Spearman correlation between HCC tumors and all cancer cell lines (a) individual pairs (b) grouped by cell line primary site. In the heatmap, each row represents one tumor sample; each column represents one cell line. The correlation level is represented by color: higher correlation shown in red, lower in yellow. The HCC cell lines are labeled in green. In the boxplot, each dot represents the correlation between one tumor sample and one cell line and the red line is the median.