BCLC Stage B Hepatocellular Carcinoma

The goal of this observational study is to learn about the different treatment options for intermediate-stage hepatocellular carcinoma. The main question it aims to answer is: \- What are the survival outcomes among participants aged 18 or older who receive treatment for intermediate-stage hepatocellular carcinoma?

The goal of this prospective clinical trial is to identify a predictive biomarker in patients with advanced HCC (stage B and C) using a combinatorial approach of the liquid biopsy. The main questions it aims to answer are: * Is multi-omic liquid biopsy approach able to identify a strong predictive biomarker of immunotherapy efficiency? * Is there a correlation between tissue biopsy (PD-L1 tissue level of expression) and liquid biopsy (detection of CTC expressing PD-L1) in HCC patients? Participants blood will be collected at several time points.

The purpose of this study is to evaluate the safety and efficacy of hepatic arterial infusion chemotherapy (HAIC) in combination with PD-1 inhibitors and Lenvatinib in patients with intermediate or advanced-stage hepatocellular carcinoma (HCC) after failure of systemic therapy recommended by BCLC.