This is an open-label, multicenter Phase Ib/II clinical study designed to evaluate the safety, tolerability, and efficacy of combination therapy with SYS6090 Injection in participants with hepatocellular carcinoma (HCC).
The participant voluntarily signs the informed consent form.
Aged ≥18 years at the time of informed consent acquisition.
Confirmed diagnosis of hepatocellular carcinoma (HCC) via histopathology, cytopathology, or clinical diagnosis in accordance with the Guidelines for Diagnosis and Treatment of Primary Liver Cancer (2026 Edition).
Barcelona Clinic Liver Cancer (BCLC) Stage C; or BCLC Stage B unsuitable for curative surgery and/or locoregional therapy.
Histologically or cytologically confirmed fibrolamellar hepatocellular carcinoma, sarcomatoid hepatocellular carcinoma, intrahepatic cholangiocarcinoma, or mixed hepatocellular-cholangiocarcinoma.
Received any anti-tumor therapy (including chemotherapy, targeted therapy, immunotherapy, etc.) or any investigational trial intervention within 4 weeks prior to the first study drug administration or within 5 half-lives of the most recent anti-tumor agent (whichever is shorter); or received Chinese patent medicines with anti-tumor indications, palliative radiotherapy, or locoregional therapy within 14 days prior to the first study drug administration.
Underwent major visceral surgery (excluding core needle biopsy) or sustained severe trauma within 4 weeks prior to the first study drug administration, or planned elective surgery during the study period.
Received systemic corticosteroids or other immunosuppressive agents within 14 days prior to the first study drug administration, except for the following scenarios: physiologic replacement doses of hydrocortisone or equivalent hormones (i.e., prednisone ≤10 mg/day or equivalent); topical, ophthalmic, intra-articular, intranasal, or inhaled corticosteroids; short-course corticosteroids for prophylaxis (e.g., prophylaxis against contrast medium allergy).