GenSci143 in Participants With Advanced Solid Tumors

A Phase 1, Multicenter, Open-Label, First-in-Human Study to Evaluate the Safety, Tolerability, Pharmacokinetics and Preliminary Anti-Tumor Activity of GenSci143 in Participants With Advanced Solid Tumors

A Phase 1 Study to Evaluate the Safety, Tolerability, Pharmacokinetics and Preliminary Anti-Tumor Activity of GenSci143 in Participants with Advanced Solid Tumors

Study Overview

• Status: Recruiting
• Conditions: Advanced Solid Tumors
• Intervention / Treatment: Drug: GenSci143 for injection

Detailed Description

A Phase 1 Study to Evaluate the Safety, Tolerability, Pharmacokinetics and Preliminary Anti-Tumor Activity of GenSci143 in Participants with Advanced Solid Tumors

• Study Type: Interventional
• Enrollment (Estimated): 180
• Phase: Phase 1

Contacts and Locations

• Study Contact: Name: Dingwei Ye; Phone Number: +86 13701663571; Email: dwyeli@163.com

Study Locations

• China
  • Henan
    • Zhengzhou, Henan, China, 451191
      • Recruiting
      • The First Affiliated Hospital of Zhengzhou University
  • Hubei
    • Wuhan, Hubei, China, 430079
      • Recruiting
      • Hubei Cancer Hospital
  • Hunan
    • Changsha, Hunan, China, 410013
      • Not yet recruiting
      • Hunan Cancer Hospital
  • Jiangsu
    • Nanjing, Jiangsu, China, 210000
      • Recruiting
      • Nanjing Drum Tower Hospital
  • Shandong
    • Jinan, Shandong, China, 250117
      • Not yet recruiting
      • Shandong Cancer Hospital
  • Shanghai Municipality
    • Shanghai, Shanghai Municipality, China, 200032
      • Recruiting
      • Fudan University Shanghai Cancer Center
      • Contact: Dingwei Ye; Phone Number: +8613701663571; Email: dwyeli@163.com
    • Shanghai, Shanghai Municipality, China, 200032
      • Not yet recruiting
      • Zhongshan Hospital Affiliated to Fudan University
  • Shanxi
    • Taiyuan, Shanxi, China, 030001
      • Not yet recruiting
      • The First Hospital of Shanxi Medical University
  • Zhejiang
    • Hangzhou, Zhejiang, China, 310024
      • Not yet recruiting
      • The First Affiliated Hospital of Zhejiang University school of medicine

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Voluntarily sign the ICF.
• Male or female participants ≥18 years old at the time of signing the ICF.

• Meet the requirements of tumor types as outlined below:

  1. Dose escalation: Participants with histologically or cytologically documented recurrent or metastatic advanced solid tumors, and who have progressed after standard therapy, are intolerant to standard therapy, or have no standard therapy available.
  2. Dose expansion:

Cohort 1: Participants with histologically or cytologically documented mCRPC，who had received at least one prior novel hormonal therapy (including but not limited to abiraterone, enzalutamide, darolutamide, apalutamide) and progressed on standard chemotherapy regimens, are intolerant to chemotherapy, or decline chemotherapy.

Cohort 2: Participants with histologically or cytologically documented other advanced solid tumors, and who have progressed after standard therapy, are intolerant to standard treatment, or have no standard therapy available.

• Life expectancy of ≥ 12 weeks.
• ECOG PS 0-1
• Have at least 1 evaluable tumor lesion according to RECIST v1.1. Participants with mCRPC who have bone only disease may be eligible on a case-by-case basis after discussion between the investigator and Sponsor
• Able to provide either archival or fresh biopsy formalin-fixed paraffin-embedded (FFPE) tumor samples.

• Adequate organ function at the time of screening, as outlined below:

  1. Hematology: Absolute neutrophil count (ANC) ≥ 1.5×109/L (1500/µL); platelet count (PLT)≥100×109/L (100,000/µL); hemoglobin (HGB) ≥ 90 g/L (9 g/dL) (have not received granulocyte colony-stimulating factor (G-CSF) within 7 days before the first dose of GenSci143, and have not received granulocyte-macrophage colony-stimulating factor (GM-CSF), blood transfusion, erythropoietin (EPO), platelet transfusion, thrombopoietin (TPO), or interleukin-11 (IL-11) within 14 days before the first dose of GenSci143).
  2. Liver function: Serum total bilirubin (TBIL) ≤ 1.5 upper limit of normal (ULN), and serum TBIL≤ 3×ULN in the presence of liver metastasis or documented Gilbert syndrome. Alanine aminotransferase (ALT) and aspartate aminotransferase (AST) ≤ 3×ULN if no liver metastasis; ALT and AST≤ 5×ULN in the presence of liver metastasis.
  3. Renal function: creatinine clearance (CLcr) ≥ 50 mL/min as calculated using the Cockcroft-Gault formula.
  4. Coagulation function: Prothrombin Time (PT), activated partial thromboplastin time (APTT), and international normalized ratio (INR) ≤ 1.5×ULN (or within target range if on anticoagulation therapy).
• Toxicities (other than alopecia) from previous anticancer therapy must have resolved to NCI-CTCAE v5.0 Grade ≤1.
• Women of childbearing potential (WOCBP) must have a serum pregnancy test negative within 7 days before the first dose of GenSci143. WOCBP must agree to use highly effective contraceptive methods and must not donate or retrieve ova for personal use from the time of informed consent until 6 months after the last dose of GenSci143. Male participants must agree to use highly effective contraceptive methods and must not freeze or donate sperm from the time of informed consent until 6 months after the last dose of GenSci143.

