A Study of Coformulated Favezelimab/Pembrolizumab (MK-4280A) Versus Standard of Care in Subjects With Previously Treated Metastatic PD-L1 Positive Colorectal Cancer (MK-4280A-007)-China Extension Study

Study Overview
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Brief Summary
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The purpose of this China extension study is to assess the safety and efficacy of coformulated favezelimab/pembrolizumab (MK-4280A) in adult Chinese participants with metastatic colorectal cancer. The study will also compare MK-4280A with the standard of care treatment of regorafenib and TAS-102 (trifluridine and tipiracil). The primary study hypothesis is that coformulated favezelimab/pembrolizumab (MK-4280A) is superior to standard of care with respect to overall survival.

Detailed Description
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The China extension study will include participants previously enrolled in China in the global study for MK-4280A-007 (NCT05064059) plus those enrolled during the China extension enrollment period. A total of approximately 94 Chinese participants will be enrolled.

Official Title
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A Phase 3 Study of MK-4280A (Coformulated Favezelimab [MK-4280] Plus Pembrolizumab [MK-3475]) Versus Standard of Care in Previously Treated Metastatic PD-L1 Positive Colorectal Cancer (KEYFORM-007)

Conditions
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Colorectal Cancer

Intervention / Treatment
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* Biological: favezelimab/pembrolizumab
* Drug: regorafenib
* Drug: TAS-102


