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Investigation of Ubamatamab Combination Therapy in Adult Participants With Platinum-Resistant Ovarian Cancer

Multi-Arm Phase 2 Platform Study of Ubamatamab (REGN4018; MUC16×CD3 Bispecific Antibody) With or Without Additional Agents in Platinum-Resistant Ovarian Cancer

Status
Recruiting
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT06787612
Enrollment
220
Registered
2025-01-22
Start date
2025-05-28
Completion date
2028-10-30
Last updated
2026-04-02

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

Conditions

Ovarian Cancer, Fallopian Tube Cancer, Primary Peritoneal Cancer

Keywords

Platinum Resistance

Brief summary

This study is researching an experimental drug called ubamatamab, also referred to as "study drug". The study is focused on patients who have advanced ovarian cancer. The aim of the study is to see how safe, tolerable, and effective the study drug is on its own and in combination with other anti-cancer drugs (bevacizumab, cemiplimab, fianlimab and a standard chemotherapy drug, pegylated liposomal doxorubicin \[PLD\]), referred to as "combination drugs'. The study is looking at several other research questions, including: * What side effects may happen from taking the study drug and its experimental combinations * How much study drug and fianlimab is in the blood at different times * Whether the body makes antibodies against the study drug (which could make the drug less effective or could lead to side effects) and its combinations

Interventions

Administered per the protocol

DRUGBevacizumab

Administered per the protocol

DRUGCemiplimab

Administered per the protocol

DRUGFianlimab

Administered per the protocol

DRUGPLD

Administered per the protocol

DRUGSarilumab

Administered per the protocol

Sponsors

Regeneron Pharmaceuticals
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
NONE

Eligibility

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

Inclusion criteria

Key Inclusion Criteria: 1. Participants with histologically or cytologically confirmed diagnosis of advanced serous or endometrioid ovarian (regardless of the grade), primary peritoneal, or fallopian tube cancer (clear cell, mucinous, and carcinosarcoma are excluded) 2. Must have progression on prior therapy documented radiographically and must have at least 1 measurable lesion (not previously irradiated) that can be accurately measured by RECIST 1.1 3. Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1 4. Adequate organ and bone marrow function, as described in the protocol 5. Platinum-Resistant Ovarian Cancer, as described in the protocol Key

Exclusion criteria

1. Major surgical procedure or significant traumatic injury within 4 weeks prior to first dose of study intervention(s) 2. Documented allergic or acute hypersensitivity reaction attributed to antibody treatments or doxorubicin hydrochloride or components of study intervention(s) 3. Another malignancy that is progressing or requires active treatment, as described in the protocol 4. Untreated or active Central Nervous System (CNS) metastases, or carcinomatous meningitis, as described in the protocol 5. Uncontrolled infections including but not limited to human immunodeficiency virus, hepatitis B or hepatitis C infection, or diagnosis of immunodeficiency 6. Moderate to large or ascites, as described in the protocol 7. Bowel obstruction within last 3 months or current need for parenteral nutrition NOTE: Other protocol-defined inclusion/

Design outcomes

Primary

MeasureTime frame
Objective Response Rate (ORR) per Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 by investigator assessmentUp to 3 years

Secondary

MeasureTime frame
Cancer Antigen (CA) -125 response by Gynecologic Cancer Intergroup (GCIG) CriteriaUp to 3 years
Complete Response (CR) rate by RECIST 1.1Up to 3 years
Disease Control Rate (DCR) by RECIST 1.1Up to 3 years
Duration Of Response (DOR) by RECIST 1.1Up to 3 years
Progression-Free Survival (PFS) by RECIST 1.1Up to 3 years
Occurrence of Grade ≥ 2 Cytokine Release Syndrome (CRS) by Lee criteriaUp to 3 years
Treatment-Emergent Adverse Events (TEAEs) by Common Terminology Criteria for Adverse Events (CTCAE) v5.0Up to 3 years
TEAEs by Lee criteriaUp to 3 years
Concentration of ubamatamab in serumUp to 3 years
Concentration of fianlimab in serumUp to 3 years
Occurrence of Anti-Drug Antibodies (ADA) to ubamatamabUp to 3 years
Magnitude of ADA to ubamatamabUp to 3 years
Occurrence of ADA to fianlimabUp to 3 years
Magnitude of ADA to fianlimabUp to 3 years
Occurrence of ADA to cemiplimabUp to 3 years
Magnitude of ADA to cemiplimabUp to 3 years

Countries

Canada, South Korea, Taiwan, Turkey (Türkiye), United States

Contacts

CONTACTClinical Trials Administrator
clinicaltrials@regeneron.com844-734-6643
STUDY_DIRECTORClinical Trial Management

Regeneron Pharmaceuticals

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Apr 3, 2026