Study of REGN4018 (Ubamatamab) Administered Alone or in Combination With Cemiplimab in Adult Patients With Recurrent Ovarian Cancer or Other Recurrent Mucin-16 Expressing (MUC16+) Cancers

Phase 1

Recruiting

• Conditions: Recurrent Ovarian Cancer; Recurrent Fallopian Tube Cancer; Recurrent Primary Peritoneal Cancer; Recurrent Endometrial Cancer; Endometrial Cancer; Low-grade Serous Ovarian Cancer
• Interventions: Drug: Ubamatamab; Drug: Sarilumab; Drug: Cemiplimab; Drug: Tocilizumab

• Registration Number: NCT03564340
• Lead Sponsor: Regeneron Pharmaceuticals

Brief Summary

The main purpose of this study is to:

* Learn about the safety of ubamatamab and to find out what dose of ubamatamab can be given alone or with cemiplimab to patients with ovarian cancer or cancer of the uterus

* The study will also look at the levels of ubamatamab and/or cemiplimab in the body and measure how well the body can remove the study drug(s). This is called pharmacokinetics

* The study will also look at any signs that ubamatamab alone or with cemiplimab can treat recurrent advanced ovarian cancer or cancer of the uterus

* To find out how safe and tolerable pretreatment is in combination with ubamatamab and to see how well it works to prevent or minimize Cytokine Release Syndrome (CRS)

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2018-05-17
• Study Start: 2018-05-21
• Study First Submitted QC: 2018-06-08
• Study First Posted: 2018-06-20
• Status Verified: 2025-07
• Last Update Submitted: 2025-07-21
• Last Update Posted: 2025-07-25
• Primary Completion: 2026-02-01
• Study Completion: 2027-01-31

Recruitment & Eligibility

• Status: RECRUITING
• Sex: Female
• Target Recruitment: 890

Inclusion Criteria

1. Ovarian Cancer Cohorts Only: Patients with histologically or cytologically confirmed diagnosis of advanced, epithelial ovarian cancer (except carcinosarcoma), primary peritoneal, or fallopian tube cancer who have all of the following:

   1. serum CA-125 level ≥2 x upper limit of normal (ULN) (in screening, not required for low-grade serous carcinoma)
   2. has received at least 1 line of platinum-containing therapy or must be platinum-intolerant (applicable for dose escalation and non-randomized dose expansion cohorts)
   3. documented relapse or progression on or after the most recent line of therapy
   4. no standard therapy options likely to convey clinical benefit

2. Adequate organ and bone marrow function as defined in the protocol

3. Life expectancy of at least 3 months

4. Randomized phase 2 expansion cohort (Ovarian Cancer only): Platinum-resistant ovarian cancer patients who have had 2 to 4 lines of platinum-based therapy as defined in the protocol.

5. Endometrial Cancer Cohorts Only: histologically confirmed endometrial cancer that has progressed or recurrent after prior anti-Programmed Cell Death Ligand 1 (PD-1) therapy and platinum-based chemotherapy:

   1. MUC16 positivity of tumor cells ≥25% by immunohistochemistry (IHC), as defined in the protocol
   2. 1-4 prior lines of systemic therapy, as described in the protocol

Key

Exclusion Criteria

1. Prior treatment with anti-Programmed Cell Death (PD-1)/PD-L1 therapy, as described in the protocol
2. Ovarian Cancer Expansion cohorts only: More than 4 prior lines of cytotoxic chemotherapy (does not apply to low-grade serous ovarian cancer cohort)
3. Prior treatment with a MUC16 - targeted therapy
4. Untreated or active primary brain tumor, central nervous system (CNS) metastases, or spinal cord compression, as described in the protocol
5. History and/or current cardiovascular disease, as defined in the protocol
6. Severe and/or uncontrolled hypertension at screening. Patients taking anti-hypertensive medication must be on a stable anti-hypertensive regimen

Note: Other protocol-defined Inclusion/Exclusion Criteria apply

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
Monotherapy	Ubamatamab	REGN4018 administration
Monotherapy	Sarilumab	REGN4018 administration
Monotherapy	Tocilizumab	REGN4018 administration
Combination Therapy	Ubamatamab	REGN4018 and cemiplimab administration
Combination Therapy	Cemiplimab	REGN4018 and cemiplimab administration

