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CLN-978

Phase 1

SLE | Small molecule | Immunology |Cullinan Therapeutics, Inc.|Last Updated: Jun 5, 2026

Target and mechanism

Molecular targetCD19
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment24

FDA Designations

No designations recorded

Clinical trial landscape

CLN-978 · 4 trials · 8 indications

Phase 1 4
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
NCT05879744A Study of CLN-978 in Patients With Relapsed or Refractory (R/R) B Cell Non-Hodgkin Lymphoma (B-NHL)NHL
ACTIVE NOT_RECRUITING90 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
PHASE1ACTIVE NOT_RECRUITING
A Study of CLN-978 in Patients With Relapsed or Refractory (R/R) B Cell Non-Hodgkin Lymphoma (B-NHL)
NHLUnlock 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)

Safety and tolerability of CLN-978 based on AEs, AESIs, and SAEs
24 months

Incidence and severity of adverse events (AEs)/adverse events of special interest (AESIs)/serious adverse events (SAEs); incidence of dose interruptions and delays

Define dose regimen for CLN-978
24 months

Dose-limiting Toxicities (DLTs)

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
Part B Dose ExpansionEXPERIMENTALPatients with R/R DLBCL, R/R FL and other R/R B-NHL treated with CLN-978 at a dose selected from the Part A Dose Escalation arm.

Interventions

NameTypeDescription
CLN-978DRUGSpecified dose on specified days
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites11

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 StatesFranceGermanyItalyAustraliaBulgariaGeorgiaMoldovaRomania
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Recent Changes (Last 90 Days)

LOWJun 5, 2026NCT06613360lastUpdatePostDate: changed
LOWJun 5, 2026NCT06613360lastUpdatePostDate: changed
LOWJun 5, 2026NCT06613360lastUpdatePostDate: changed
LOWJun 5, 2026NCT06613360lastUpdatePostDate: changed
LOWMay 26, 2026NCT06994143primaryCompletionDate: changed
LOWMay 26, 2026NCT07041099primaryCompletionDate: changed
LOWMay 26, 2026NCT06613360primaryCompletionDate: changed
LOWMay 26, 2026NCT05879744primaryCompletionDate: changed
LOWMay 24, 2026NCT07041099studyFirstPostDate: changed
LOWMay 24, 2026NCT06613360studyFirstPostDate: changed
LOWMay 24, 2026NCT06994143studyFirstPostDate: changed
LOWMay 24, 2026NCT05879744studyFirstPostDate: changed

Frequently asked questions about CLN-978

What is CLN-978 used for?

CLN-978 is an investigational small molecule being developed for relapsed or refractory B cell non-Hodgkin lymphoma (B-NHL) and for the autoimmune conditions systemic lupus erythematosus (SLE), rheumatoid arthritis (RA), and Sjogren's disease. It is a CD19-directed T cell engager administered subcutaneously.

What does CLN-978 target?

CLN-978 targets CD19, a protein found on B cells. As a CD19-directed T cell engager, it is designed to bring T cells into contact with CD19-expressing cells. This mechanism is being studied across both oncology and autoimmune indications.

Who makes CLN-978?

CLN-978 is being developed by Cullinan Therapeutics, Inc., a biopharmaceutical company traded on the NASDAQ under the ticker CGEM. The company is conducting Phase 1 clinical trials of CLN-978 in multiple indications.

What phase is CLN-978 in?

CLN-978 is in Phase 1 clinical development. It is an investigational drug and has not been approved by the FDA. Multiple Phase 1 trials are ongoing or active across different indications, including non-Hodgkin lymphoma, SLE, rheumatoid arthritis, and Sjogren's disease.

What clinical trials is CLN-978 in?

CLN-978 is being studied in four Phase 1 trials: NCT05879744 for relapsed or refractory B cell non-Hodgkin lymphoma, NCT06613360 for systemic lupus erythematosus, NCT06994143 for rheumatoid arthritis, and NCT07041099 for Sjogren's disease. The lymphoma trial is active but not recruiting, while the others are recruiting.

Is CLN-978 the same as a CD19-directed T cell engager?

Yes, CLN-978 is a CD19-directed T cell engager. It is designed to target CD19 on B cells and is administered subcutaneously. This mechanism is being evaluated in both oncology and autoimmune disease clinical trials.