Figure 4. The expression of immune-related factors in subtypes C1 and C2. Boxplots of FPKM values for the expression of receptors (A), immune inhibitors (B), immunostimulants (C), and chemokines (D and E) in different subtypes. *P < 0.05, **P < 0.01, ***P < 0.001, ****P < 0.0001.