Vactosertib in Combination with Pembrolizumab in Metastatic Colorectal or Gastric Cancer

A Phase 1b/2a, Open-label, Multicenter Study to Assess the Safety, Tolerability, Pharmacokinetics, and Antitumor Activity of Vactosertib in Combination with Pembrolizumab in Patients with Metastatic or Locally Advanced Colorectal or Gastric Cancer/ Gastroesophageal Junction Adenocarcinoma

This is an open-label, multicenter study to assess the safety, tolerability, pharmacokinetics, and antitumor activity of vactosertib in combination with pembrolizumab in patients with metastatic or locally advanced colorectal or gastric/gastroesophageal junction adenocarcinoma

Study Overview

• Status: Completed
• Conditions: Metastatic Colorectal Cancer; Gastric Cancer; Gastroesophageal Junction Adenocarcinoma
• Intervention / Treatment: Drug: TEW-7197

Detailed Description

This is phase 1b/2a, open label, multi-center study to assess safety, tolerability, pharmacokinetics and anti-tumor activity of vactosertib in combination with pembrolizumab in patients with mCRC including CMS4 or diffuse GC/GEJC with two phases (Dose Finding Phase and Dose Expansion Phase). At screening, CMS4 will be classified by an experienced pathologist in the central lab that will examine the histology of primary surgical tissues. Approximately, 67 total patients are expected to be enrolled in this study. The first phase of the study, the Dose Finding Phase, will determine the MTD of the combination regimen. The second phase, the Dose Expansion Phase, will further evaluate the combination regimen to confirm RP2D.

• Study Type: Interventional
• Enrollment (Actual): 120
• Phase: Phase 2; Phase 1

Contacts and Locations

Study Locations

• Korea, Republic of
  • Goyang, Korea, Republic of
    • National Cancer Center
  • Seongnam, Korea, Republic of
    • Seoul National University Bundang Hospital
  • Seoul, Korea, Republic of
    • Samsung Medical Center
  • Seoul, Korea, Republic of, 05505
    • Asan Medical Center
  • Seoul, Korea, Republic of
    • Yeonsei University Hospital

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 19 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

[Inclusion Criteria]

General Inclusion Criteria

1. Male and female Age ≥19 years at the time of screening
2. Patients must be able to swallow tablets and absorb vactosertib.

[Diagnosis/Condition for Entry into the Trial]

1. World Health Organization (WHO) / Eastern Cooperative Oncology Group (ECOG) performance status (PS) of 0 or 1 at enrollment
2. Must have a life expectancy of at least 12 weeks
3. Patients with histologically or cytologically confirmed advanced or metastatic non microsatellite instability high (MSI-H)/mismatch repair deficiency (dMMR) colorectal cancer who have disease progression after treatment with all available therapies including fluoropyrimidine and oxaliplatin or irinotecan for metastatic disease that are known to confer clinical benefit, or are intolerant to treatment, or refuse standard treatment.
4. Patients with histologically- or cytologically- confirmed, advanced or metastatic diffuse-type adenocarcinoma of the stomach or gastroesophageal (GE) junction who have had disease progression after at least two previous courses of chemotherapy for metastatic disease, which should include fluoropyrimidine and platinum.
5. Confirmation of measurable disease based on RECIST 1.1 by investigators at Screening will be used to determine patient eligibility and imaging shows at least 1 lesion that is appropriate for selection as a target lesion per RECIST 1.1 is required prior to patient treatment. Lesions situated in a previously irradiated area are considered measurable if progression has been demonstrated in such lesions. Tumor assessment by computed tomography (CT) scan or magnetic resonance imaging (MRI) must be performed within 28 days prior to C1D1.
6. All patients enrolled must be ICI-naïve patients defined as no prior exposure to immune-mediated therapy including, but not limited to, other anti CTLA-4, anti-PD-1, anti-PD-L1, and anti-programmed cell death ligand 2 (anti-PD-L2) antibodies, excluding therapeutic anticancer vaccines.
7. All patients must be able to provide a newly acquired tumor biopsy during screening (preferred) or provide an available archived tumor sample. Tumor lesions used for newly acquired biopsies should not be target lesions, unless there are no other lesions suitable for biopsy, and in this instance only core needle (not excisional/incisional) biopsy is allowed.
8. Patients must provide consent for an additional biopsy on C2D3-6 or C2D10-13. Post-treatment biopsy must be obtained from the same organ site as pre-treatment biopsy, if feasible, to avoid introduction of heterogeneity related to the site of tumor or metastasis. If submitting unstained cut slides, freshly cut slides should be submitted to the testing laboratory within 20 days from when the slides are cut. See Study Manual for an explanation.
9. Have adequate organ function as defined in the following Table 3.

