A Study to Assess the Safety, Pharmacokinetics, Pharmacodynamics, and Preliminary Efficacy of ATG 037 Monotherapy and Combination Therapy With Pembrolizumab in Patients With Advanced Solid Tumors

Phase 1

Recruiting

• Conditions: Locally Advanced or Metastatic Solid Tumors
• Interventions: Drug: ATG-037; Drug: KEYTRUDA ®( Pembrolizumab)

• Registration Number: NCT05205109
• Lead Sponsor: Antengene Therapeutics Limited

Brief Summary

This is a study of ATG-037 Monotherapy and Combination Therapy with Pembrolizumab in Patients with Locally Advanced or Metastatic Solid Tumors

Detailed Description

This is a Phase I, Multi-center, Open-label, and Dose-finding Study to Assess the Safety, Pharmacokinetics, Pharmacodynamics, and Preliminary Efficacy of ATG-037 Monotherapy and Combination Therapy with Pembrolizumab in Patients with Locally Advanced or Metastatic Solid Tumors.

Number of subjects :

1. 39-51 subjects for Dose escalation phase part 1

2. Maximum of 18 subjects or Dose escalation phase part 2

3. 24-34 subjects per Dose expansion cohort

Study Timeline

• Study First Submitted: 2022-01-11
• Study First Submitted QC: 2022-01-11
• Study First Posted: 2022-01-24
• Study Start: 2022-06-07
• Status Verified: 2025-06
• Last Update Submitted: 2025-06-05
• Last Update Posted: 2025-06-09
• Primary Completion: 2027-08-30
• Study Completion: 2028-02-28

Recruitment & Eligibility

• Status: RECRUITING
• Sex: All
• Target Recruitment: 98

Inclusion Criteria

1. Provision of signed and dated, written informed consent prior to any study-specific procedures, sampling, and analyses.
2. Aged at least 18 years as of the date of consent.
3. Unresectable Stage III or Stage IV melanoma patients, who have had disease progression on or after at least one prior ICI containing treatment. Patients with mucosal and uveal melanoma types are to be excluded.
4. There is at least one measurable lesion according to Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1.
5. Estimated life expectancy of a minimum of 12 weeks.
6. Subjects with acquired immune checkpoint inhibitors resistance (objective response or SD>6 months).
7. Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1 at ICF signature.
8. Females should be using adequate contraceptive measures until 180 days after the end of treatment, should not be breastfeeding.
9. Male subjects should be willing to use barrier contraception, ie condoms, for the duration of the study and 180 days after the final dose of study treatment.
10. Subjects should have adequate organ function.

Exclusion Criteria

1. Primary central nervous system disease, central nervous system metastatic disease, leptomeningeal disease, metastatic cord compression or carcinomatous meningitis.
2. Prior exposure to a CD73 inhibitor/antibody or adenosine receptor inhibitor.
3. Patients considered to have rapidly progressive disease (from the starting of prior line therapy to disease progression lasting no more than 90 days).
4. Prior therapy with any chemotherapy, immunotherapy, anticancer agents or investigational products from a previous clinical study within 28 days of the first dose of study treatment or within a period during which the investigational product or systemic anticancer treatment has not been cleared from the body.
5. Radiotherapy with a wide field of radiation within 28 days, or radiotherapy with a limited field of radiation for palliation within 14 days of the first dose of study treatment. Subject must have recovered from all radiation related toxicity, not requiring corticosteroids.
6. Prior major surgery (excluding placement of vascular access) within 28 days of the first dose of study treatment or minor surgical procedures ≤7 days.
7. Except for alopecia, platinum-induced peripheral neurotoxicity (≤Grade 2). Any unresolved toxicities from prior therapy greater than Common Terminology Criteria for Adverse Events (CTCAE 5.0) Grade 1 at the time of ICF signature.
8. Received any prior immunotherapy and was discontinued from that treatment due to a Grade 3 or higher irAE (except endocrine disorders that can be treated with replacement therapy) or was discontinued from that treatment due to Grade 2 myocarditis or recurrent Grade 2 pneumonitis.
9. Subjects receiving unstable or increasing doses of corticosteroids.
10. As judged by the investigator, any evidence of severe or uncontrolled systemic diseases, including uncontrolled hypertension defined as a blood pressure (BP) ≥160/100 mmHg despite medical therapy, unstable or uncompensated respiratory and renal disease, active bleeding diseases, allogeneic stem cell transplantation, or any solid organ transplant, etc.

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: SEQUENTIAL

Arm && Interventions

Group	Intervention	Description
ATG-037+Keytruda(Pembrolizumab, MK-3475)	KEYTRUDA ®( Pembrolizumab)	Part I: Dose Escalation Phase of ATG-037 Monotherapy PartII: Dose Escalation Phase and Dose Expansion Phase of ATG-037 in Upfront Combination with Keytruda(Pembrolizumab, MK-3475)
ATG-037+Keytruda(Pembrolizumab, MK-3475)	ATG-037	Part I: Dose Escalation Phase of ATG-037 Monotherapy PartII: Dose Escalation Phase and Dose Expansion Phase of ATG-037 in Upfront Combination with Keytruda(Pembrolizumab, MK-3475)

Primary Outcome Measures

Name	Time	Method
DLT	Up to 21 Days	Number of Participants with Dose Limiting Toxicity
MTD	Up to 21 Days	Maximum tolerated dose of ATG-037
RP2D	Up to 21 Days	Recommended phase 2 dose of ATG-037
Incidence of adverse events and server adverse events	One year after last patient first dose	Will be graded according to the NCI-CTCAE Grading Scale version 5.0.

Secondary Outcome Measures

Name	Time	Method
Plasma concentration of ATG-037 and derived PK parameters	One year after last patient first dose	To characterize the PK/PDx of ATG-037
ORR as per RECIST v1.1 and DOR, DCR, PFS, OS evaluated by the investigators	One year after last patient first dose	To evaluate the preliminary antitumor activity of ATG-037 monotherapy and combination therapy with pembrolizumab
Inhibition of CD73 enzymatic activity in plasma	One year after last patient first dose	To evaluate the preliminary antitumor activity of ATG-037 monotherapy and combination therapy with pembrolizumab

Trial Locations

Locations (7)

Calvary Mater Newcastle; 🇦🇺 Sydney, New South Wales, Australia

Pindara Private Hospital; 🇦🇺 Benowa, Queensland, Australia

Southern Oncology Clinical Research Unit; 🇦🇺 Bedford Park, South Australia, Australia

Peninsula & South Eastern Haematology and Oncology Group; 🇦🇺 Frankston, Victoria, Australia

One Clinical Research Pty Ltd; 🇦🇺 Mount Pleasant, Western Australia, Australia

Chongqing Cancer Hospital; 🇨🇳 Chongqing, Chongqing, China

Guangdong Provincial People's Hospital; 🇨🇳 Guangzhou, Guangdong, China