@misc{oai:niigata-u.repo.nii.ac.jp:00033843, author = {Yuki, Akihiko}, month = {2020-06-10, 2020-06-10}, note = {Background: Mycosis fungoides (MF) is the most common cutaneous T-cell lymphoma. Early-stage MF patches or plaques often resemble inflammatory skin disorders (ISDs), including psoriasis and atopic dermatitis. Cell adhesion molecule 1 gene (CADM1), which was initially identified as a tumor suppressor gene in human non-small cell lung cancer, has been reported as a diagnostic marker for adult T-cell leukemia/lymphoma. Objective: We investigated CADM1 expression in MF neoplastic cells, especially during early stages, and evaluated its usefulness as a diagnostic marker for MF. Methods: We conducted a retrospective study by using immunohistochemical staining and confirmed the expression of CADM1 in MF. In addition, we compared CADM1 messenger RNA expression in microdissected MF samples and ISD samples. Results: In the overall study period, 55 of 58 MF samples (94.8%) stained positive for CADM1. None of the 50 ISD samples showed positive reactivity (P<.0001). We found CADM1 messenger RNA expression in the intradermal lymphocytes of patients with MF but not in those of patients with an ISD. Limitations: We did not conduct a validation study for MF cases in other institutions. Conclusions: CADM1-positive cells can be identified in early stages with fewer infiltrating cells and may be useful as a diagnostic marker for early-stage MF. (J Am Acad Dermatol 2018;79:1039-46.), J Am Acad Dermatol. 2018, 79(6), 1039-1046., 新大院博(医)甲第887号}, title = {CADM1 is a diagnostic marker in early-stage mycosis fungoides : Multicenter study of 58 cases}, year = {} }