CD4 and primary cutaneous T-cell non-Hodgkin lymphoma: While there are multiple clinical subtypes of CTCL, this study was focused on MF, because (a) MF is the most common form of CTCL (81); (b) the CD4+ Myla cell line used in this study was from a patient with MF; and (c) itch severely impairs the quality of life of patients with MF (82).