The correlation and prognostic value of serum levels of soluble programmed death protein 1 (sPD-1) and soluble programmed death-ligand 1 (sPD-L1) in patients with hepatocellular carcinoma Chang, B.; Huang, T.; Wei, H.; Shen, L.; Zhu, D.; He, W.; Chen, Q.; Zhang, H.; Li, Y.; Huang, R.; Li, W.; Wu, P. Cancer Immunology Immunotherapy Cii 68(3): 353-363 2019 0340-7004 10.1007/s00262-018-2271-4 https://eurekamag.com/research/065/937/065937706.php