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CLN-619

Phase 1

Advanced Solid Tumor | Small molecule | Oncology |Cullinan Therapeutics, Inc.|Last Updated: Nov 24, 2025

Target and mechanism

Molecular targetMICA/B
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment440

FDA Designations

No designations recorded

Clinical trial landscape

CLN-619 · 2 trials · 3 indications

Phase 1 2
NCT06381141A Study of CLN-619 (Anti-MICA/MICB Antibody) in Patients With Relapsed and Refractory Multiple MyelomaMultiple Myeloma
ACTIVE NOT_RECRUITING30 Analytics
NCT05117476A Study of CLN-619 Alone and in Combination With Pembrolizumab in Advanced Solid TumorsAdvanced Solid Tumor
ACTIVE NOT_RECRUITING440 Analytics
PHASE1ACTIVE NOT_RECRUITING
A Study of CLN-619 (Anti-MICA/MICB Antibody) in Patients With Relapsed and Refractory Multiple Myeloma
Multiple MyelomaUnlock trial analytics
PHASE1ACTIVE NOT_RECRUITING
A Study of CLN-619 Alone and in Combination With Pembrolizumab in Advanced Solid Tumors
Advanced Solid TumorUnlock trial analytics

Study Endpoints

Primary Endpoints

Proportion of participants reporting Adverse Events (AEs) and Serious Adverse Events (SAEs)
baseline through 3-week treatment period

Incidence of AEs and SAEs using MedDRA

Changes in Eastern Cooperative Oncology Group (ECOG) performance
Up to 2 years

ECOG Scores are a functional scale ranging from 0 (Fully active, able to carry out all pre-disease activities without restrictions) to 5 (Death)

Incidence of Dose-Limiting toxicity (DLTs)
up to 2 years

Maximum Tolerated Dose (MTD) is reached if 2 or more patients experience a DLT at a dose level

Best Overall Response (BOR) per patient
up to 2 years

The best response defined by the International Myeloma Working Group (IMWG) criteria recorded throughout the study including unscheduled assessments

Overall Response Rate (ORR)
up to 2 years

The proportion of patients who achieve a partial response or better (e.g., Partial Response (PR), Very Good Partial Response (VGPR), Complete Response (CR) or stringent Complete Response (sCR), according to IMWG response criteria

Duration of Response (DoR)
up to 2 years

The time from the earliest date of documented response to the first documented disease progression or death, whichever occurs first.

Clinical Benefit Rate (CBR)
up to 2 years

The proportion of patients with a best overall response of CR, PR and stable disease (SD), according to IMWG response criteria

Progression Free Survival (PFS)
up to 2 years

The time from date of first dose until the earliest date of disease progression, or death from any cause, whichever occurs first.

Overall Survival (OS)
up to 2 years

Time from the date of first dose to date of death due to any cause.

Dose Escalation: TEAEs
24 Months

Number of treatment-emergent events (TEAEs) TEAE is defined as adverse events reported for the first time or worsening of a pre-existing event after the first dose of study drug.

Dose Expansion: Best Overall Response (BOR)
Every 6 weeks for the first 18 weeks and then every 9 weeks until disease progression; approximately 36 months

The percentage of patients having a CR or PR as determined by PI assessment of disease response per RECIST 1.1 on at least one scan.

Dose Expansion: Overall Response Rate (ORR)
Every 6 weeks for the first 18 weeks and then every 9 weeks until disease progression; approximately 36 months

The percentage of patients having a CR or PR as determined by PI assessment of disease response per RECIST 1.1.

Dose Expansion: Duration of Response (DoR)
Every 6 weeks for the first 18 weeks and then every 9 weeks until disease progression; approximately 36 months

The time from the earliest date of CR or PR until the earliest date of disease progression, as determined by PI assessment of disease response per RECIST 1.1 or death from any cause if occurring sooner than progression.

Dose Expansion: Disease Control Rate (DCR)
Every 6 weeks for the first 18 weeks and then every 9 weeks until disease progression; approximately 36 months

The percentage of participants having CR, PR, or SD as best on study response.

Dose Expansion: Overall Survival (OS)
Every 6 weeks for the first 18 weeks and then every 9 weeks until disease progression; approximately 36 months

Time from the initial date of treatment until death.