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Has a histologically confirmed colorectal adenocarcinoma that is metastatic and unresectable. Has measurable disease per RECIST 1.1 as assessed by the local site investigator. Has been previously treated for the disease and radiographically progressed on or after or could not tolerate standard treatment. Submits an archival (≤ 5 years) or newly obtained tumor tissue sample or newly obtained tumor tissue sample that has not been previously irradiated. Has an Eastern Cooperative Oncology Group Performance Score (ECOG PS) of 0 to 1 within 10 days prior to first dose of study intervention. Has a life expectancy of at least 3 months, based on the investigator assessment. Has the ability to swallow and retain oral medication and not have any clinically significant gastrointestinal abnormalities that might alter absorption. Has adequate organ function. Exclusion Criteria: Has previously been found to have deficient mismatch repair/microsatellite instability-high (dMMR/MSI-H) tumor status. Has known active central nervous system (CNS) metastases and/or carcinomatous meningitis or leptomeningeal disease. Has a history of acute or chronic pancreatitis. Has neuromuscular disorders associated with an elevated creatine kinase (eg, inflammatory myopathies, muscular dystrophy, amyotrophic lateral sclerosis, spinal muscular atrophy) Has clinically significant cardiovascular disease within 12 months from first dose of study intervention, including New York Heart Association Class III or IV congestive heart failure, unstable angina, myocardial infarction, cerebral vascular accident, or cardiac arrhythmia associated with hemodynamic instability. Has urine protein greater than or equal to 1g/24h. A woman of childbearing potential who has a positive urine/serum pregnancy test within 24/72 hours prior to the first dose of study intervention. Has received prior therapy with an anti-programmed cell death 1 (PD-1), anti-programmed death ligand 1 (PD-L1), or anti-programmed cell death ligand 2 (PD-L2), anti-lymphocyte activation gene 3 (LAG-3) antibody, with a tyrosine kinase inhibitor (TKI; eg, lenvatinib) other than rapidly accelerated fibrosarcoma (RAF) inhibitors (binimetinib is permitted if combined with a RAF inhibitor), or with an agent directed to another stimulatory or coinhibitory T-cell receptor (eg, cytotoxic T-lymphocyte-associated protein 4, OX-40, cluster of differentiation [CD] 137). Has previously received regorafenib or TAS-102. Has received prior systemic anticancer therapy including investigational agents within 28 days before randomization. Has received prior radiotherapy within 2 weeks of start of study intervention. Participants must have recovered from all radiation-related toxicities, not require corticosteroids, and not have had radiation pneumonitis. A 1-week washout is permitted for palliative radiation (≤2 weeks of radiotherapy) to non-CNS disease. Has received a live or live-attenuated vaccine within 30 days before the first dose of study intervention. Has a known additional malignancy that is progressing or has required active treatment within the past 3 years. Has severe hypersensitivity (≥Grade 3) to pembrolizumab and/or any of its excipients. Has an active autoimmune disease that has required systemic treatment in past 2 years. Has a history of (noninfectious) pneumonitis/interstitial lung disease that required steroids or has current pneumonitis/interstitial lung disease. Has an active infection requiring systemic therapy (eg, tuberculosis, known viral or bacterial infections, etc.). Has a known history of human immunodeficiency virus (HIV) infection. Has known history of Hepatitis B or known active Hepatitis C virus infection. Has a history or current evidence of any condition, therapy, or laboratory abnormality that might confound the results of the study, interfere with the participant's participation for the full duration of the study, or is not in the best interest of the participant to participate, in the opinion of the treating investigator. Has had an allogenic tissue/solid organ transplant.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Favezelimab/Pembrolizumab<br>Participants will receive coformulated favezelimab/pembrolizumab (800 mg/200 mg) intravenously (IV) on Day 1, then every 3 weeks (Q3W), for up to 35 infusions. | Biological: favezelimab/pembrolizumab<br>* Coformulated favezelimab/pembrolizumab (800 mg/200 mg), IV infusion<br>* Other names: MK-4280A;|
| Active Comparator: Standard of Care (Regorafenib or TAS-102)<br>Participants will receive 160 mg regorafenib orally daily on Days 1-21 of each 28-day cycle. Participants will also receive 35 mg/m^2 TAS-102 orally twice daily on Days 1-5 and Days 8-12 of each 28-day treatment cycle. | Drug: regorafenib<br>* Oral<br>* Other names: REGONIX®;Drug: TAS-102<br>* Oral<br>* Other names: LONSURF®;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Overall Survival (OS) | OS is defined as the time from randomization to death due to any cause. | Up to approximately 26 months | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Progression-Free Survival (PFS) according per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST 1.1) as assessed by Blinded Independent Central Review (BICR) | PFS is defined as the time from randomization to the first documented disease progression per RECIST 1.1 by BICR or death due to any cause, whichever occurs first. | Up to approximately 19 months | 
| Objective Response Rate (ORR) per RECIST 1.1 as Assessed by BICR | The ORR is defined as the percentage of participants who achieve a confirmed complete response (CR) or partial response (PR) per RECIST 1.1 as assessed by BICR. | Up to approximately 19 months | 
