However, studies have found that antigen-presenting cells, including dendritic cells with the strongest presenting ability, are defective in the presentation of tumor antigens, which frees tumor cells from sanction, that is, “immune escape.” The related mechanism is that tumor cells release some factors, such as VEGF, that prevent the maturation of dendritic cells, thereby preventing dendritic cells from contacting T cells and cutting off the process of antigen presentation. Here, VEGFA is linked to neoplasm.