This is a single-arm, open-label Phase IIa study designed to evaluate the efficacy, safety, and PK of CVM-1118 in combination with Sintilimab (Tyvyt ®) and TACE in participants with incurable/non-metastatic HCC. Approximately 40 participants will be enrolled, all receiving CVM-1118 (200 mg orally \[PO\], twice daily \[BID\]) in combination with Sintilimab (200 mg via intravenous \[IV\] infusion every 3 weeks \[Q3W\]) and TACE. All participants will initiate treatment with CVM-1118 and Sintilimab on Cycle 1 Day 1 (C1D1), with each cycle lasting 21 days, continuing until the occurrence of unacceptable toxicity, disease progression, death, consent withdrawal, for 2 years (i.e., Cycle 34) or study termination (whichever occurs first). CVM-1118 will be temporarily suspended from 2 days prior to each TACE procedure until 7 days post-TACE. The protocol permits conventional TACE (cTACE) or drug-eluting beads TACE (DEB-TACE) based on investigator's discretion, with the requirement that each participant maintains the same TACE modality throughout the treatment period. The first TACE procedure will be initiated between weeks 2-4 (C1D15 - C2D8) following systemic therapy initiation, with a maximum of 2 TACE treatments per lesion, an interval of ≥1 month between TACE sessions, and no more than 4 TACE treatments in total per participant. The study comprises four periods: screening, treatment, safety follow-up, and survival follow-up. During the screening period, participants will undergo required examinations and evaluations. Eligible participants will enter the treatment period to receive the combination regimen. Tumor response will be assessed per RECIST v1.1 and mRECIST (see Appendix 1), with evaluations conducted every 9 weeks (±1 week) following initial dosing. During the safety follow-up period, all participants will undergo final safety assessments 28 days (+7 days) after investigational product cessation or prior to initiating new antitumor therapy. Subsequently, participants will enter the survival follow-up period with 12-week interval contacts to document disease status, anti-tumor therapies received, survival status, and other relevant clinical information until death, loss to follow-up, consent withdrawal, or study closure (whichever occurs first). Throughout the study, participants will undergo scheduled safety evaluations and PK blood sampling at designated timepoints. Subsequent PK sampling schedules may be adjusted or eliminated based on accumulated pharmacokinetic data from preceding participants. * CVM 1118 will be administered at 200 mg, PO, BID. Treatment continues until unacceptable toxicity, disease progression, death, consent withdrawal, for 2 years (i.e., Cycle 34), or study termination (whichever occurs first). CVM-1118 will be temporarily suspended from 2 days prior to each TACE procedure until 7 days post-TACE. CVM-1118 should be swallowed whole with a glass of water in a fasted state, with no food intake for at least 2 hours before and 1 hour after CVM 1118 administration. CVM 1118 should be administered at approximately the same time each day. Investigators are permitted to adjust the dosing for participants as required by referring to the "Dose Adjustment". * Sintilimab will be administered at 200 mg, IV, Q3W. Treatment continues until unacceptable toxicity, disease progression, death, consent withdrawal, for 2 years (i.e., Cycle 34) or study termination (whichever occurs first). Investigators are permitted to adjust the drug administration regimen for participants as required by referring to the "Dose Adjustment". * TACE modality for each participant, including the choice between cTACE and DEB-TACE, will be determined by investigators at their discretion; however, each participant must remain consistent with the selected TACE modality (cTACE or DEB-TACE) throughout the treatment period. The first TACE procedure will be initiated 2-4 weeks after the start of systemic therapy (C1D15 to C2D8), with a maximum of 2 treatments per lesion (minimum 1-month interval between TACE sessions) and up to 4 treatments per participant in total.
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Objective response rate (ORR)
Timeframe: Up to approximately 2 years