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REGN5668

Phase 1

Ovarian Cancer | Small molecule | Oncology |Regeneron Pharmaceuticals, Inc.|Last Updated: Aug 20, 2026

Target and mechanism

Molecular targetMUC16
Target classProtein
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

CONTROLLED
Total Trials1
Total Enrollment612

FDA Designations

No designations recorded

Clinical trial landscape

REGN5668 · 1 trial · 4 indications

Phase 1 1
NCT04590326A Study to Find Out How Safe REGN5668 is and How Well it Works In Adult Women When Given With Either Cemiplimab, or Cemiplimab + Fianlimab, or UbamatamabOvarian Cancer
RECRUITING612 Analytics
PHASE1RECRUITING
A Study to Find Out How Safe REGN5668 is and How Well it Works In Adult Women When Given With Either Cemiplimab, or Cemiplimab + Fianlimab, or Ubamatamab
Ovarian CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Incidence of Dose Limiting Toxicities (DLT)
42 days

Dose escalation phase, Module 1

Incidence of DLTs
21 days post combination administration

Dose escalation phase, Module 2

Incidence of Treatment-Emergent Adverse Events (TEAEs)
Through study completion, up to 5 years

Primary: Dose escalation phase Secondary: Dose expansion phase

Incidence of Serious Adverse Events (SAEs)
Through study completion, up to 5 years

Primary: Dose escalation phase Secondary: Dose expansion phase

Incidence of deaths
Through study completion, up to 5 years

Primary: Dose escalation phase Secondary: Dose expansion phase

Incidence of laboratory abnormalities (Grade 3 or higher per National Cancer Institute Common Terminology Criteria for Adverse Events [NCI-CTCAE] version 5.0 [v5.0])
Through study completion, up to 5 years

Primary: Dose escalation phase Secondary: Dose expansion phase

Concentrations of REGN5668 in serum when dosed alone and in combination with cemiplimab or ubamatamab
Through study completion, up to 5 years

Primary: Dose escalation phase

Objective Response Rate (ORR) defined by Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 (Eisenhauer, 2009) of REGN5668 in combination with cemiplimab, cemiplimab + fianlimab, or ubamatamab (separately by cohort and combination)
Through study completion, up to 5 years

Primary: Dose expansion phase

Secondary Endpoints

ORR based on RECIST 1.1
Through study completion, up to 5 years
Best Overall Response (BOR) based on RECIST 1.1
Through study completion, up to 5 years
Duration Of Response (DOR) based on RECIST 1.1
Through study completion, up to 5 years
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Study Design & Arms

AllocationNON_RANDOMIZED
MaskingNONE
ModelSEQUENTIAL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Module 1EXPERIMENTALREGN5668 in combination with cemiplimab, or cemiplimab + fianlimab
Module 2EXPERIMENTALREGN5668 and ubamatamab

Interventions

NameTypeDescription
REGN5668DRUGAdminister per the protocol
CemiplimabDRUGAdminister per the protocol
UbamatamabDRUGAdminister per the protocol
SarilumabDRUGAdminister per the protocol
Cemiplimab + Fianlimab [Fixed Dose Combination (FDC)]DRUGAdminister per the protocol
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Eligibility Criteria

Age Range18 Years to N/A
SexFEMALE
Healthy VolunteersNo
Study Sites28

Key Inclusion Criteria: 1. Ovarian Cancer Cohorts Only: Has histologically or cytologically confirmed diagnosis of advanced epithelial ovarian cancer (except carcinosarcoma), primary peritoneal, or fallopian tube cancer that has received at least 1 line of platinum-based systemic therapy as defined...

