TOX and primary cutaneous T-cell non-Hodgkin lymphoma: This study demonstrates that TOX is not only expressed by neoplastic T-cells in CTCL, but also by follicle center cells in all reactive follicles in lymph nodes, tonsils, CLH, and PCMZL, and by neoplastic follicle center cells in 16/17 PCFCL, and 7/7 secondary cutaneous FL.