Chemotherapy/Radiation

The objectives of this study is to estimate the biological activity of combination chemotherapy and radiation versus radiation alone in patients with Hepato Cellular Carcinoma (HCC). The study hypothesizes is that combination chemotherapy and radiation is superior to radiation alone in inducing a biological response. The study hypothesizes that combination chemotherapy and radiation is superior to radiation alone in inducing a biological response. A biological response, or change in the tumor microenvironment (TME), is defined by reduced infiltration of intra-tumoral regulatory T cells (Tregs), a decrease in tumour-associated macrophages (TAMs) of the M2 phenotype, and an increase in immune cells such as effector CD8+ T-cells. An increased rate of biological response is therefore expected in participants receiving the combination of Durvalumab, Tremelimumab, and stereotactic body radiation therapy (SBRT), compared to those receiving SBRT alone. Additionally, biological response is hypothesized to correlate with pathological response. The study has been conducted within a WOO window of opportunity randomized clinical trial in order to obtain data in the quickest and safest manner. Patients undergoing surgery are very healthy by definition and will be able to tolerate treatment without any major complications, leading to adequate tissue samples before and after treatment.