Hye Won Lee, Kyung Joo Cho, Soon Young Shin, Ha Yan Kim, Eun Ju Lee, Beom Kyung Kim, Seung Up Kim, Jun Yong Park, Do Young Kim, Sang Hoon Ahn, Kwang-Hyub Han
J Liver Cancer. 2019;19(2):108-116. Published online September 30, 2019
Background/Aim s: Programmed death receptor 1 (PD-1) is a promising new target for treatment of patients with hepatocellular carcinoma (HCC). A high expression level of programmed death-ligand 1 (PD-L1) is a possible prognostic indicator for poor outcome in other malignancies. Here, we investigated the clinical significance of PD-1 and PD-L1 in patients with HCC.
Methods We enrolled patients with HCC who underwent surgical resection at Severance Hospital between 2012 and 2017 and investigated the levels of PD-L1 in HCC tissues (tPD-L1) and PD-L1/PD-1 in serum (sPD-L1/sPD-1). We also aimed to determine whether expression levels correlated with clinical and histological features.
Results A total of 72 patient samples were analyzed. The median sPD-L1 and sPD-1 levels were 25.72 and 341.44 pg/mL, respectively. A positive correlation was detected between tPD-L1 and sPD-1 levels (R2=0.426, P<0.001). The median sPD-1 level increased linearly with tPD-L1 score (P=0.002). During the follow-up period, HCC recurred in eight (11.1%) patients and liverrelated mortality occurred in eight (11.1%) patients. Higher sPD-L1 levels (≥19.18 pg/mL) tended to be associated with liver-related mortality (hazard ratio 6.866; 95% confidence interval, 0.804-58.659, P=0.078). sPD-1 levels of patients treated with nivolumab as a second-line therapy changed serially, and a >50% reduction in sPD-1 levels was observed immediately after nivolumab administration. However, sPD-1 level was not associated directly with prognosis in patients with advanced HCC.
Conclusions The results demonstrated that PD-L1 and PD-1 levels changed according to the immunotherapy. However, no significant association with clinical outcome in patients with HCC was detected.
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