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Clinical Study of Fianlimab in Combination With Cemiplimab Versus Pembrolizumab in Adolescent and Adult Patients With Previously Untreated Unresectable Locally Advanced or Metastatic Melanoma

A Phase 3 Trial of Fianlimab (REGN3767, Anti-LAG-3) + Cemiplimab Versus Pembrolizumab in Patients With Previously Untreated Unresectable Locally Advanced or Metastatic Melanoma

Status
Active, not recruiting
Phases
Phase 3
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT05352672
Enrollment
1546
Registered
2022-04-29
Start date
2022-07-14
Completion date
2031-09-16
Last updated
2026-04-22

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

Conditions

Melanoma

Keywords

Unresectable, Metastatic, Stage III, Stage IV, Anti-Lymphocyte-activation gene 3 Pathway (LAG-3)

Brief summary

This study is researching an experimental drug called REGN3767, also known as fianlimab (R3767), when combined with another medication called REGN2810, also known as cemiplimab (each individually called a "study drug" or called "study drugs" when combined). The study is focused on patients with a type of skin cancer known as melanoma. The aims of the study are to see how effective the combination of fianlimab and cemiplimab are in treating the melanoma skin cancer, in comparison with a medication, pembrolizumab, approved for the treatment of melanoma skin cancer in adults, and to observe any similarities, or differences, in how the study drugs work in adolescent participants compared with adult participants. The study is looking at several other research questions, including: * What side effects may happen from receiving the study drugs * How much study drug is in the blood at different times * Whether the body makes antibodies against the study drugs (which could make the drugs less effective or could lead to side effects). Antibodies are proteins that are naturally found in the blood stream that fight infections. * How administering the study drugs might improve quality of life

Interventions

DRUGFianlimab

Intravenous (IV) infusion

DRUGCemiplimab

IV infusion

DRUGPembrolizumab

IV infusion

DRUGPlacebo

IV infusion

Sponsors

Regeneron Pharmaceuticals
Lead SponsorINDUSTRY

Study design

Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
TREATMENT
Masking
QUADRUPLE (Subject, Caregiver, Investigator, Outcomes Assessor)

Eligibility

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

Inclusion criteria

Key Inclusion Criteria: 1. Age ≥12 years on the date of providing informed consent 2. Patients with histologically confirmed unresectable Stage III and Stage IV (metastatic) melanoma (AJCC, 8th revised edition) who have not received prior systemic therapy for advanced unresectable disease 1. Patients who received adjuvant and/or neoadjuvant systemic therapies are eligible if they did not have evidence of progression or recurrence of disease and/or discontinued due to occurrence of unmanageable imAEs ≥ grade 3 (with the exclusion of endocrinopathies which are fully controlled by hormone replacement) while on such therapies. Also, patients must have had a treatment-free and disease-free interval of \>6 months. Accrual of these patients is limited to approximately 10% of the total population enrolled. 2. Patients with acral and mucosal melanomas are eligible. Accrual will be limited to 10% of the total population. 3. Measurable disease per RECIST v1.1 1. Previously irradiated lesions can only be counted as target lesions if they have been demonstrated to progress and no other target lesion is available 2. Cutaneous lesions should be evaluated as non-target lesions 4. Performance status: 1. For adult patients: Eastern Cooperative Oncology Group (ECOG) performance status (PS) 0 or 1 2. For pediatric patients: Karnofsky performance status ≥70 (patients ≥16 years) or Lansky performance status ≥70 (patients ≤16 years) 5. Anticipated life expectancy of at least 3 months Key

