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MCLA-158

Phase 1

Advanced/Metastatic Solid Tumors | Small molecule | Oncology |Merus N.V.|Last Updated: Jan 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
CONTROLLEDDMCBiomarker
Total Trials1
Total Enrollment523
FDA Designations
No designations recorded
Clinical Trials (1)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT03526835A Study of Bispecific Antibody MCLA-158 in Patients With Advanced Solid TumorsPHASE1 RECRUITING 523May 2, 2018Nov 1, 2027Jan 29, 202545 United States, Belgium +4
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Study Endpoints
Primary Endpoints
Escalation: Number of patients with Dose Limiting Toxicities (DLTs) during Cycle 1
4 weeks

Evaluation of the number and severity of participants with treatment related toxicities observed during the dose escalation.

Expansion (Single agent - randomized expansion in 2/3L Head and Neck cancer, and combination cohorts): Safety and tolerability: AEs and SAEs
6-12 months

Incidence, severity, and relationship of AEs and SAEs

Expansion (Single agent - randomized expansion in 2/3L Head and Neck cancer): Treatment discontinuations and dose modifications due to AEs
6-12 months

Treatment discontinuations due to AEs and dose modifications due to AEs

Expansion (single agent - randomized expansion in 2/3L Head and Neck cancer): Best overall response (BOR)
36 months

Evaluation of clinical benefit assessed by RECIST v1.1 determining Best overall response (BOR)

Expansion (Single agent - non-randomized, and combination cohorts): Objective response rate (ORR)
36 months

Evaluation of clinical benefit assessed by RECIST v1.1 determining objective response rate (ORR)

Expansion (single agent - randomized expansion in 2/3L Head and Neck cancer): exposure-safety relationship of petosemtamab administered at 1100 mg and 1500 mg: TEAEs
8 weeks

Incidence of TEAEs at Week 8

Secondary Endpoints
Escalation & Expansion: Duration of response (DOR)
36 months
Expansion: Progression Free Survival (PFS)
36 months
Expansion (mCRC combination cohorts): Progression Free Survival (PFS) rate at 4 months
4 months
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Study Design & Arms
AllocationNON_RANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
MCLA-158EXPERIMENTALIn Part 1, the dose escalation phase, patients with metastatic CRC will receive escalating doses of MCLA-158 (every 2 weeks) until MTD or RP2D is reached. Each Cycle is 28 days. Single agent treatment. In Part 2, the expansion phase, participants with metastatic CRC and certain other solid tumors will receive intravenous infusion of MCLA-158 at the recommended Phase II dose (RP2D) every 2 weeks, at Day 1 and Day 15. The duration of each treatment cycle is 28 days. In addition, in the expansion phase, one randomized cohort will evaluate 2 doses (1100 mg and 1500 mg) of MCLA-158 in head and neck squamous cell carcinoma patients.
MCLA-158 + PembrolizumabEXPERIMENTALMCLA-158 in combination with pembrolizumab will be explored first in head and neck squamous cell carcinoma patients eligible to receive pembrolizumab as first-line monotherapy.
MCLA-158 + FOLFIRI combination chemotherapyEXPERIMENTALMCLA-158 in combination with FOLFIRI will be explored in mCRC patients with up to 1 line of prior regimen.
MCLA-158 + FOLFOX combination chemotherapyEXPERIMENTALMCLA-158 in combination with FOLFOX will be explored in mCRC patients with up to 1 line of prior regimen.
Interventions
NameTypeDescription
MCLA-158DRUGfull-length IgG1 bispecific antibody targeting EGFR and LGR5
MCLA-158 + PembrolizumabCOMBINATION_PRODUCTMCLA-158 in combination with pembrolizumab will be explored first in HNSCC patients eligible to receive pembrolizumab as first-line monotherapy.
MCLA-158 + FOLFIRICOMBINATION_PRODUCTMCLA-158 in combination with FOLFIRI will be explored in mCRC patients with up to 1 line of prior regimen.
MCLA-158 + FOLFOXCOMBINATION_PRODUCTMCLA-158 in combination with FOLFOX will be explored in mCRC patients with up to 1 line of prior regimen.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo
Study Sites45

Inclusion Criteria: * Histologically or cytologically confirmed solid tumors with evidence of metastatic or locally advanced disease not amenable to standard therapy with curative intent. * A baseline fresh tumor sample (FFPE) from a metastatic or primary site (if safe/feasible). * Amenable for bio...

Countries:United StatesBelgiumFranceNetherlandsSpainUnited Kingdom
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Recent Changes (Last 90 Days)
LOWMay 26, 2026NCT03526835primaryCompletionDate: changed
LOWMay 24, 2026NCT03526835studyFirstPostDate: changed