MKI67 and neoplasm: d and e HE staining shows that the peritoneal metastasis consists of the small tumor cell component that was also found in the tumor tissue of the kidney (d: bar = 1000 μm; e: bar = 50 μm) f and g Ki-67 staining reveals a very high proliferation index in the small cell component of the peritoneal metastasis (f) as well as the small cell component of the kidney tumor (g) (f: bar = 50 μm, g: bar = 100 μm).