Dose Expansion: Clinical Benefit Rate (CBR)
Every 6 weeks for the first 18 weeks and then every 9 weeks until disease progression; approximately 36 months

The percentage of participants who achieve CR, PR or SD for a duration of 6 months as determined by PI assessment of disease response per RECIST 1.1.

Secondary Endpoints

All Cohorts: Cmax
Up to 2 years
All Cohorts: AUC
Up to 2 years
All Cohorts: Time to Maximum concentration
Up to 2 years
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Study Design & Arms

AllocationNA
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Part 1 Dose EscalationEXPERIMENTALCohorts of patients with R/R MM will be treated at ascending doses of CLN-619 using a standard 3+3 dose escalation design.
Module A Dose EscalationEXPERIMENTALPatients with advanced solid tumors enrolled in dose escalation cohorts treated with CLN-619
Module A Cohort ExpansionEXPERIMENTALPatients with select solid tumor types enrolled in expansion cohorts treated with CLN-619 at a dose selected from the Module A Escalation arm
Module B Combination Therapy Dose EscalationEXPERIMENTALPatients with advanced solid tumors enrolled in dose escalation cohorts treated with CLN-619 in combination with pembrolizumab
Module B Combination Therapy Cohort ExpansionEXPERIMENTALPatients with select tumor types enrolled in expansion cohorts treated with CLN-619 at a dose selected from the Module B Escalation arm, in combination with pembrolizumab
Module C Escalation and ExpansionEXPERIMENTALPatients with select tumor types taking CLN-619 in combination with chemotherapy
Module D Loading DoseEXPERIMENTALPatients with select tumor types taking a loading dose of CLN-619
Module E Safety Run-in and ExpansionEXPERIMENTALPatients with select NSCLC tumor types taking CLN-619 in combination with Dato-DXd

Interventions

NameTypeDescription
CLN-619DRUGAnti-MICA/MICB monoclonal antibody
PembrolizumabDRUGKeytruda
PaclitaxelDRUGTaxane
Carboplatin AUC 6DRUGPlatinum compound
pemetrexedDRUGantifolate
Datopotamab deruxtecan-dlnk (Dato-DXd)DRUGTROP-2 antibody-drug conjugate (ADC)
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites8

Inclusion Criteria: 1. Aged ≥ 18 years at the time of signing the ICF. 2. Willing and able to give written informed consent and adhere to protocol requirements. 3. Patient has a history of multiple myeloma with relapsed and refractory disease as defined by the protocol. 4. Patients must have measur...

Countries:United StatesAustraliaPolandSpain
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Competitive Landscape -Other Solid Tumors 9 trials (matched to "Advanced Solid Tumor")

Frequently asked questions about CLN-619

What is CLN-619 used for?

CLN-619 is an investigational small molecule being studied for advanced solid tumors, including non-small cell lung cancer (NSCLC), and for relapsed and refractory multiple myeloma. It is currently in Phase 1 clinical development and is not yet approved by the FDA.

What does CLN-619 target?

CLN-619 targets MICA/B, a protein involved in the immune response to tumors. By targeting MICA/B, the drug is designed to enhance the body's ability to fight cancer cells. This mechanism is being evaluated in clinical trials for advanced solid tumors and multiple myeloma.

Who makes CLN-619?

CLN-619 is being developed by Cullinan Therapeutics, Inc., a biopharmaceutical company traded on the stock exchange under the ticker symbol CGEM. The company is conducting clinical trials to evaluate the safety and efficacy of this investigational drug.

What phase is CLN-619 in?

CLN-619 is in Phase 1 clinical development. It is being studied in two active trials: one for advanced solid tumors and NSCLC, and another for relapsed and refractory multiple myeloma. The drug is investigational and has not received FDA approval.

What clinical trials is CLN-619 in?

CLN-619 is being evaluated in two Phase 1 trials. NCT05117476 studies CLN-619 alone and in combination with pembrolizumab in advanced solid tumors, including NSCLC, with 440 participants across the US, Australia, Poland, and Spain. NCT06381141 studies CLN-619 in relapsed and refractory multiple myeloma with 30 participants in the US.

Is CLN-619 the same as an anti-MICA/MICB antibody?

CLN-619 is described as an anti-MICA/MICB antibody in the clinical trial for multiple myeloma. It targets MICA/B proteins. The drug is being investigated for its potential to treat advanced solid tumors and multiple myeloma, but it is not yet approved for any indication.