| Duration of Response (DOR) per RECIST 1.1 as Assessed by BICR | For participants who demonstrate confirmed CR or PR, duration of response is defined as the time from the first documented evidence of CR or PR until disease progression or death due to any cause, whichever occurs first. | Up to approximately 19 months | 
| Number of Participants Who Experience at least One Adverse Event (AE) | An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. | Up to approximately 27 months | 
| Number of Participants Who Discontinue Study Treatment Due to an AE | An AE is any untoward medical occurrence in a clinical study participant, temporally associated with the use of study intervention, whether or not considered related to the study intervention. The number of participants who discontinue study treatment due to an AE will be reported. | Up to approximately 24 months | 
| Change from Baseline in European Organisation for Research and Treatment of Cancer Quality of Life Questionnaire-Core 30 (EORTC QLQ-C30) Global Health Status (Item 29) and Quality of Life (Item 30) Combined Score | The EORTC QLQ-C30 is a cancer specific health-related quality-of life (QoL) questionnaire. Participant responses to the questions regarding Global Health Status (GHS; How would you rate your overall health during the past week?) and Quality of Life (QoL; How would you rate your overall quality of life during the past week?) are scored on a 7-point scale (1= Very poor to 7=Excellent). Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. The change from baseline in GHS (EORTC QLQ-C30 Item 29) and QoL (EORTC QLQ-C30 Item 30) combined score will be presented. A higher score indicates a better outcome. | Baseline and up to approximately 25 months | 
| Change from Baseline in EORTC QLQ-C30 Physical Functioning (Items 1-5) Score | The EORTC QLQ-C30 is a cancer specific health-related quality-of life (QoL) questionnaire. Participant responses to 5 questions about their physical functioning (Items 1-5) are scored on a 4-point scale (1=Not at All to 4=Very Much). Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. Higher scores meant a better level of function. | Baseline and up to approximately 25 months | 
| Change from Baseline in EORTC QLQ-C30 Appetite Loss (Item 13) Score | The EORTC QLQ-C30 is a cancer specific health-related quality-of life (QoL) questionnaire, including a single-item scale score for appetite loss (QLQ-C30 Item 13). For this item, individual responses to the question Have you lacked appetite? are given on a 4-point scale (1=Not at all; 4=Very much). Scores are transformed to a range from 0-100, with a lower score indicating a better outcome. The change from baseline in the EORTC QLQ-C30 appetite loss (Item 13) scale score will be presented. | Baseline and up to approximately 25 months | 
| Change from Baseline in EORTC Quality of Life Questionnaire-Colorectal Cancer-Specific 29 Items (QLQ-CR29) Bloating (Item 37) Score | The EORTC QLQ-CR29 is a health-related quality-of life (QoL) questionnaire specific for colorectal cancer, including a single-item scale score for bloating (QLQ-CR29 Item 37). For this item, individual responses to the question Did you have a bloated feeling in your abdomen? are given on a 4-point scale (1=Not at all; 4=Very much). Scores are transformed to a range from 0-100, with a lower score indicating a better outcome. The change from baseline in the EORTC QLQ-CR29 bloating (Item 37) scale score will be presented. | Baseline and up to approximately 25 months | 
| Time to Deterioration (TTD) in EORTC QLQ-C30 GHS (Item 29) and QoL (Item 30) Combined Score | TTD is defined as the time from baseline to the first onset of a ≥10-point deterioration (decrease) from baseline in GHS (EORTC QLQ-C30 Item 29) & QoL combined score (EORTC QLQ-C30 Item 30). Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. The TTD, as assessed based on a ≥10-point negative change (decrease) from baseline in GHS and QoL combined score, will be presented. A longer TTD indicates a better outcome. | Baseline and up to approximately 25 months | 
| TTD in EORTC QLQ-C30 Physical Functioning (Items 1-5) Combined Score | TTD is defined as the time from baseline to the first onset of a ≥10-point deterioration (decrease) from baseline in physical functioning score (EORTC QLQ-C30 Items 1-5). Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. The TTD, as assessed based on a ≥10-point negative change (decrease) from baseline in GHS and QoL combined score, will be presented. A longer TTD indicates a better outcome. | Baseline and up to approximately 25 months | 
| TTD in in EORTC QLQ-C30 Appetite Loss (Item 13) Score | TTD is defined as the time from baseline to the first onset of a ≥10-point deterioration (decrease) from baseline in appetite loss score (EORTC QLQ-C30 Item 13). Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. The TTD, as assessed based on a ≥10-point negative change (decrease) from baseline in physical functioning score, will be presented. A longer TTD indicates a better outcome. | Baseline and up to approximately 25 months | 
| TTD in EORTC Quality of Life Questionnaire-Colorectal Cancer-Specific 29 Items (QLQ-CR29) Bloating (Item 37) Score | TTD is defined as the time from baseline to the first onset of a ≥10-point deterioration (decrease) from baseline in bloating score (QLQ-CR29 Item 37). Using linear transformation, raw scores are standardized, so that scores range from 0 to 100. The TTD, as assessed based on a ≥10-point negative change (decrease) from baseline in appetite loss score, will be presented. A longer TTD indicates a better outcome. | Baseline and up to approximately 25 months | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Programmed Cell Death-1 (PD1, PD-1),, Programmed Cell Death Receptor Ligand 1 (PDL1, PD-L1), Programmed Cell Death Receptor Ligand 2 (PDL2, PD-L2)