IL4 and primary cutaneous T-cell non-Hodgkin lymphoma: The authors further addressed how treatment with a variety of modalities, including UVB phototherapy, extracorporal photopheresis, low-dose alemtuzumab, and systemic chemotherapy with gemcitabine influenced the frequency of benign T cells expressing IFN-γ and IL-4 in leukemic CTCL patients [76].