This included the DNA-binding protein TOX, which has been proposed as a potential but not exclusive marker for CTCL54, and GTSF1, a protein with a function in T cells that is unknown and previously identified in some CTCL cancer cell lines55, and the presence of B cells in CTCL skin. The gene discussed is GTSF1; the disease is primary cutaneous T-cell non-Hodgkin lymphoma.