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Relapsing Multiple SclerosisPhase 1/2NCT06617793

An Open-label Study to Assess the Safety, Efficacy, and Cellular Kinetics of YTB323 in Relapsing Multiple Sclerosis

A Phase 1/2 study testing rapcabtagene autoleucel (YTB323) in people with Relapsing Multiple Sclerosis, run by Novartis Pharmaceuticals at 18 sites in 6 countries.

Active, not recruiting

Under way, not looking for participants. Everyone needed has enrolled. The study is still running.

Official record
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Trial summary

This is an open-label, multi-center, non-confirmatory study to assess the safety, efficacy, and cellular kinetics of YTB323 in approximately 28 participants with Relapsing Multiple Sclerosis (RMS) with breakthrough disease activity during previous treatment with a highly efficacious therapy (BD-HET). Read more about this study

Who is it for?
Ages 18 to 60 years
Conditions the study is for
Relapsing Multiple Sclerosis
What is being tested?
rapcabtagene autoleucel (YTB323)
Type of treatment
Injection or infusion
Could I receive a placebo?
No, everyone receives an active treatment
How many people
28 participants
Where
18 sitesin 6 countries
Study dates
24 Feb 2025to 7 Aug 2030
Phase
Phase 1/2
Are there results?
Not yet: the study is under way

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 60 years
  • All sexes
  • No healthy volunteers
  • Adult

Who may be able to join

  • Signed informed consent, and able to communicate well with the investigator and comply with the requirements of the study
  • Adequate renal, hepatic, cardiac, hematological, and pulmonary function
  • Male or female participants, ≥18 years to ≤60 years at screening, with diagnosis of RMS according to the 2017 McDonald diagnostic criteria Evidence of recent (i.e. within 1 year) breakthrough disease activity while at least 6 months on a highly efficacious therapy (any of the following): rituximab (Rituxan®), ocrelizumab (Ocrevus®), natalizumab (Tysabri®), ofatumumab (Kesimpta®), ublituximab (Briumvi®) or evidence of breakthrough disease activity within 2 years after the latest alemtuzumab infusion (Lemtrada®).
  • Evidence of breakthrough disease activity is defined as one or more of the following:
  • Confirmed Clinical MS relapse
  • Persistent radiological activity defined by one of the following:
Show all 12Show fewer
  • ≥2 T1 gadolinium-enhancing lesions on a single MRI scan
  • ≥1 T1 gadolinium-enhancing lesions on two or more separate MRI scans
  • ≥2 new T2 lesions compared to a previous scan within a period ≤1 year
  • Ambulatory patients (EDSS of 3 to 6 points, inclusive assessed outside of relapse)
  • Disease duration less than 15 years
  • Participants must receive or be current on all recommended vaccinations according to institutional, local, or global guidelines for immunocompromised patients at least 6-weeks prior to lymphodepletion

Who cannot join

  • Diagnosis of primary progressive multiple sclerosis (PPMS) according to the 2017 revision of the McDonald diagnostic criteria at screening
  • History of or current clinically significant CNS disease (e.g. stroke, traumatic brain or spinal injury, history or presence of myelopathy) or neurological disorders which may mimic MS or ICANS at screening
  • Evidence of clinically significant cardiovascular (such as but not limited to myocardial infarction, unstable ischemic heart disease, New York Heart Association (NYHA) Class III/IV left ventricular failure, arrhythmia and uncontrolled hypertension within 6 months prior to screening), neurological disorders other than MS (including seizure disorders even when well controlled), psychiatric, pulmonary (including, history of or active severe respiratory disease, including Chronic Obstructive Pulmonary Disease, interstitial lung disease or pulmonary fibrosis), renal, hepatic, endocrine, metabolic (e.g. severe hypoproteinemia due to nephrotic syndrome), hematological disorders or gastrointestinal disease that, in the investigator's opinion, would compromise the safety of the participant, interfere with the interpretation of the study results or otherwise preclude participation or protocol adherence of the participant, prior to screening
  • Have donated blood or experienced a loss of blood > 400 mL within 3 months prior screening, or longer if required by local regulations
  • Any prior stem cell therapy or organ transplantation or gene therapy
  • Any contraindications to LP, including but not limited to:
Show all 11Show fewer
  • Known or suspected structural abnormality of the lumbar spine that, in the opinion of the Investigator, may interfere with the performance of the LP, or increase the risk of the procedure for the participant
  • Presence of risk for increased or uncontrolled bleeding including, but not limited to, vascular abnormalities or neoplasms at or near the LP site, disorders of the coagulation cascade, platelet function, or platelet count
  • Participants on anticoagulants (e.g., warfarin) or antiplatelets [except for low-dose aspirin (100 mg/day or lower) and low-dose ibuprofen (600 mg/day or lower) which are allowable], are not eligible to participate
  • Participants not willing or able to take MRI scans as per protocol. Unable to undergo MRI due to for example claustrophobia, or presents absolute contraindications to MRI (e.g., metallic implants, metallic foreign bodies, pacemaker, defibrillator)
  • Other protocol-defined inclusion/exclusion criteria may apply

Trial locations and contacts

18 sites in 6 countries.