Exclusion Criteria:

• Participants with known spinal cord compression or active central nervous system (CNS) metastases, unless they are asymptomatic or have achieved post-treatment stability for >4 weeks and discontinued corticosteroids for >2 weeks before the first dose of GenSci143.
• History of other known malignancies within the past 3 years.
• Unstable thrombotic events requiring therapeutic intervention within 6 months before the first dose of GenSci143.
• Uncontrolled or clinically significant cardiovascular disease.
• Uncontrolled pleural fluid, pericardial effusion, or ascites requiring drainage, and/or diuretics within 2 weeks before the first dose of GenSci143.
• History of (non-infectious) interstitial lung disease (ILD)/pneumonitis that requires steroids, current ILD/pneumonitis, or where suspected ILD/pneumonitis cannot be ruled out by imaging at Screening. Any autoimmune, connective tissue, or inflammatory disorders with suspected pulmonary involvement.
• Pregnant, breastfeeding, or planning to become pregnant.
• Known active hepatitis B virus (HBV) or hepatitis C virus (HCV) infection.
• Known human immunodeficiency virus (HIV) infection
• Uncontrolled infection that requires systemic therapy with IV antibiotics, antivirals, or antifungals within 1 week before the first dose of GenSci143.
• Major surgery (excluding diagnostic surgery), radiotherapy, and immunotherapy within 4 weeks before the first dose of medication; Chemotherapy or antibody therapy within 3 weeks; Endocrine therapy and small molecule-targeted therapy within 2 weeks or 5 half-lives(whichever is shorter). Androgen-deprivation therapy with gonadotropin-releasing hormone (GnRH) analogues (either GnRH agonists or GnRH antagonists) was allowed for men with prostate cancer.
• Received any live vaccine within 4 weeks before the first dose of GenSci143 or intend to receive a live vaccine during the study.
• History of allogeneic hematopoietic stem cell transplantation (HSCT) or solid organ transplantation.
• Prior treatment with a topoisomerase inhibitor or an ADC that consists of a topoisomerase inhibitor.
• History of severe hypersensitivity reactions to GenSci143 and/or excipients in the drug product, or other monoclonal antibodies.
• Any illness (uncontrolled hypertension, serious diabetes mellitus, thyroid disorders, and psychiatric disorders, etc.) or other conditions that are not eligible for inclusion based on the investigator's judgment.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: GenSci143 for injection	Drug: GenSci143 for injection; GenSci143 for injection, administered Q3W, with a dosage ranging from 0.5mg/kg to 4.5mg/kg.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Part 1 and Part2:Incidence of adverse events Percentage of patients with adverse events by system organ class and preferred term.	From time of informed consent to 30days post last dose of GenSci143
Part1:Dose limiting toxicities(DLTs),DLTs are assessed during the DLT observation period and defined as any toxicity in DLT definition in the Clinical Study Protocal	Form time of first dose of GenSci143 to end of DLT observation period(approximately 21 days)
Part1: Maximum tolerated dose (MTD) and recommended dose for expansion (RDE) To determine the maximum tolerated dose (MTD) (if applicable) and recommended dose for expansion (RDE) of GenSci143.	Form time of first dose of GenSci143 up to 12 months.
Part1: Part2: Composite response rate To evaluate the efficacy of GenSci143 as using RECIST v1.1 and/or PSA50 response (PCWG3) with PC	Approximately 12 months.
Part1: Part2: Objective response rate(ORR) To evaluate the efficacy of GenSci143 as measured by ORR using RECIST v1.1 for participants with non-PC	Approximately 12 months.

