CD68 and neoplasm: The infiltration of CD68+ macrophages in mammary tumors of the IT group suggested that exposure to non-contact electric fields of ECCT may direct macrophages, likely of the M1 phenotype, to the tumor areas11,21 and then engulf and digest dead cell, debris and tumor cells12,67 that eventually produced hollow cavities54,55 as seen inFigure 7b.