Gambichler et al. performed an immunohistochemical study, analyzing the expression of CEACAM1 in benign and malignant cutaneous tumors and in normal peritumoral skin: benign nevi (42 cases), dysplastic nevi (22 cases), thin superficial spreading melanomas (21 cases), and thick superficial spreading melanomas (21 cases). Here, CEACAM1 is linked to dysplastic nevus.