Secondary Outcome Measures

Outcome Measure	Time Frame
AUC of GenSci143 Calculate area under the curve of GenSci143.	Approximately 12 months.
AUC of total antibody Calculate area under the curve of total antibody.	Approximately 12 months

Other Outcome Measures

Outcome Measure	Time Frame
AUC of unconjugated payload. Calculate area under the curve of unconjugated payload	Approximately 12 months
Cmax of GenSci143 Calculate maximum concentration of GenSci143.	Approximately 12 months
Cmax of total antibody Calculate maximum concentration of total antibody	Approximately 12 months
Cmax of unconjugated payload Calculate maximum concentration of unconjugated payload	Approximately 12 months
Tmax of GenSci143 Calculate time of maximum concentration of GenSci143	Approximately 12 months
Tmax of total antibody Calculate time of maximum concentration of total antibody	Approximately 12 months
Tmax of unconjugated payload Calculate time of maximum concentration of unconjugated payload	Approximately 12 months
CL of GenSci143 Calculate Cleanrance of GenSci143	Approximately 12 months
CL of total antibody Calculate Cleanrance of total antibody	Approximately 12 months
CL of unconjugated payload Calculate Cleanrance of unconjugated payload	Approximately 12 months
V of GenSci143 Calculate apparent volume of distribution of GenSci143	Approximately 12 months
V of total antibody Calculate apparent volume of distribution of total antibody	Approximately 12 months
V of unconjugated payload Calculate apparent volume of distribution of unconjugated payload	Approximately 12 months
t1/2 of GenSci143 Calculate time of half-life of GenSci143	Approximately 12 months
t1/2 of total antibody Calculate time of half-life of total antibody	Approximately 12 months
t1/2 of unconjugated payload Calculate time of half-life of unconjugated payload	Approximately 12 months
ADC of GenSci143 Incidence and titer of anti-drug antibody(ADA)	Approximately 12 months
NAb of GenSci143 Incidence and titer of anti-drug neutralizing(NAb)	Approximately 12 months
Prostate-specific antigen (PSA)50 response rate To evaluate the preliminary anti-tumor activity of GenSci143 by PSA50 as PCWG3 criteria and RECIST v1.1 with PC	Approximately 12 months
PSA90 response rate To evaluate the preliminary anti-tumor activity of GenSci143 by PSA90 as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
Best PSA response To evaluate the preliminary anti-tumor activity of GenSci143 by best PSA response as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
PSA progression-free survival (PSA-PFS) To evaluate the preliminary anti-tumor activity of GenSci143 by PSA-PFS as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
radiological PFS (rPFS) To evaluate the preliminary anti-tumor activity of GenSci143 by rPFS as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
failure-free survival (FFS) To evaluate the preliminary anti-tumor activity of GenSci143 by FFS as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
overall survival (OS) To evaluate the preliminary anti-tumor activity of GenSci143 by OS as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
objective response rate (ORR) To evaluate the preliminary anti-tumor activity of GenSci143 by ORR as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
disease control rate (DCR) To evaluate the preliminary anti-tumor activity of GenSci143 by DCR as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
duration of response (DoR) To evaluate the preliminary anti-tumor activity of GenSci143 by DoR as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
time to response (TTR) To evaluate the preliminary anti-tumor activity of GenSci143 by TTR as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
depth of response (DpR) To evaluate the preliminary anti-tumor activity of GenSci143 by DpR as PCWG3 criteria and RECIST v1.1 with PC.	Approximately 12 months
overall survival (OS) To evaluate the preliminary anti-tumor activity of GenSci143 by OS as RECIST v1.1 with non-PC.	Approximately 12 months
objective response rate (ORR) To evaluate the preliminary anti-tumor activity of GenSci143 by ORR as RECIST v1.1 with non-PC.	Approximately 12 months
disease control rate (DCR) To evaluate the preliminary anti-tumor activity of GenSci143 by DCR as RECIST v1.1 with non-PC.	Approximately 12 months
duration of response (DoR) To evaluate the preliminary anti-tumor activity of GenSci143 by DoR as RECIST v1.1 with non-PC.	Approximately 12 months
time to response (TTR) To evaluate the preliminary anti-tumor activity of GenSci143 by TTR as RECIST v1.1 with non-PC.	Approximately 12 months
depth of response (DpR) To evaluate the preliminary anti-tumor activity of GenSci143 by DpR as RECIST v1.1 with non-PC.	Approximately 12 months

Collaborators and Investigators

• Sponsor: Changchun GeneScience Pharmaceutical Co., Ltd.

Study record dates

Study Major Dates

• Study Start (Actual): December 20, 2025
• Primary Completion (Estimated): October 30, 2028
• Study Completion (Estimated): June 30, 2029

Study Registration Dates

• First Submitted: November 14, 2025
• First Submitted That Met QC Criteria: November 19, 2025
• First Posted (Estimated): November 26, 2025

Study Record Updates

• Last Update Posted (Actual): January 5, 2026
• Last Update Submitted That Met QC Criteria: December 30, 2025
• Last Verified: November 1, 2025

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Therapeutics; Drug Administration Routes; Drug Therapy; Injections
• Other Study ID Numbers: GenSci143-101

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: UNDECIDED

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No