Exclusion criteria

1. Uveal melanoma 2. Ongoing or recent (within 2 years) evidence of an autoimmune disease that required systemic treatment with immunosuppressive agents. The following are non-exclusionary: vitiligo, childhood asthma that has resolved, residual hypothyroidism that requires only hormone replacement, psoriasis not requiring systemic treatment. 3. Uncontrolled infection with human immunodeficiency virus (HIV), hepatitis B (HBV) or hepatitis C virus (HCV) infection; or diagnosis of immunodeficiency that is related to, or results in chronic infection 4. Unknown BRAF V600 mutation status as described in the protocol 5. Systemic immune suppression: 1. Use of immunosuppressive doses of corticosteroids (\>10mg of prednisone per day or equivalent) within 14 days of the first dose of study medication. Physiologic replacement doses are allowed up to and including 10mg of prednisone/day or equivalent. Inhaled or topical steroids are permitted, if they are not for treatment of an autoimmune disorder. 2. Other clinically relevant forms of systemic immune suppression 6. Treatment with other anti-cancer therapy including immuno- therapy, chemotherapy, major surgery or biological therapy within 21 days prior to the first dose of trial treatment. Adjuvant hormonotherapy used for breast cancer or other hormone-sensitive cancers in long term remission is allowed. 7. History or current evidence of significant (CTCAE Grade ≥2) local or systemic infection (e. g., cellulitis, pneumonia, septicemia) requiring systemic antibiotic treatment within 14 days prior to the first dose of trial medication. 8. Active or untreated brain metastases or spinal cord compression. Patients with leptomeningeal disease are excluded. Patients with known brain metastases are eligible if they: 1. Received radiotherapy or another appropriate standard therapy for the brain metastases, 2. Have neurologically returned to baseline (except for residual signs and symptoms related to the CNS treatment) for at least 14 days prior to enrollment 3. Did not require immunosuppressive doses of corticosteroids therapy (\>10mg of prednisone per day or equivalent) in the 14 days prior to enrollment 4. Are asymptomatic with a single untreated brain metastasis \<10 mm in size 9. Participants with a history of myocarditis. Note: Other protocol-defined Inclusion/

Design outcomes

Primary

MeasureTime frameDescription
Progression-free survival (PFS)Approximately 27 monthsPer Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 based on Blinded Independent Central Review (BICR)

