CD274 and neoplasm: We assessed p-STAT3 and p-STAT6 in macrophages in the setting of the tumor microenvironment treated with or without amphotericin B. In our results, p-STAT3 and B7-H1 protein expression levels were not consistent; implying that the constitutive expression of B7-H1 in macrophages is independent of the STAT3 signaling pathway.