18 sites in 6 countries

Germany4 sites
  • Novartis Investigative Site

    Bochum, 44791

  • Novartis Investigative Site

    Essen, 45147

  • Novartis Investigative Site

    Mainz, 55131

  • Novartis Investigative Site

    Ulm, 89081

Other trials in Germany

Spain4 sites
  • Novartis Investigative Site

    Barcelona, 08035

  • Novartis Investigative Site

    Córdoba, 14004

  • Novartis Investigative Site

    Madrid, 28034

  • Novartis Investigative Site

    Valencia, 46026

Other trials in Spain

France3 sites
  • Novartis Investigative Site

    Montpellier, 34090

  • Novartis Investigative Site

    Nancy, 54035

  • Novartis Investigative Site

    Rennes, 35033

Other trials in France

Switzerland3 sites
  • Novartis Investigative Site

    Bern, 3010

  • Novartis Investigative Site

    Lausanne, 1011

  • Novartis Investigative Site

    Zurich, 8091

Other trials in Switzerland

Australia2 sites
  • Novartis Investigative Site

    Darlinghurst, New South Wales, 2010

  • Novartis Investigative Site

    Melbourne, Victoria, 3004

Other trials in Australia

Italy2 sites
  • Novartis Investigative Site

    Genova, GE, 16132

  • Novartis Investigative Site

    Milan, MI, 20132

Other trials in Italy

About this study

Official title: An Open-label, Multi-center, Phase 1/2 Study to Assess Safety, Efficacy, and Cellular Kinetics of YTB323 in Participants With Relapsing Multiple Sclerosis With Breakthrough Disease Activity During Previous Treatment With a Highly Efficacious Therapy

This is an open-label, multi-center, non-confirmatory study to assess the safety, efficacy, and cellular kinetics of YTB323 in approximately 28 participants with Relapsing Multiple Sclerosis (RMS) with breakthrough disease activity during previous treatment with a highly efficacious therapy (BD-HET). The study design utilizes an ascending single dose design consisting of 3 sentinel cohorts followed by an expansion cohort.

Read the detailed description

All participants in this study will receive YTB323. Both the participant and the study doctor will know the participant is getting YTB323. Participants will be given one dose of YTB323. Different groups of participants may receive a higher dose of YTB323, if proven to be safe for every participant at the lower dose. Participants are in this study for 2 years and will be followed for an additional 13 years in a long-term follow up study. The main question this trial is designed to answer: Is YTB323 treatment safe for participants with relapsing MS?

Being tested
rapcabtagene autoleucel (YTB323)
Keywords
Chimeric Antigen Receptor T cells, CAR-T, YTB323, Multiple Sclerosis, MS, Relapsing Multiple Sclerosis, RMS, breakthrough disease activity during previous treatment with a highly efficacious therapy, BD-HET
Medical subject headings
Multiple Sclerosis

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • rapcabtagene autoleucel (YTB323)Biological

    CAR-T cell suspension for intravenous infusion

Study groups in NCT06617793
Study groupRoleWhat they receive
YTB323 Cohort 1ExperimentalParticipants will receive one dose of YTB323
Receives: Biological: rapcabtagene autoleucel (YTB323)
YTB323 Cohort 2ExperimentalParticipants will receive one dose of YTB323
Receives: Biological: rapcabtagene autoleucel (YTB323)
YTB323 Cohort 3ExperimentalParticipants will receive one dose of YTB323
Receives: Biological: rapcabtagene autoleucel (YTB323)
YTB323 Cohort 4ExperimentalParticipants will receive one dose of YTB323
Receives: Biological: rapcabtagene autoleucel (YTB323)

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of participants with Adverse Events (AEs) and Serious Adverse Events (SAEs)

    Incidence of dose limiting toxicities (DLTs), AEs and SAEs, including changes in vital signs, electrocardiograms (ECGs), laboratory parameters, neurological status and magnetic resonance (MRI) of the brain and spinal cord qualifying and reported as AEs.

    Measured: Day 1 through Year 2

Secondary outcomes (15)
  1. Measure of Disability: Expanded Disability Status Scale (EDSS).

    EDSS is used to measure the change in disability level in participants using a scale from 0 to 10. The higher the score, the greater the degree of disability.

    Measured: Day 1 through Year 2

  2. Measure of Disability: Short Form Health Survey (SF-36 v2)

    The Short Form Health Survey (SF-36 v2) is a widely used and extensively studied instrument to measure health-related quality of life among healthy participants and participants with acute and chronic conditions. It consists of eight subscales that can be scored individually: Physical Functioning, Role-Physical, Bodily Pain, General Health, Vitality, Social Functioning, Role-Emotional, and Mental Health. Two overall summary scores, the Physical Component Summary (PCS) and the Mental Component Summary (MCS) also can be computed. The SF 36 has proven useful in monitoring general and specific populations, comparing the relative burden of different diseases, differentiating the health benefits produced by different treatments, and in screening individual participants.