Primary Outcome Measures

Name	Time	Method
Number of participants with Dose-limiting toxicity (DLTs) for ubamatamab monotherapy	From Cycle 1, Day 1 up to 35 days	Dose Escalation Phase
Number of participants with DLTs for ubamatamab with cemiplimab	From Cycle 2, Day 1 up to 21 days	Dose Escalation Phase
Number of participants with Treatment-emergent adverse event (TEAE)s (including immune-related adverse events (imAEs)) for ubamatamab monotherapy	Up to 2 years	Dose Escalation Phase
Number of participants with TEAEs (including imAEs) for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation Phase
Number of participants with serious adverse events (SAEs) for ubamatamab monotherapy	Up to 2 years	Dose Escalation Phase
Number of participants with SAEs for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation Phase
Number of deaths for ubamatamab monotherapy	Up to 2 years	Dose Escalation Phase
Number of deaths for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation Phase
Number of participants with laboratory abnormalities (grade 3 or higher per Common Terminology Criteria for Adverse Events [CTCAE]) for ubamatamab monotherapy	Up to 2 years	Dose Escalation Phase
Number of participants with laboratory abnormalities (grade 3 or higher per CTCAE) for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation Phase
Concentration of ubamatamab in serum over time for ubamatamab monotherapy	Up to 2 years	Dose Escalation Phase
Concentration of ubamatamab in serum over time for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation Phase
Objective response rate (ORR) defined by Response Evaluation Criteria in Solid Tumors (RECIST 1.1) for ubamatamab monotherapy	Up to 2 years	Dose Expansion Phase
ORR defined by RECIST 1.1 for ubamatamab with cemiplimab	Up to 2 years	Dose Expansion Phase

