IL27 and neoplasm: While IFN-g is generally thought to be the primary T cell derived cytokine responsible for adaptive PD-L1 expression, we have described several additional TME-resident cytokines that can upregulate PD-L1 expression on cultured human monocytes (Monos) and/or tumor cells, including IL-1a, IL-10, IL-27 and IL-32 g [13–15].