Skin lesions of CTCL patients show overexpression of IL-15 protein (Leroy et al., 2001), and IL-15 has been implicated in CTCL cell growth and survival in vitro (Döbbeling et al., 1998; Marzec et al., 2008). The gene discussed is IL15; the disease is primary cutaneous T-cell non-Hodgkin lymphoma.