Abstract
Aims: The mechanisms involved in mycosis fungoides (MF) progression from early to advanced stages have not been completely clarified. In a previous experience, an increase in myeloid derived suppressor cells (MDSCs) was observed comparing patches/plaques to tumours. MDSCs are a heterogeneous group of cells whose antitumor response has been related to the activity of the immune checkpoints, such as programmed death-1 (PD-1) and its ligand (PD-L1), whose function is to physiologically depress immune cell response avoiding autoimmune phenomena. It has been hypothesised that the same mechanism is used by neoplastic cells to depress the anti-tumour response, gaining tumour advantages. Recently, immune checkpoint inhibitors have become available, changing the therapeutic scenarios in different types of cancer. Few data are present in the literature on PD-1 and PD-L1 expression in MF, mostly showing heterogeneous results. The aim of the present study was to assess immune checkpoint expression and role in MF.
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