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FS120 Phase 1/1b Study in Patients With Advanced Malignancies

A Phase 1/1b Open-Label Study to Evaluate the Safety and Antitumor Activity of FS120, an OX40/CD137 Bispecific Antibody, Alone and in Combination With Pembrolizumab, in Subjects With Advanced Malignancies

Status
Active, not recruiting
Phases
Phase 1
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT04648202
Enrollment
82
Registered
2020-12-01
Start date
2020-11-18
Completion date
2026-03-01
Last updated
2025-06-27

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

Conditions

Advanced Cancer, Metastatic Cancer

Keywords

Immuno-oncology, Bispecific antibody, Dose escalation, Cohort expansion, OX40, CD137 (4-1BB), invoX, Pembrolizumab, PD-1

Brief summary

This is a Phase 1/1b, multicenter, open label study to evaluate the Safety and Antitumor Activity of FS120, an OX40/CD137 Bispecific Antibody, Alone and in Combination with Pembrolizumab, in Subjects with Advanced Malignancies

Interventions

DRUGFS120

Dosing of participants with FS120 or the combination pembrolizumab will occur intravenously (IV), at a fixed dose in treatment cycles once every 4 weeks (Q4W) or once every 3 weeks (Q3W) until confirmed progressive disease (CPD)/immune-confirmed progressive disease (iCPD) or unacceptable toxicity.

Sponsors

Merck Sharp & Dohme LLC
CollaboratorINDUSTRY
invoX Pharma Limited
Lead SponsorINDUSTRY

Study design

Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE

Eligibility

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

Inclusion criteria

* Measurable disease * Eastern Cooperative Oncology Group Performance Status 0-1. * Highly effective contraception if risk of conception exists * A female subject is eligible if not pregnant, not breastfeeding, not a woman of childbearing potential (WOCBP) or is a WOCBP that uses highly effective contraception * Subjects with HIV who are healthy and how a low risk of acquired immunodeficiency syndrome related outcomes * For combination part: Subjects must have histologically confirmed locally advanced, unresectable or metastatic solid tumours where there is regulatory approval for use of pembrolizumab as a monotherapy agent

Exclusion criteria

* Prior systemic anticancer therapy within 28 days or 5- half-lives, whichever is shorter, before the first dose of study drug. * Prior therapy with any OX40 agonist, CD137 (4-1BB) agonist, CD40 agonist, GITR, or CD27 targeting therapy (single agent or combination). * Prior radiotherapy within 2 weeks of start of study treatment. * HIV infected participants with a history of Kaposi sarcoma and/or Multicentric Castleman Disease. * Uncontrolled central nervous system (CNS) metastases and/or carcinomatous meningitis, primary CNS tumours, or solid tumours with CNS metastases as the only measurable disease. * Prior history of any grade ≥3 immune-related AE (irAE) that has not improved to grade ≤1; any grade ≥3 irAE that resulted in discontinuation of treatment, significant (grade ≥3 NCI CTCAE Version 5.0) treatment-related cytokine release syndrome. * Use of immunosuppressive agents, hypersensitivity or intolerance to monoclonal antibodies or their excipients, persistent grade ≥1 NCI CTCAE Version 5 toxicity related to prior therapy or any condition that would significantly impair and/or prohibit the participant's participation in the study, as per the investigator's judgement. * Vaccination with a live vaccine within 30 days before first dose of study drug. * Participants with a known additional malignancy that is progressing or has required active treatment in the past 3 years. * Participants with severe hypersensitivity (≥Grade 3) to pembrolizumab and/or any of its excipients.

Design outcomes

Primary

MeasureTime frameDescription
Incidence, severity, and duration of adverse events (AEs), serious adverse events (SAEs) and dose limiting toxicities (DLTs)24 monthsSafety and tolerability will be evaluated by collection of AEs, SAEs and DLTs according to the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI CTCAE) Version 5.0.
Determination of a maximum tolerated dose (MTD) and/or recommended Phase 2 dose (RP2D)24 monthsToxicity will be evaluated according to the NCI CTCAE Version 5.0.

Countries

Spain, United States

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 14, 2026