Secondary Outcome Measures

Name	Time	Method
ORR based on RECIST 1.1 for ubamatamab monotherapy	Up to 2 years	Dose Escalation Phase
ORR based on RECIST 1.1 for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation Phase
Number of participants with TEAEs (including imAEs) for ubamatamab monotherapy	Up to 2 years	Dose Expansion Phase
Number of participants with TEAEs (including imAEs) for ubamatamab with cemiplimab	Up to 2 years	Dose Expansion Phase
Number of participants with SAEs for ubamatamab monotherapy	Up to 2 years	Dose Expansion Phase
Number of participants with SAEs for ubamatamab with cemiplimab	Up to 2 years	Dose Expansion Phase
Number of deaths for ubamatamab monotherapy	Up to 2 years	Dose Expansion Phase
Number of deaths for ubamatamab with cemiplimab	Up to 2 years	Dose Expansion Phase
Number of participants with laboratory abnormalities (grade 3 or higher per CTCAE) for ubamatamab monotherapy	Up to 2 years	Dose Expansion Phase
Number of participants with laboratory abnormalities (grade 3 or higher per CTCAE) for ubamatamab with cemiplimab	Up to 2 years	Dose Expansion Phase
Concentration of ubamatamab in serum over time for ubamatamab monotherapy	Up to 2 years	Dose Expansion Phase
Concentration of ubamatamab in serum over time for ubamatamab with cemiplimab	Up to 2 years	Dose Expansion Phase
Change from baseline in quality of life (QoL) as measured by the European Organisation for Research and Treatment of Cancer (EORTC) Quality of Life Questionnaire (QLQ)-C30 GHS/QoL score for ubamatamab monotherapy	Baseline up to 2 years	Dose Expansion Phase; The EORTC-QLQ-C30 is a 30-item subject self-report questionnaire composed of both multi-item and single scales, including global health status/quality of life, functional Scales (physical, role, emotional, cognitive, and social) , symptom scales (fatigue, nausea and vomiting, and pain), and 6 single items (dyspnea, insomnia, appetite loss, constipation, diarrhea, and financial difficulties). Participants rate items on a 4-point scale, with 1 as "not at all" and 4 as "very much."
Change from baseline in quality of life (QoL) as measured by the European Organisation for Research and Treatment of Cancer (EORTC) Quality of Life Questionnaire (QLQ)-C30 GHS/QoL score for ubamatamab with cemiplimab	Baseline up to 2 years	Dose Expansion Phase
Change from baseline in physical functioning as measured by the EORTC QLQ-C30 physical functioning score for ubamatamab monotherapy	Baseline up to 2 years	Dose Expansion Phase
Change from baseline in physical functioning as measured by the EORTC QLQ-C30 physical functioning score for ubamatamab with cemiplimab	Baseline up to 2 years	Dose Expansion Phase
Change from baseline in abdominal symptoms as measured by the Measure of Ovarian Symptoms and Treatment (MOST)-Abdominal index score for ubamatamab monotherapy	Baseline up to 2 years	Dose Expansion Phase excluding the Endometrial Cancer Cohort; The MOST-24 is a 24-item questionnaire used to measure the impact of chemotherapy on symptoms (21 items) and well-being (3 items). The expected questionnaire completion time is less than 5 minutes.; The prevalence of each MOST item at assessment time points can be summarized by providing the mean, standard deviation and proportions based on the MOST response format, a numeric rating scale with integers from zero to 10, with five verbal anchors: 'No trouble at all' (0), 'Mild' (1-3), 'Moderate' (4-6), 'Severe' (7-10), and 'Worst I can imagine' (10).
Change from baseline in abdominal symptoms as measured by the MOST-Abdominal index score for ubamatamab with cemiplimab	Baseline up to 2 years	Dose Expansion Phase Not applicable to Endometrial Cancer Cohort
Time to deterioration in GHS/QoL for ubamatamab monotherapy	Up to 2 years	Dose Expansion Phase
Time to deterioration in GHS/QoL for ubamatamab with cemiplimab	Up to 2 years	Dose Expansion Phase
Time to deterioration in physical functioning for ubamatamab monotherapy	Up to 2 years	Dose Expansion Phase
Time to deterioration in physical functioning for ubamatamab with cemiplimab	Up to 2 years	Dose Expansion Phase
Time to deterioration in abdominal symptoms for ubamatamab monotherapy	Up to 2 years	Dose Expansion Phase
Time to deterioration in abdominal symptoms for ubamatamab with cemiplimab	Up to 2 years	Dose Expansion Phase
Change from baseline in QoL as measured by EQ-5D for ubamatamab monotherapy	Baseline up to 2 years	Dose Expansion Phase
Change from baseline in QoL as measured by EQ-5D for ubamatamab with cemiplimab	Baseline up to 2 years	Dose Expansion Phase
ORR based on iRECIST for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
ORR based on iRECIST for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
Best overall response (BOR) based on RECIST 1.1 for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
BOR based on iRECIST for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
BOR based on RECIST 1.1 for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
BOR based on iRECIST for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
Duration of response (DOR) based on RECIST 1.1 for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
DOR based on iRECIST for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
DOR based on RECIST 1.1 for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
DOR based on iRECIST for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
Disease control rate based on RECIST 1.1 for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
Disease control rate based on iRECIST for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
Disease control rate based on RECIST 1.1 for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
Disease control rate based on iRECIST for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
Complete response (CR) rate based on RECIST 1.1 for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
CR rate based on iRECIST 1.1 for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
CR rate based on RECIST 1.1 for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
CR rate based on iRECIST 1.1 for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
Progression-free survival (PFS) based on RECIST 1.1 for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
PFS based on iRECIST for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
PFS based on RECIST 1.1 for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
PFS based on iRECIST for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
Cancer antigen-125 (CA-125) response for ubamatamab monotherapy	Up to 2 years	Dose Escalation and Dose Expansion Phases
CA-125 response for ubamatamab with cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases
Presence or absence of anti-drug antibodies against ubamatamab	Up to 2 years	Dose Escalation and Dose Expansion Phases
Presence or absence of anti-drug antibodies against cemiplimab	Up to 2 years	Dose Escalation and Dose Expansion Phases

Trial Locations

Locations (51)

University of Alabama_6th Ave; 🇺🇸 Birmingham, Alabama, United States

Massachusetts General Hospital; 🇺🇸 Boston, Massachusetts, United States

Dana Farber / Harvard Cancer Center; 🇺🇸 Boston, Massachusetts, United States

Mayo Clinic - Rochester; 🇺🇸 Rochester, Minnesota, United States

Roswell Park Cancer Institute; 🇺🇸 Buffalo, New York, United States

Columbia University Medical Center; 🇺🇸 New York, New York, United States

Memorial Sloan Kettering Cancer Center; 🇺🇸 New York, New York, United States

The Ohio State University Wexner Medical Center James Comprehensive Cancer Center; 🇺🇸 Hilliard, Ohio, United States

Stephenson Cancer Center; 🇺🇸 Oklahoma City, Oklahoma, United States

Sarah Cannon Research Institute; 🇺🇸 Nashville, Tennessee, United States

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