Countries:United StatesBelgiumBrazilFranceSpain
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Competitive Landscape -Ovarian Cancer 175 trials

Top 20 of 58 competitors

CompanyTickerTrialsLead PhaseDrugs
Merck & Co., Inc.MRK5PHASE3Pembrolizumab, Paclitaxel, Bevacizumab, Docetaxel
AstraZeneca PLCAZN19PHASE3Olaparib
GSK plc Sponsored ADRGSK4PHASE3Niraparib
Eli Lilly and CompanyLLY8PHASE3Sofetabart Mipitecan, Paclitaxel, Topotecan, Gemcitabine, Pegylated liposomal doxorubicin
AbbVie, Inc.ABBV13PHASE3Mirvetuximab soravtansine plus Bevacizumab, Bevacizumab
Bristol-Myers Squibb CompanyBMY4PHASE3Rucaparib, Nivolumab
Genmab A/S Sponsored ADRGMAB5PHASE3Rina-S, Paclitaxel, Topotecan, Pegylated liposomal doxorubicin, Gemcitabine
Pfizer Inc.PFE4PHASE3Avelumab, Lorlatanib, Talazoparib, Pemetrexed, Axitinib
Corcept Therapeutics Incorporated.CORT2PHASE3Nab-paclitaxel/m^2, Relacorilant once daily
Verastem, Inc.VSTM4PHASE3avutometinib, Defactinib, Pegylated liposomal doxorubicin, Paclitaxel, Letrozole
Zentalis Pharmaceuticals, Inc.ZNTL3PHASE3Azenosertib
Imunon, Inc.IMNN3PHASE3IMNN-001, Paclitaxel, Carboplatin, Olaparib, Niraparib
Incyte CorporationINCY2PHASE3INCB123667
Genelux Corp.GNLX1PHASE3olvimulogene nanivacirepvec, Platinum chemotherapy: carboplatin or cisplatin, Non-platinum chemotherapy: Physician's Choice of gemcitabine, taxane or pegylated liposomal doxorubicin, Bevacizumab
Regeneron Pharmaceuticals, Inc.REGN4PHASE2Ubamatamab, Bevacizumab, Cemiplimab, Fianlimab, PLD
Novartis AG Sponsored ADRNVS4PHASE2Dabrafenib, Trametinib
BeOne Medicines Ltd. Sponsored ADRONC2PHASE3Pamiparib
IQVIA Holdings IncIQV1PHASE3Oregovomab, Paclitaxel, Carboplatin
Xencor, Inc.XNCR3PHASE2vudalimab
Exelixis, Inc.EXEL2PHASE2Cabozantinib
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Recent Changes (Last 90 Days)

LOWAug 20, 2026NCT04590326lastUpdatePostDate: changed
LOWAug 20, 2026NCT04590326lastUpdatePostDate: changed

Frequently asked questions about REGN5668

What is REGN5668 used for in ovarian cancer?

REGN5668 is an investigational small molecule being studied for the treatment of ovarian cancer. It is also being evaluated in related conditions including fallopian tube cancer, primary peritoneal cancer, and endometrial cancer. The drug is currently in Phase 1 clinical development and is not yet approved by regulatory authorities.

What does REGN5668 target?

REGN5668 targets MUC16, a protein that is often overexpressed in ovarian cancer cells. By binding to MUC16, the drug is designed to interfere with tumor growth. This mechanism is being investigated in a Phase 1 clinical trial to assess its safety and efficacy in adult women with certain gynecologic cancers.

Who makes REGN5668?

REGN5668 is being developed by Regeneron Pharmaceuticals, Inc., a biopharmaceutical company traded on the Nasdaq under the ticker symbol REGN. The company is conducting clinical research to evaluate the drug's safety and effectiveness in treating ovarian cancer and related gynecologic malignancies.

What phase is REGN5668 in?

REGN5668 is currently in Phase 1 clinical development. It is an investigational drug, meaning it has not been approved by the FDA or other regulatory agencies. The ongoing Phase 1 trial is recruiting participants to evaluate the drug's safety, tolerability, and preliminary efficacy in adult women with ovarian cancer and other specified conditions.

What clinical trials is REGN5668 in?

REGN5668 is being studied in a single Phase 1 clinical trial registered as NCT04590326. This open-label, controlled study is recruiting 612 adult women with ovarian cancer, fallopian tube cancer, primary peritoneal cancer, or endometrial cancer. The trial is being conducted in the United States, Belgium, Brazil, France, and Spain.

Is REGN5668 being tested in combination with other drugs?

Yes, REGN5668 is being studied in combination with other investigational therapies. The Phase 1 trial NCT04590326 evaluates REGN5668 when given with either cemiplimab, cemiplimab plus fianlimab, or ubamatamab. The study aims to determine the safety and effectiveness of these combination regimens in adult women with certain gynecologic cancers.