Correlation analysis between PD-1/PD-L1 and CD4, CD8 expression (Table 2)
The correlations between the expressions of PD-1, PD-L1 and CD4, CD8 were analyzed using the Chi-squared test (Table 2). Among the 24 patients, 9 cases were PD-1 positive and 15 cases were negative; 17 cases were PD-L1 positive and 7 cases were negative. The expression of CD4 and CD8 was positively correlated with the expression of PD-L1 (Pearson correlation coefficient r = 0.451, P = 0.027).