For example, sinnamaldehyde, a compound in Cortex Cinnamomi (Rou Gui), was indicated to upregulate antigen processing and MHC biosynthesis related genes, as shown in Figure 3B. Additionally, as demonstrated in Figure 3B, some compounds that may enhance the NK cell activities may also improve the levels of antigen processing and presentation in tumor cells. This evidence concerns the gene HLA-C and neoplasm.