By contrast, LILRB4 was not detected in lung cancer (0/100), breast cancer (0/90), esophageal cancer (0/90), endometrial cancer (0/100), brain tumor (0/45), thyroid cancer (0/40), colorectal cancer (0/90), pancreatic cancer (0/80) and head and neck cancer (0/19) (Supplementary Fig. S1D-L). This evidence concerns the gene LILRB4 and head and neck cancer.