Among mature T-cell and NK-cell lymphomas, the most prevalent subtype was mycosis fungoides (MF) (n = 42), followed by Sezary syndrome (SS) (n = 10), primary cutaneous anaplastic large cell lymphoma (ALCL) (n = 4), primary cutaneous aggressive epidermotropic CD8+ cytotoxic T-cell lymphoma, provisional (n = 3) and primary cutaneous CD4+ small/medium pleomorphic T-cell lymphoma (SMPTCL) (n = 2), and subcutaneous panniculitis-like T-cell lymphoma (SPTL) (n = 2). This evidence concerns the gene CD8A and Sezary syndrome.