Therapeutic Cancer Vaccine (AST-301, pNGVL3-hICD) in Gastric Cancer

Gastric Cancer Clinical Trial

— Conerstone3  

Official title:

A Phase 2 Study to Evaluate the Safety and Immunological Efficacy of Therapeutic Cancer Vaccine (AST-301, pNGVL3-hICD) in Patients With HER2 Expressing Gastric Cancer (CORNERSTONE-003)

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT05771584
• Other study ID #: PN-301-22
• Status: Recruiting
• Phase: Phase 2
• Start date: July 4, 2023
• Est. completion date: June 15, 2026

Study information

• Verified date: March 2023
• Source: Aston Sci. Inc.
• Contact: Minghua Huang, MD
• Phone: 82-2-2038-2347
• Email: mhhwang[@]astonsci.com
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The purpose of this early proof-of-concept study to evaluate the safety and immunologic efficacy of AST-301 in gastric cancer patients with HER2 expression (including both HER2 low expression and overexpression) who have completed the standard adjuvant treatment (including those who discontinued the standard adjuvant treatment due to intolerance).

Participants will be randomized 1:1 to either Arm 1 (Q3W, 3 cycles), or Arm 2 (Q3W, 6 cycles) of the study.

Safety Monitoring Committee (SMC) will oversee safety of study at 25% (6 participants), 50% (12 participants), and 75% (18 participants) of participants receive at least 1 dose of AST-301 and survival follow up will be performed to determine disease-free survival (DFS).

Description:

Participants will provide informed consent and will undergo Pre-Screening/Screening procedures before taking part in the study. Participants will be in Arm 1 and Arm 2 will be conducted in parallel. AST-301 will be administrated every 3 weeks for a total of 3 immunizations in Arm 1 and a total of 6 immunizations in Arm 2.

• Arm 1: 3 immunizations of AST-301 admixed with immunoadjuvant recombinant human granulocyte-macrophage colony stimulating factor (rhuGM-CSF) administered at 3-week intervals. (Total 300 μg of AST-301)

• Arm 2: 6 immunizations of AST-301 admixed with immunoadjuvant recombinant human granulocyte-macrophage colony stimulating factor (rhuGM-CSF) administered at 3-week intervals. (Total 600 μg of AST-301) Randomization will be stratified according to HER2 expression (HER2 low expression or HER2 overexpression).

For both Arm 1 and Arm 2 of the study there will be a Pre-screen period, followed by study periods: a Screening Period (Day -28 to Day -1), a Treatment Period (3 cycles/Arm 1 and 6 cycles/Arm 2), an end of treatment (EOT) visit and follow-up visits.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 24
• Est. completion date: June 15, 2026
• Est. primary completion date: October 15, 2023
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years to 85 Years

Eligibility

Key Inclusion Criteria:

• Underwent a curative surgery with standard lymph node dissection (confirmed with no residual tumor, R0 resection) and have completed standard adjuvant treatment

• Has stages II or III according to the 8th edition of the American Joint Committee on Cancer (AJCC)

• HER2 low expression and HER2 overexpression diagnosed according to the 2016 College of American Pathologists (CAP)/American Society for Clinical Pathology (ASCP)/American Society of Clinical Oncology (ASCO) guidelines

• Eastern Cooperative Oncology Group (ECOG) performance status of 0 to 1

• Demonstrates adequate organ function.

Key Exclusion Criteria:

• Has a history of hypersensitivity or other contraindications to rhuGM-CSF

• Has a history of other malignancies =5 years prior to first administration of Investigational Product (IP) except for adequately treated non-melanoma skin cancer or epithelial carcinoma without evidence of disease.

• Has received systemic immunosuppressants or were treated with systemic immunosuppressants =4 weeks prior to the first administration of Investigational Product (IP).

• Has a history of autoimmune disease or inflammatory disease

• Has active infection including tuberculosis, hepatitis B, hepatitis C or human immunodeficiency virus (HIV) infection

• Is pregnant or breastfeeding or expecting to conceive children

Related Conditions & MeSH terms

• Gastric Cancer
• Stomach Neoplasms

Intervention

Drug:
• AST-301
100 µg
• rhuGM-CSF
100 µg

Locations

Country	Name	City	State
Taiwan	Kaohsiung Medical University Chung-Ho Memorial Hospital	Kaohsiung
Taiwan	China Medical University Hospital	Taichung
Taiwan	Taichung Veterans General Hospital	Taichung
Taiwan	Chi Mei Medical Center	Tainan
Taiwan	Taipei Veterans General Hospital	Taipei
Taiwan	Chang Gung Memorial Hospital Linkou	Taoyuan

Sponsors (1)

Lead Sponsor	Collaborator
Aston Sci. Inc.

Country where clinical trial is conducted

Taiwan, 

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Number of participants with treatment-related adverse events as assessed by the National Cancer Institute Common Terminology Criteria for Adverse Events [NCI CTCAE] version 5.0.	To assess the safety of AST-301 administered in gastric cancer patients.	up to 20 weeks
Primary	Immunologic efficacy of AST-301 immunization	AST-301 specific interferon (IFN)-gamma enzyme-linked immune absorbent spot (ELISpot) assay	52 weeks
Secondary	1year Disease-Free Survival rate (DFS rate)	disease free survival rate at 1 year	12 months
Secondary	Disease-Free Survival rate (DFS rate) at end of study (EOS)	disease free survival at end of study	Overall study period approximately 31 months
Secondary	Compare immunogenicity of AST-301 between Arm 1 and Arm 2	AST-301-specific IFN ? response by ELISpot assay	52 weeks
Secondary	Change in central memory T-cell populations between Arm 1 and Arm 2	Central memory T-cell (cluster of differentiation 4 (CD4) + and cluster of differentiation 8 (CD8) +) by a flow cytometry analysis	52 weeks