[Exclusion Criteria]

Pregnancy Exclusion:

1. A woman of childbearing potential (WOCBP) who has a positive urine pregnancy test within 7 days prior to treatment. If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required.
2. Is pregnant or breastfeeding or expecting to conceive or father children within the projected duration of the study, starting with the screening visit through 120 days after the last dose of study treatment.

Prior/Concurrent Clinical Study Experience

1. Is currently participating in or has participated in a study of an investigational agent or has used an investigational device within 4 weeks prior to the first dose of study treatment.

Prior/Concomitant Therapy

1. Has received prior therapy with an anti-PD-1, anti-PD-L1, or anti PD-L2 agent or with an agent directed to another stimulatory or co-inhibitory T-cell receptor (e.g., CTLA-4, OX 40, CD137) Has received prior systemic anti-cancer therapy including investigational agents within 4 weeks [could consider shorter interval for kinase inhibitors or other short half-life drugs] prior to treatment.
2. Has received prior radiotherapy within 2 weeks of start of study treatment. Patients must have recovered from all radiation-related toxicities, not require corticosteroids, and not 49 have had radiation pneumonitis. A 1-week washout is permitted for palliative radiation (≤2 weeks of radiotherapy) to non-central nervous system (CNS) disease.
3. Has received a live vaccine within 30 days prior to the first dose of study drug. Examples of live vaccines include, but are not limited to, the following: measles, mumps, rubella, varicella/zoster (chicken pox), yellow fever, rabies, Bacillus Calmette-Guérin (BCG), and typhoid vaccine. Seasonal influenza vaccines for injection are generally killed virus vaccines and are allowed; however, intranasal influenza vaccines (e.g., FluMist®) are live attenuated vaccines and are not allowed.
4. The prohibited medications when using vactosertib are following (Refer to Appendix E). A minimal washout period of 5 half-lives for the following drugs is recommended prior to the first dosing.

Medical conditions

1. Has a diagnosis of immunodeficiency or is receiving chronic systemic steroid therapy (in dosing exceeding 10 mg daily of prednisone equivalent) or any other form of immunosuppressive therapy within 14 days prior the first dose of study drug.

2. Has a known additional malignancy that is progressing or has required active treatment within the past 3 years.

   Note: Patients with basal cell carcinoma of the skin, squamous cell carcinoma of the skin, [additional examples can be added if important to the study such as transitional cell carcinoma of urothelial cancer], or carcinoma in situ (e.g., breast carcinoma, cervical cancer in situ) that have undergone potentially curative therapy are not excluded.

3. Has known CNS metastases and/or leptomeningeal involvement
4. Has severe hypersensitivity (≥Grade 3) to pembrolizumab or vactosertib and/or any of its excipients
5. Has an active autoimmune disease that has required systemic treatment in past 2 years (i.e., with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Replacement therapy (e.g., thyroxine, insulin, or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency) is not considered a form of systemic treatment and is allowed.
6. Has a history of (non-infectious) pneumonitis that required steroids or has current pneumonitis.
7. Has an active infection requiring systemic therapy.
8. Has a known history of human immunodeficiency virus (HIV) infection or HIV test (+) in screening test. No HIV testing is required unless mandated by local health authority.
9. Has a known history of Hepatitis B (defined as Hepatitis B surface antigen [HBsAg] reactive) or known active Hepatitis C virus (defined as HCV RNA [qualitative] is detected) infection.
10. Uncontrolled intercurrent illness, including but not limited to, ongoing or active infection, symptomatic congestive heart failure (New York Heart Association Class III/IV), uncontrolled hypertension (≥150/90mmHg), unstable angina pectoris or myocardial infarction (≤ 6 months prior to screening), uncontrolled cardiac arrhythmia, clinically significant cardiac valvulopathy requiting treatment, active interstitial lung disease, serious chronic gastrointestinal conditions associated with diarrhea, or psychiatric illness/social situations that would limit compliance with study requirement, substantially increase risk of incurring AEs or compromise the ability of the patient to give written informed consent
11. QT interval corrected for heart rate using Fridericia's formula (QTcF) ≥450 ms in male and ≥470 ms in female calculated from 12-lead ECGs
12. Has a history or current evidence of any condition, therapy, or laboratory abnormality that might confound the results of the study, interfere with the patient's participation for the full duration of the study, or is not in the best interest of the patient to participate, in the opinion of the treating investigator.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

