Fig. 1

H&E and IHC of the cell membrane in clear cell RCC show the status of ABCG2 (10 × 20). a H&E staining of the RCC case. b RCC was ABCG2(−), no membrane staining could be seen. c RCC was ABCG2(+), weak membrane staining. d RCC was ABCG2(++), moderate to strong membrane staining. e Scale bar = 50 μm, and f. Scale Bar = 200 μm