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CLN-978

Phase 1

Rheumatoid Arthritis (RA | Small molecule | Immunology |Cullinan Therapeutics, Inc.|Trials Updated: Oct 26, 2026

CLN-978 development status

Highest phase Phase 1
Registered trials 4 across 1 sponsor since May 2023

CLN-978 target and mechanism

Molecular targetCD19
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLEDBiomarker
Total Trials3
Total Enrollment97

FDA Designations

No designations recorded

CLN-978 clinical trials

CLN-978 · 3 trials · 6 indications

Phase 1 3
NCT07041099A Study of CLN-978, a Subcutaneously Administered CD19-directed T Cell Engager, in Subjects With Sjogren's DiseaseSjögren
RECRUITING36 Analytics
NCT06994143A Study of CLN-978, a Subcutaneously Administered CD19-directed T Cell Engager, in Subjects With Rheumatoid ArthritisRheumatoid Arthritis (RA
RECRUITING37 Analytics
NCT06613360A Study of CLN-978, a Subcutaneously Administered CD19-directed T Cell Engager, in Subjects With Systemic Lupus ErythematosusSLE
RECRUITING24 Analytics
PHASE1RECRUITING
A Study of CLN-978, a Subcutaneously Administered CD19-directed T Cell Engager, in Subjects With Sjogren's Disease
SjögrenUnlock trial analytics
PHASE1RECRUITING
A Study of CLN-978, a Subcutaneously Administered CD19-directed T Cell Engager, in Subjects With Rheumatoid Arthritis
Rheumatoid Arthritis (RAUnlock trial analytics
PHASE1RECRUITING
A Study of CLN-978, a Subcutaneously Administered CD19-directed T Cell Engager, in Subjects With Systemic Lupus Erythematosus
SLEUnlock trial analytics

Study Endpoints

Primary Endpoints

Safety and Tolerability
48 weeks

Incidence and severity of adverse events (AEs), serious AEs (SAEs), AEs of special interest (AESIs).

Incidence and severity of adverse events
48 wks

Incidence and severity of adverse events (AEs)/adverse events of special interest (AESIs)/serious adverse events (SAEs)

Secondary Endpoints

To evaluate the PK of CLN-978
48 weeks
Detection of anti-drug antibodies
48 weeks
Change from baseline in B lymphocyte cell numbers in peripheral blood
48 weeks
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part A Dose EscalationEXPERIMENTALPatients with Sjogren's Disease treated with CLN-978 in dose escalation cohorts
Part B Further Dose EvaluationEXPERIMENTALFurther evaluation of CLN-978 treatment of patients with Sjogren's Disease
Part A: Dose EscalationEXPERIMENTALPatients with RA treated with CLN-978 in dose escalation cohorts

Interventions

NameTypeDescription
CLN-978DRUGSpecified dose on specified days
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites14

Inclusion * Diagnosis of SjD at least 24 weeks prior to Screening Visit and meet the 2016 EULAR / ACR Classification Criteria for SjD at Screening. * Have active moderate to severe disease (i.e., ESSDAI ≥5) at Screening. * Laboratory parameters including the following: * Absolute lymphocyte coun...

Countries:United StatesFranceGermanyItalyAustraliaBulgariaGeorgiaMoldovaRomaniaSpain
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Recent Changes (Last 90 Days)

LOWOct 26, 2026NCT06613360lastUpdatePostDate: changed
LOWOct 26, 2026NCT06613360lastUpdatePostDate: changed
LOWOct 22, 2026NCT06613360lastUpdatePostDate: changed
LOWOct 22, 2026NCT06613360lastUpdatePostDate: changed
LOWOct 20, 2026NCT06994143lastUpdatePostDate: changed
LOWOct 20, 2026NCT06994143lastUpdatePostDate: changed
LOWAug 11, 2026NCT07041099lastUpdatePostDate: changed
LOWAug 11, 2026NCT07041099lastUpdatePostDate: changed

Frequently asked questions about CLN-978

What is CLN-978?

CLN-978 is an investigational subcutaneous CD19-directed T cell engager being developed by Cullinan Therapeutics for autoimmune and inflammatory diseases. It is in Phase 1 clinical development for rheumatoid arthritis, systemic lupus erythematosus, and Sjögren's disease. It is a small molecule that binds CD19, a protein target on B cells.

What is CLN-978 used for in rheumatoid arthritis?

CLN-978 is being studied in Phase 1 for rheumatoid arthritis, along with systemic lupus erythematosus and Sjögren's disease. The rheumatoid arthritis trial, NCT06994143, is recruiting adults 18 years and older in Germany and Italy. CLN-978 is investigational and has not been approved for any indication.

What does CLN-978 target?

CLN-978 targets CD19, a protein on the surface of B cells. It is designed as a CD19-directed T cell engager, given subcutaneously, that redirects T cells toward CD19-expressing cells. CD19 is the molecular target of the program, which Cullinan Therapeutics is developing in immunology.

Who makes CLN-978?

CLN-978 is developed by Cullinan Therapeutics, Inc., which trades on Nasdaq under the ticker CGEM. The company is running Phase 1 studies of the subcutaneous CD19-directed T cell engager in rheumatoid arthritis, systemic lupus erythematosus, and Sjögren's disease across sites in the United States and Europe.

What phase is CLN-978 in?

CLN-978 is in Phase 1 clinical development. All three of its studies, in rheumatoid arthritis, systemic lupus erythematosus, and Sjögren's disease, are currently recruiting participants. CLN-978 is investigational and has not been approved by the FDA for any indication.

What clinical trials is CLN-978 in?

CLN-978 is in three recruiting Phase 1 trials: NCT07041099 in Sjögren's disease across the United States, France, Germany, and Italy; NCT06994143 in rheumatoid arthritis in Germany and Italy; and NCT06613360 in systemic lupus erythematosus across the United States, Australia, and several European countries. All enroll adults 18 and older.