 12 months prior to screening despite standard of care therapy for naSPMS or despite ocrelizumab, where available, for PPMS * Absence of clinical relapses for at least 24 months * No evidence of Gadolinium enhancing (GadE+) on magnetic resonance imaging (MRI) brain at screening or baseline * EDSS of 3 to 6.5 who are ambulatory Inclusion Criteria for myasthenia gravis (MG): …