CTLA4 and neoplasm: Although the expression difference could be detected between the two subtypes, they were always more stably expressed in tumor samples than those in normal samples (the total fold change was 0.88, p = 0.8672) (Figure 2D,E), and only CTLA4 showed higher expression in tumor samples (FC = 1.96, p = 7.57 × 10−6).