Regarding CTCL, the most common histology was mycosis fungoides/Sézary syndrome (MF/SS, N = 14) followed by primary cutaneous anaplastic large cell lymphoma (pcALCL, N = 6) and CD4+ small/medium cell primary cutaneous lymphoma (pcSMPTCL, N = 5). This evidence concerns the gene CD4 and mycosis fungoides.