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ABL103 in Combination With Pembrolizumab, With or Without Taxane in Advanced or Metastatic Solid Tumors

A Multicenter, Open-label, Phase 1b/2 Trial of ABL103, a Bispecific Antibody of B7-H4 and 4-1BB, in Combination With Pembrolizumab With/Without Taxane in Subjects With Selected, Progressive, Locally Advanced (Unresectable) or Metastatic Solid Tumors

Status
Recruiting
Phases
Phase 1Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT07158918
Enrollment
65
Registered
2025-09-08
Start date
2025-08-06
Completion date
2027-12-02
Last updated
2025-09-08

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Solid Tumors

Brief summary

This study is to assess the safety and antitumor activity of ABL103 plus pembrolizumab, with or without taxane, in advanced or metastatic solid tumors.

Interventions

DRUGABL103

IV infusion

DRUGTaxane

IV infusion

Sponsors

Merck Sharp & Dohme LLC
CollaboratorINDUSTRY
ABL Bio, Inc.
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
SEQUENTIAL
Primary purpose
TREATMENT
Masking
NONE

Intervention model description

Dose escalation and Dose expansion

Eligibility

Sex/Gender
ALL
Age
18 Years to No maximum
Healthy volunteers
No

Inclusion criteria

* Subject must understand and be willing to provide informed consent and be able to comply with the study procedures and restrictions. * Subjects must be ≥18 years of age on the day of signing the informed consent form (ICF). * Subject must have a histologically or cytologically confirmed locally advanced unresectable, or metastatic solid tumor. * Subject must be relapsed or be refractory to available standard therapy or they must be intolerant of available standard therapy. * Subject must meet Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1 assessed 7 days before the first administration of the study drug. * Subjects must be recovered from AEs from prior therapy to Grade 1 or the baseline grade more than 14 days prior to the first administration of the study drug, except alopecia or Grade 2 toxicities that are deemed stable or irreversible (e.g., peripheral neuropathy) * Subjects who have AEs due to previous anticancer therapies must have recovered to ≤Grade 1 or baseline. Subject with endocrine-related AEs who are adequately treated with hormone replacement or subjects who have ≤Grade 2 neuropathy are eligible. * Subjects must have adequate hematologic, renal, hepatic, and thyroid function at screening and within 7 days prior to the first administration of study drug. * Female subjects who are not surgically sterile or postmenopausal must agree to use a highly effective method of birth control (2 methods strongly recommended) during the study and for 6 months following the last dose of ABL103/pembrolizumab. * Female subjects of childbearing potential must have a negative serum pregnancy test at screening and within 7 days prior to Cycle 1 Day 1 (C1D1). * Male subjects with female partner(s) of childbearing potential must agree to use contraception and and must not donate sperm during the treatment period with ABL103 and taxane and for at least 6 months after the final administration of ABL103 and taxane. * Male subjects with a pregnant or breastfeeding partner(s) must agree to remain abstinent or use a condom throughout the study period, and for at least 6 months after the final administration of ABL103 and taxane, and during the partner's pregnancy or breastfeeding period. When using a male condom, the partner must also use an additional method of contraception acceptable for female subjects.

Exclusion criteria

* Subject has received prior anticancer monoclonal antibody treatment or investigational therapy (agent or device) for which the pharmacologic or toxicity profile is not expected to have resolved prior to the first administration of the study drug. A minimum of 28 days is generally recommended for agents with known delayed toxicities or prolonged biological activity, unless otherwise justified. * Subject has received prior radiotherapy within 2 weeks of the first administration of study drug, or has radiation-related toxicities, requiring corticosteroids. * Subject has received any prior immunotherapy and was discontinued from the treatment due to a Grade 3 or higher irAE (except endocrine disorders that can be treated with replacement therapy) or was discontinued from that treatment due to Grade 2 myocarditis or recurrent Grade 2 pneumonitis. * Subject has received radiation therapy to the lung that is \>30 Gy within 6 months of the first dose of study treatment. * Subject has risk factors for bowel obstruction or bowel perforation, including, but not limited to a history of acute diverticulitis, intra-abdominal abscess, and abdominal carcinomatosis. Subjects with ovarian cancer with a history of abdominal carcinomatosis can be enrolled.

Design outcomes

Primary

MeasureTime frame
Disease Control Rate (DCR)Up to approximately 30 months
Incidence of Treatment-Emergent Adverse Events (TEAEs), Treatment-Related AEs, Serious AEs (SAEs), and Infusion-Related Reactions (IRRs)From baseline through study completion, an average of 12 months
Recommended Dose for Expansion (RDE) DeterminationFrom baseline through study completion, an average of 12 months
Objective Response Rate (ORR)Up to approximately 30 months
Incidence of Dose-Limiting Toxicities (DLTs)Day 1 to Day 21 (Safety Lead-in Part 1) and Day 1 to Day 28 (Safety Lead-in Part 2)

Secondary

MeasureTime frame
Preliminary Disease Control Rate (DCR)Up to approximately 30 months
Incidence of Anti-Drug Antibodies (ADA)From baseline through study completion, an average of 12 months
Preliminary Objective Response Rate (ORR)Up to approximately 30 months

Countries

Australia, South Korea, United States

Contacts

Primary ContactDayoung Ok
dayoung.ok@ablbio.com+82-2-3456-7300

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026