MADCAM1 and neoplasm: Tumor ECs upregulate adhesion molecules, such as stabilin‐1 (STAB1, also known as CLEVER1) mucosal vascular addressin cell adhesion molecule 1 (MADCAM1), and activated leukocyte cell adhesion molecule (CD166), that selectively promote the infiltration of regulatory T cells, which secrete immunosuppressive cytokines.36, 37