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SRK-181

Phase 1

Cancer | Monoclonal antibody | Oncology |Scholar Rock Holding Corporation|Last Updated: Apr 29, 2025

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
CONTROLLEDBiomarker
Total Trials1
Total Enrollment112
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT04291079SRK-181 Alone or in Combination With Anti-PD-(L)1 Antibody Therapy in Patients With Locally Advanced or Metastatic Solid Tumors (DRAGON)PHASE1 COMPLETED 112Apr 23, 2020Apr 14, 2025Apr 29, 202522 United States, South Korea
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Study Endpoints
Primary Endpoints
Safety and tolerability of single agent SRK-181
The first 21 days of study treatment

Dose limiting toxicities (DLTs), as assessed by the Investigator, but not including toxicities clearly related to disease progression or intercurrent illness

Safety and tolerability of SRK-181 in combination with anti-PD-(L)1 antibody therapy
The first 21 days of study treatment

Dose limiting toxicities (DLTs), as assessed by the Investigator, but not including toxicities clearly related to disease progression or intercurrent illness

Secondary Endpoints
PK of SRK-181 alone and in combination with anti-PD-(L)1 antibody therapy
Cycle 1 and Cycle 3 (each cycle is 21 days)
Anti-tumor activity of SRK-181, alone or in combination wit anti-PD-(L)1 antibody therapy as potential indicators of clinical response
6 months
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
Part A1: Dose EscalationEXPERIMENTALPart A1 determined the maximum tolerated dose (MTD) or maximum administered dose (MAD) of SRK-181 as a single agent and the recommended Phase 2 dose (RP2D) of SRK-181 as a single-agent.
Part A2: Dose EscalationEXPERIMENTALPart A2 determined the MTD or MAD of SRK-181 in combination with anti-PD-(L)1 antibody therapy and the RP2D of SRK-181 in combination with anti-PD-(L)1 antibody therapy for use in Part B.
Part B: Dose ExpansionEXPERIMENTALIn Part B, parallel cohorts of patients with Non-Small Cell Lung Cancer (NSCLC), Urothelial Carcinoma (UC), Cutaneous Melanoma (MEL), Clear Cell Renal Cell Carcinoma (ccRCC), Head and Neck Squamous Cell Carcinoma (HNSCC), or other advanced or metastatic solid tumor type that is not NSCLC, UC, MEL, or ccRCC were enrolled to confirm the tolerability of the RP2D of SRK-181 (determined in Part A2) and to evaluate the anti-tumor activity of SRK-181 in combination with an anti-PD-(L)1 antibody therapy.
Long Term Extension Phase (LTEP)EXPERIMENTALPatients may continue treatment in a LTEP: * Part A1: Patients may continue treatment with SRK-181 as a single agent at the RP2D in the LTEP following 3 cycles of treatment with SRK-181 as a single agent in Part A1. * Part A2: Patients may continue treatment with SRK-181 at the RP2D in combination with anti-PD-(L)1 antibody therapy in the LTEP following 3 cycles of treatment with SRK-181 in combination with anti-PD-(L)1 antibody therapy in Part A2. * Part B: Patients may continue treatment with SRK-181 in combination with anti-PD-(L)1 antibody therapy following 9 cycles of treatment with SRK-181 in combination with anti-PD-(L)1 antibody therapy in Part B
Interventions
NameTypeDescription
SRK-181BIOLOGICALanti-latent TGFβ1 monoclonal antibody
anti-PD-(L)1 antibody therapyBIOLOGICALapproved anti-PD-(L)1 antibody therapy for each tumor type
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites22

Key Inclusion Criteria: * Patient has a histologically documented solid tumor that is metastatic or locally advanced, for which SoC therapy does not exist, has failed in the patient, or is not tolerated by the patient, or for which the patient has been assessed by the Investigator as not being a su...

Countries:United StatesSouth Korea
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