Yuki et al. [12] revealed that 55 of 58 MF cases, including 34 early MF cases, showed CADM1 expression in more than 5% of neoplastic lymphocytes, while CADM1 expression was found in less than 5% of non-neoplastic lymphocytes in all 50 biopsies of inflammatory dermatoses. The gene discussed is CADM1; the disease is mycosis fungoides.