    Measured: Day 1 through Year 2

  3. Measure of Disability: Timed 25 Foot Walk (T25FW)

    The T25FW is a mobility test based on a timed walk of 25 feet that is administered by a trained administrator. The participant is directed to walk the clearly marked 25-foot distance as quickly as possible. Longer completion time corresponds with decreased mobility.

    Measured: Day 1 through Year 2

  4. Measure of Disability: 9 Hole Peg Test (9HPT)

    The 9HPT is a finger dexterity test that is administered by a trained administrator. The participant is directed to put 9 pegs, one by one, onto and then off the holder board as quickly as possible starting with using only the dominant hand, and then repeated with the non-dominant hand. Longer completion times are associated with decreased finger dexterity.

    Measured: Day 1 through Year 2

  5. Measure of Disability: Symbol Digit Modalities Test (SDMT)

    The SDMT is a timed cognition test administered by a trained administrator. The test assesses sustained attention, processing speed, visual scanning, and motor speed to determine cognitive impairment. Participants are given a coding key which contains abstract symbols that correspond to specific numbers. Participants are timed how quickly and accurately they are able to substitute the symbols for the numbers and is scored by the number of correctly coded items.

    Measured: Day 1 through Year 2

  6. Measure of Disability: Fatigue Symptoms and Impacts Questionnaire - Relapsing Multiple Sclerosis (FSIQ-RMS)

    The FSIQ-RMS is a questionnaire to assess fatigue-related symptoms in patients with RMS. Participants will indicate the severity of fatigue experienced for each question that examines different aspects of fatigue.

    Measured: Day 1 through Year 2

  7. Number of new and enlarging T2 lesions and Gd-enhancing T1 Lesions

    Measured in the brain by Magnetic Residence Imaging (MRI)

    Measured: Day 1 through Year 2

  8. Plasma Pharmacokinetics (PK) of YTB323 - CMAX

    Measured by Cmax - The maximum plasma concentration of YTB323

    Measured: Day 1 through Year 2

  9. Plasma Pharmacokinetics (PK) of YTB323 - AUC

    Measured by AUC - Area under the curve of YTB323

    Measured: Day 1 through Year 2

  10. Plasma Pharmacokinetics (PK) of YTB323 - Tmax

    Measured by Tmax - Time to Reach the Maximum Concentration After Drug Administration of YTB323

    Measured: Day 1 through Year 2

  11. Plasma Pharmacokinetics (PK) of YTB323 - Clast

    Clast is defined as the Last observed (quantifiable) plasma concentration (Clast)

    Measured: Day 1 through Year 2

  12. Plasma Pharmacokinetics (PK) of YTB323 - Tlast

    Tlast is defined as Time of Last Measurable Concentration

    Measured: Day 1 through Year 2

  13. Safety data including dose limiting toxicities (DLTs), Adverse Events (AEs), and Serious Adverse Events (SAEs) from each dose level

    Safety data from each dose level will be used to assess safe dose-level(s) to be continued in phase 2 and later clinical studies

    Measured: Day 1 through Year 2

  14. Humoral Immunogenicity of YTB323

    Incidence and prevalence of pre-existing and treatment induced humoral immunogenicity of YTB323

    Measured: Day 1 through Year 2

  15. Cellular Immunogenicity of YTB323

    Incidence and prevalence of pre-existing and treatment induced cellular immunogenicity of YTB323

    Measured: Day 1 through Year 2

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted27 Sep 2024
  2. Study start24 Feb 2025
  3. Primary completion7 Aug 2030 (estimated)
  4. Study completion7 Aug 2030 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1/2
Primary purpose
Treatment
Allocation
Non-randomised
Intervention model
Single group
Masking
None (open label)
Enrolment
28 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06617793
Sponsor's protocol ID
CYTB323N12101
Other IDs
2024-512714-18
Status last verified
Aug 2026
First submitted
26 Sep 2024
Last updated
2 Sep 2026
Results posted
No
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
No
Individual data sharing
Yes: Novartis is committed to sharing with qualified external researchers, access to patient-level data and supporting clinical documents from eligible studies. These requests are reviewed and approved by an independent expert panel on the basis of scientific merit. All data provided is anonymized to respect the privacy of patients who have participated in the trial in line with applicable laws and regulations. This trial data is currently available according to the process described on www.clinicalstudydatarequest.com

Questions about this trial

What is this clinical trial studying?

A Phase 1/2 study testing rapcabtagene autoleucel (YTB323) in people with Relapsing Multiple Sclerosis, run by Novartis Pharmaceuticals at 18 sites in 6 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 12 inclusion and 11 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: under way, not looking for participants, as of the sponsor's last update on 2 Sep 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 18 sites in Germany, Spain, France, Switzerland, Australia and 1 more country. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this combined phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

This study is still under way. Results are not available in the source record yet.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of participants with Adverse Events (AEs) and Serious Adverse Events (SAEs) (time frame: Day 1 through Year 2). It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 2 Sep 2026; AzTrials last refreshed its copy on 6 Nov 2026.

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