A Clinical Trial of TQB6426 for Injection in Patients With Advanced Solid Tumors

Inclusion Criteria: 1. Study participants voluntarily enroll in this study, sign the informed consent form, and demonstrate good treatment compliance. 2. Age ranging from 18 to 75 years (calculated based on the date of informed consent signature). 3. Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1. 4. Estimated survival time exceeding 12 weeks. 5. Child-Pugh liver function score ≤ 7 points (Class B). 6. Per Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST v1.1): - Dose-escalation phase: At least one evaluable tumor lesion; - Dose-expansion phase: At least one measurable tumor lesion. Target lesions must not have received prior local therapies, including transarterial embolization (TAE), transarterial chemoembolization (TACE), transarterial radioembolization (TARE), surgery, radiofrequency ablation (RFA), microwave ablation (MWA), other thermal ablation, percutaneous ethanol injection (PEI), radiotherapy, etc. 7. Participants must provide qualified tumor tissue specimens, or consent to submit archived tumor tissue samples, or undergo percutaneous core biopsy or surgical biopsy on previously unirradiated tumor lesions to supply specimens for central laboratory biomarker testing. 8. Dose-escalation phase: Advanced solid tumors confirmed via histopathological or cytological examination with failure of prior standard systemic anti-tumor therapies. 9. Dose-expansion phase: Glypican-3 (GPC3) positivity confirmed by immunohistochemistry (IHC); prior IHC test reports are acceptable. 10. Hematology laboratory criteria (no blood transfusion/blood products or hematopoietic stimulating factor administration within 14 days prior to screening): Absolute Neutrophil Count (ANC) ≥ 1.5 × 10⁹/L; Platelet count ≥ 100 × 10⁹/L; Hemoglobin ≥ 90 g/L. 11. Serum biochemistry laboratory criteria: 1) Alanine Aminotransferase (ALT) and Aspartate Aminotransferase (AST) ≤ 3 × Upper Limit of Normal (ULN); for patients with intrahepatic metastases, ALT and AST ≤ 5 × ULN; 2) Total Bilirubin (TBIL) ≤ 3 × ULN (≤ 3 × ULN allowed for patients with Gilbert's syndrome); 3) Serum albumin ≥ 28 g/L; 4) Serum Creatinine (Cr) ≤ 1.5 × ULN, or estimated creatinine clearance ≥ 50 mL/min calculated via the Cockcroft-Gault formula. 12. Urinalysis criteria: Urine protein \< 2+ on routine urinalysis; if urine protein ≥ 2+, 24-hour urinary protein quantification must be confirmed ≤ 1.0 g. 13. Coagulation function criteria: Prothrombin Time (PT), Activated Partial Thromboplastin Time (APTT), and International Normalized Ratio (INR) ≤ 1.5 × ULN (for patients without prior anticoagulant therapy). 14. Thyroid function criteria: Thyroid-Stimulating Hormone (TSH) ≤ ULN; participants with abnormal TSH but normal free T3 and free T4 levels are eligible for enrollment. 15. Women of childbearing potential must agree to use effective contraception throughout the study and for 6 months after study completion, and have a negative serum pregnancy test within 7 days prior to enrollment. Male participants must agree to use effective contraception throughout the study and for 6 months following study completion. Exclusion Criteria: 1. Exclusion Criteria Subjects satisfying any of the following criteria shall be excluded from this trial: Prior treatment with GPC3-targeted agents or other antibody-drug conjugates (ADCs) utilizing topoisomerase I inhibitors as cytotoxic payloads. 2. Diagnosis of another malignant tumor within 5 years prior to the first study dose, or concurrent secondary malignancy at screening. Eligible exceptions are as follows: other malignancies cured by single surgical resection with a continuous 5-year disease-free survival (DFS); cured cervical carcinoma in situ, papillary thyroid carcinoma, non-melanoma skin cancer, and superficial bladder tumors \[Ta (non-invasive carcinoma), Tis (carcinoma in situ), T1 (tumor invading lamina propria)\]. 3. Medical conditions interfering with intravenous injection or venous blood collection (including but not limited to active phlebitis, severe lymphedema, extensive cutaneous infection, etc.). 4. Unresolved adverse toxicities higher than CTCAE Grade 1 stemming from prior therapies, excluding alopecia, skin pigmentation, and toxicities deemed by the Investigator to carry no safety risks. 5. Major surgical procedures, significant traumatic injuries within 4 weeks before the first dose, or persistent unhealed wounds/fractures. 6. Any hemorrhagic event ≥ CTCAE Grade 3 occurring within 4 weeks prior to the first administration of study drug. 7. History of arterial or venous thromboembolic events within 6 months before the first dose, such as cerebrovascular accidents (including transient ischemic attacks), deep vein thrombosis, pulmonary embolism, or any other severe thromboembolism. (Note: Thrombosis related to implantable venous access ports, catheter-induced thrombosis, or superficial venous thrombosis shall not be categorized as "severe" thromboembolism.) 8. Poorly controlled active viral hepatitis. Subjects meeting the below criteria may proceed to screening: HBsAg-positive participants with HBV DNA \< 2000 IU/mL (or 10,000 copies/mL) who agree to continuous anti-HBV therapy throughout the study; participants with HCV infection requiring treatment may receive approved antiviral regimens during the trial. 9. Imaging confirmation of inferior vena cava tumor thrombus, complete occlusion of the main portal vein (tumor thrombus or blood thrombus), concurrent tumor thrombus invasion of the main portal vein plus primary branches, or portal vein tumor thrombus extending into the superior mesenteric vein, splenic vein or more proximal vessels. 10. Peptic ulcer disease or inflammatory bowel disease. 11. Active syphilis infection requiring clinical treatment. 12. Active pulmonary tuberculosis, history of idiopathic pulmonary fibrosis, organizing pneumonia, drug-induced pneumonitis/radiation pneumonitis requiring treatment, symptomatic active pneumonia; prior inters…

Reproduced word-for-word from the public registry record — the study team can answer questions about it.