Expression of Programmed Death-1 in Primary Cutaneous CD4-Positive Small/Medium-Sized Pleomorphic T-Cell Lymphoma, Cutaneous Pseudo-T-Cell Lymphoma, and Other Types of Cutaneous T-Cell Lymphoma

In this study we investigated whether programmed death-1 (PD-1) could serve as a useful diagnostic marker to differentiate between primary cutaneous CD4+ small/medium-sized pleomorphic T-cell lymphoma (PCSM-TCL) and cutaneous pseudo-T-cell lymphomas on the one hand and other types of cutaneous T-cel