CD70 and neoplasm: The high accumulation of 227Th in the tumor is driven by (a) the binding properties of the non-mouse cross-reactive CD70 antibody-chelator conjugate combined with (b) the high levels of CD70 target expression in this model (c) low levels of necrosis (ranging from not detectable to 14 %) and (d) high vascularity of the tumors (MVD ∼ 324/mm2).