FCGR1A and prostate cancer: U937 monocytic (pre-macrophage) cell line was implemented in cell-based experiments as the FcγRI/CD64-positive cell line that has been used in several studies as a phagocyting human model cell line [53,54], while prostate cancer-derived PC3-PIP and PC3 cells were used as representatives of PSMA-positive and PSMA-negative cells, respectively [55,56].