Secondary

MeasureTime frameDescription
Overall survival (OS)Up to 96 months
Objective response rate (ORR)Up to 27 monthsPer Response Evaluation Criteria in Solid Tumors (RECIST) 1.1 based on Blinded Independent Central Review (BICR) or based on investigator assessment according to RECIST 1.1
Disease control rate (DCR)Up to 27 monthsPer RECIST 1.1 based on BICR or based on investigator assessment according to RECIST 1.1
Duration of response (DoR)Up to 27 monthsPer RECIST 1.1 via BICR or based on investigator assessment according to RECIST 1.1
PFSUp to 27 monthsBased on investigator assessment according to RECIST 1.1
Incidence of Adverse Events (AEs)Up to 90 days post last dose, approximately 6 yearsIncluding treatment emergent adverse events (TEAEs), serious adverse events (SAEs), adverse events of special interest (AESIs), and/ or immune-mediated adverse events (imAEs)
Occurrence of interruption and discontinuation of study drug(s) due to AEsUp to 90 days post last dose, approximately 6 yearsIncluding TEAEs, AESIs, and/ or imAEs
TEAEs leading to deathUp to 6 years
Incidence of laboratory abnormalitiesUp to 90 days post last dose, approximately 6 yearsWill be graded using the current version of the National Cancer Institute Common Terminology Criteria for Adverse Events (NCI-CTCAE) grading system (version 5.0)
Concentrations of cemiplimab in serumUp to 90 days post last dose, approximately 6 years
Concentrations of fianlimab in serumUp to 90 days post last dose, approximately 6 years
Incidence of anti-drug antibodies (ADA) to fianlimab over timeUp to 30 days post last dose, approximately 6 years
Titer of anti-drug antibodies (ADA) to fianlimab over timeUp to 30 days post last dose, approximately 6 years
Incidence of ADA to cemiplimab over timeUp to 30 days post last dose, approximately 6 years
Titer of ADA to cemiplimab over timeUp to 30 days post last dose, approximately 6 years
Incidence of neutralizing antibodies (NAb) to fianlimab over timeUp to 30 days post last dose, approximately 6 years
Incidence of NAb to cemiplimab over timeUp to 30 days post last dose, approximately 6 years
Patient-reported outcomes (PROs) as measured by European Organization for Research and Treatment of Cancer Quality of Life Questionnaire C30 (EORTC QLQ-C30)Up to 90 days post last dose, approximately 6 yearsEORTC-QLQ-C30 is a 30-item participant self-report questionnaire composed of both multi-item and single scales, including a global health status/quality of life (GHS/QoL) scale. Participants rate items on a four-point scale, with 1 as "not at all" and 4 as "very much." A change of 5 - 10 points is considered a small change. A change of 10 - 20 points is considered a moderate change.
PROs as measured by EQ-5D-5LUp to 90 days post last dose, approximately 6 yearsThe EQ-5D-5L consists of EQ-5D descriptive system comprises five dimensions: mobility, self-care, usual activities, pain/discomfort and anxiety/depression. Each dimension has 5 levels: no problems, slight problems, moderate problems, severe problems and extreme problems. Overall scores range from 0 to 1, with low scores representing a higher level of dysfunction.
PROs as measured by Functional Assessment of Cancer Therapy melanoma (FACTM) (melanoma subscale only)Up to 90 days post last dose, approximately 6 yearsThe FACTM is a melanoma-specific quality of life questionnaire that is composed of items from the Functional Assessment of Cancer Therapy-General (FACT-G). The FACTM is scored on a 5 point Likert-scale: "Not at all", "A little bit", "Somewhat", "Quite a bit", and "Very much.". A Higher score represents higher Health Related Quality of Life (HRQoL).
PROs as measured by Patient Global Impression of Severity (PGIS)Up to 21 days post last dose, approximately 6 yearsThe PGIS is a single 1-item questionnaire designed to assess participant's overall impression of disease severity at a given point in time by using a 4-point Likert scale that ranges from (1) = "none (no symptoms)" to (4) = "severe".
PROs as measured by Patient Global Impression of Change (PGIC)Up to 21 days post last dose, approximately 6 yearsThe PGIC is a single-item questionnaire designed to assess the participant's overall sense of whether there has been a change since starting treatment as rated on a 5-point Likert scale anchored by (1) "much better" to (5) "much worse", with (4) = "no change"
Change in physical functioning per EORTC QLQ-C30Baseline to Week 25EORTC-QLQ-C30 is a 30-item subject self-report questionnaire composed of both multi-item and single scales, including a global health status/quality of life (GHS/QoL) scale. Participants rate items on a four-point scale, with 1 as "not at all" and 4 as "very much." A change of 5 - 10 points is considered a small change. A change of 10 - 20 points is considered a moderate change.
Change in role functioning per EORTC QLQ-C30Baseline to Week 25EORTC-QLQ-C30 is a 30-item subject self-report questionnaire composed of both multi-item and single scales, including a global health status/quality of life (GHS/QoL) scale. Participants rate items on a four-point scale, with 1 as "not at all" and 4 as "very much." A change of 5 - 10 points is considered a small change. A change of 10 - 20 points is considered a moderate change.
Change in global health status/quality of life (GHS/QoL) per EORTC QLQ-C30Baseline to Week 25Global Health Status/Quality of Life (GHS/Qol) Score (Items 29 and 30) using the European Organization for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (EORTC QLQ-C30). Participants rate items on a four-point scale, with 1 as "not at all" and 4 as "very much." A change of 5 - 10 points is considered a small change. A change of 10 - 20 points is considered a moderate change.
Change in GHS/QoL per EORTC QLQ-C30Baseline to end of study, approximately 6 yearsEORTC-QLQ-C30 is a 30-item subject self-report questionnaire composed of both multi-item and single scales, including a global health status/quality of life (GHS/QoL) scale. Participants rate items on a four-point scale, with 1 as "not at all" and 4 as "very much." A change of 5 - 10 points is considered a small change. A change of 10 - 20 points is considered a moderate change.

Countries

Argentina, Australia, Austria, Belgium, Brazil, Canada, Chile, Czechia, France, Georgia, Germany, Hungary, Ireland, Italy, Mexico, Netherlands, Peru, Poland, Romania, South Africa, Spain, Turkey (Türkiye), United Kingdom, United States

Contacts

STUDY_DIRECTORClinical Trial Management

Regeneron Pharmaceuticals

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Apr 23, 2026