PDCD1 and hepatocellular carcinoma: One of these will examine the outcome of combination therapy with CIK-DC plus Anti-PD-1 in refractory solid tumors, including HCC and CRC (NCT02886897); the efficacy and safety of adjuvant CIK in HCC patients undergoing liver transplantation (NCT03983967); and intermediate stage HCC who have undergone TACE (NCT02856815).