3

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Dose Expansion (300mg BID); TEW-7197 300mg BID, 5D/W + Pembrolizumab 200mg Q3W (n= 30)	Drug: TEW-7197; Vactosertib will be administered orally without regard to meals for 5 days per week (5D/W) at the same time in the morning (QD), at the same time in the morning and evening (BID) approximately 12 hours apart. Pembrolizumab will be administered as a dose of 200 mg using a 30-minute IV infusion. Sites should make every effort to target infusion timing to be as close to 30 minutes as possible.; Other Names: vactosertib
Experimental: Dose Expansion (200mg BID); TEW-7197 200mg BID, 5D/W + Pembrolizumab 200mg Q3W (n= 30)	Drug: TEW-7197; Vactosertib will be administered orally without regard to meals for 5 days per week (5D/W) at the same time in the morning (QD), at the same time in the morning and evening (BID) approximately 12 hours apart. Pembrolizumab will be administered as a dose of 200 mg using a 30-minute IV infusion. Sites should make every effort to target infusion timing to be as close to 30 minutes as possible.; Other Names: vactosertib
Experimental: Dose Expansion (200mg QD); TEW-7197 200mg QD, 5D/W + Pembrolizumab 200mg Q3W (n= 30)	Drug: TEW-7197; Vactosertib will be administered orally without regard to meals for 5 days per week (5D/W) at the same time in the morning (QD), at the same time in the morning and evening (BID) approximately 12 hours apart. Pembrolizumab will be administered as a dose of 200 mg using a 30-minute IV infusion. Sites should make every effort to target infusion timing to be as close to 30 minutes as possible.; Other Names: vactosertib

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Maximum Tolerated Dose	Incidence of nature of DLTs	approximately 2 years
Safety and Tolerability	Incidence, nature and severity of adverse events (AEs) graded according to NCI CTCAE v5.0	approximately 2 years

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Efficacy 1	Objective response rate (ORR) as assessed using RECIST version 1.1 and iRECIST by investigators	approximately 2 years
Efficacy 2	Progression Free Survival (PFS)	approximately 2 years
Efficacy 3	Overall Survival (OS)	up to 3 years

Collaborators and Investigators

• Sponsor: MedPacto, Inc.
• Collaborators: Merck Sharp & Dohme LLC
• Investigators: Study Director: Minkyu Heo, MedPacto, Inc.

Study record dates

Study Major Dates

• Study Start (Actual): December 20, 2018
• Primary Completion (Actual): May 7, 2024
• Study Completion (Actual): May 7, 2024

Study Registration Dates

• First Submitted: October 10, 2018
• First Submitted That Met QC Criteria: October 28, 2018
• First Posted (Actual): October 30, 2018

Study Record Updates

• Last Update Posted (Actual): March 25, 2025
• Last Update Submitted That Met QC Criteria: March 21, 2025
• Last Verified: March 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Neoplasms by Site; Neoplasms; Neoplasms by Histologic Type; Gastrointestinal Neoplasms; Digestive System Neoplasms; Digestive System Diseases; Gastrointestinal Diseases; Stomach Diseases; Head and Neck Neoplasms; Neoplasms, Glandular and Epithelial; Esophageal Diseases; Carcinoma; Stomach Neoplasms; Esophageal Neoplasms; Adenocarcinoma; Molecular Mechanisms of Pharmacological Action; Enzyme Inhibitors; Protein Kinase Inhibitors; Vactosertib
• Other Study ID Numbers: MP-VAC-204; Mk3475 Keynote 900 (Other Identifier: MSD)

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No