PECAM1 and lymphoma: In 2014, Yi et al. reported on an RNFP in the lesser curvature of the fundus attached to the left adrenal gland with obscure boundaries. Immunohistochemically, the biopsy specimen was positive for CK and M-CEA in the glandular epithelium, positive for CD31 and CD34 in the vascular endothelium, and positive for CD3 and L26 in small lymphocytes; therefore, lymphoma and gastric cancer were excluded [12].