for people ages 18-60 (full criteria)
at San Francisco, California and other locations
study started
estimated completion
Principal Investigator
by Bruce Cree
Headshot of Bruce Cree
Bruce Cree



The purpose of this study is to evaluate the safety and tolerability of ATA188 as a monotherapy in Parts 1 and 2, to determine the recommended Part 2 dose (RP2D) of ATA188 as monotherapy in Part 1, and to evaluate the effect of ATA188 treatment on clinical disability, as assessed by confirmed Expanded Disability Status Scale (EDSS) improvement at 12 months in Part 2 in participants with progressive forms of multiple sclerosis (MS) (primary progressive multiple sclerosis [PPMS] and secondary progressive multiple sclerosis [SPMS]).

Official Title

A Phase 1/2, Two-part, Open-label Dose-escalation and Double-blind, Placebo-controlled Dose-expansion Study With an Open-label Extension to Evaluate the Safety and Efficacy of ATA188 in Subjects With Progressive Multiple Sclerosis


This is a multicenter, 2 part study in adult participants with progressive forms of MS (PPMS/SPMS) with an open-label, single-arm, sequential dose-escalation period (Part 1) and a double-blind, randomized, placebo-controlled dose-expansion period (Part 2) followed by open-label extension (OLE) period. Part 2 and the OLE have been initiated by the sponsor's discretion based on a review of data from the dose-escalation cohorts. This study will evaluate the safety and efficacy of ATA188 administered by intravenous (IV) infusion. ATA188 will be selected for each participant based on matching 2 or more human leukocyte antigen (HLA) alleles shared between ATA188 and the participant, at least 1 of which is a HLA-restricting allele. In Part 1, participants received 2 cycles of ATA188 and entered 12 months follow-up period after the last dose of ATA188. Participants who completed at least the first year of the dose-escalation period and were active in the study have entered the OLE period. In OLE period, participants will receive the same RP2D assigned to Part 2 participants at the time of the Part 1 participant's first dose in each year of the OLE. In OLE period, participants will receive 1 cycle of ATA188 treatment every 12 months (Q12M) for up to 4 years (ie, Years 2 to 5). Otherwise, end of study (EOS) visit will be conducted at 24 months after Cycle 1 Day 1. In Part 2, participants will be randomized in 1:1 ratio to receive ATA188 at the RP2D or matching placebo, stratified by progressive MS diagnosis (PPMS vs SPMS) and any prior exposure to anti-CD20 therapy (yes vs no). Initially 80 participants will be randomized to ATA188 or placebo. Randomization of additional participants into the study will be based on the results of the interim analysis. Participants will receive 2 cycles of ATA188 at the RP2D or matching placebo and will be followed for at least 12 months after the first dose of study drug (ie, Year 1). In second year (Year 2), participants who received placebo in Year 1 will receive 2 cycles of ATA188 at the RP2D assigned at randomization and participants who received ATA188 at the RP2D in Year 1 will receive 1 cycle of ATA188 (at the RP2D assigned at randomization) and 1 cycle of placebo to maintain the blind. Participants who complete Year 2 will enter in OLE period to receive ATA188 Q12M for up to 3 years (ie, Years 3 to 5) at the RP2D that was last selected by the sponsor for Part 2. The end of study visit will be scheduled at 5 years (60 months) after the first dose of study drug (ie, Cycle 1 Day 1). Part 1 of the study recruitment has completed, Part 2 continues to recruit participants.


Primary Progressive Multiple Sclerosis Secondary Progressive Multiple Sclerosis Multiple Sclerosis (MS) Epstein-Barr Virus (EBV) EBV-associated Multiple Sclerosis Inflammation Central Nervous System Autoimmune Disease Autoimmunity Demyelination Cell Therapy T-cell Allogeneic EBV viremia Off-the-shelf (T cells) Multiple Sclerosis Multiple Sclerosis, Chronic Progressive Sclerosis ATA188


You can join if…

Open to people ages 18-60

  • For Part 2: 18 to < 61 years of age
  • For Part 2: Current diagnosis of a progressive form of MS as defined by the 2017 Revised McDonald criteria
  • For Part 2: EDSS scores of 3.0 to 6.5
  • Positive EBV serology
  • For Part 1 (recruitment completed): 18 to < 66 years of age
  • For Part 1 (recruitment completed): History of progressive forms of MS as defined by the 2010 Revised McDonald criteria for the diagnosis of MS
  • For Part 1 (recruitment completed): EDSS scores of 3.0 to 7.0

You CAN'T join if...

  • Clinical relapse as follows: For Part 2: Documented clinical and/or radiological relapse for 2 years prior to screening, including gadolinium (Gd)-enhancing lesion(s) on any brain MRI scans available during this period (A participant will also be considered ineligible if any clinical and/or radiological relapse is reported between screening and the first dose of study drug.); For Part 1 (recruitment completed): Active clinical relapse between providing informed consent and the first dose of study drug
  • Concurrent serious uncontrolled or unresolved medical condition
  • Positive serology and/or nucleic acid testing (NAT) for human immunodeficiency virus (HIV), active hepatitis B virus (HBV) infection or carrier status for HBV, active hepatitis C virus (HCV) infection
  • For Part 1: Positive serology for syphilis or human T cell lymphotrophic virus I/II
  • Clinically significant abnormalities of full blood count, renal function, or hepatic function
  • Any contraindication to MRI and/or Gd, eg., any object that is reactive to strong static magnetic, pulsed-gradient fields including any metallic fragments or foreign body (eg, aneurysm clip[s], pacemakers, electronic implants, shunts)
  • Prior therapy with corticosteroids (within 2 weeks before Cycle 1 Day 1)
  • Prior therapy (30 days) B-cell depleting agent (eg, anti-CD20 agents such as ocrelizumab); participant must be progressing despite therapy to be eligible
  • Prior therapy (6 half-lives or 30 days, whichever is longer) with glatiramer acetate, interferon β, nuclear factor (erythroid-derived 2)-like 2 (Nrf2) activators (eg, dimethyl fumarate ), methotrexate, azathioprine, cyclosporine, fingolimod, natalizumab, teriflunomide, mitoxantrone, cyclophosphamide, any other immunosuppressant or cytotoxic therapy (other than steroids), antithymocyte globulin or similar anti-T cell antibody therapy, or any other investigational product for Parts 1 and 2, and cladribine for Part 1 and IV immunoglobin, plasmapheresis, Bruton's tyrosine kinase inhibitors, all sphingosine 1-phosphate receptor modulators for Part 2
  • Any previous treatment with alemtuzumab, ablative stem cell transplant, or EBV T-cell therapy for both parts and cladribine for Part 2
  • Unwilling to use protocol specified contraceptive methods
  • Women who are breastfeeding
  • Pregnancy


  • University of California San Francisco accepting new patients
    San Francisco California 94158 United States
  • Stanford University accepting new patients
    Palo Alto California 94304 United States

Lead Scientist at UCSF

  • Bruce Cree
    Bruce Cree, MD, PhD, MAS is a Professor of Clinical Neurology and is the George A. Zimmermann Endowed Professor in Multiple Sclerosis in the Department of Neurology at the University of California San Francisco. Dr. Cree completed his MD and PhD in Biochemistry at UCSF. His neurology residency training was at Columbia University.


accepting new patients
Start Date
Completion Date
Atara Biotherapeutics
Phase 1/2 Multiple Sclerosis Research Study
Study Type
Expecting 265 study participants
Last Updated