BIRC5 and renal cell carcinoma: Dual‐luciferase reporter gene assay showed that the luciferase activity of the group co‐transfected with miR‐203 mimics and BIRC5‐wt was lower than that of the group co‐transfected with miR‐203 NC and BIRC5‐wt (Figure 2B, **P < 0.01), whereas co‐transfection with BIRC5‐mut did not affect luciferase activity, indicating that miR‐203 directly binds to BIRC5 in RCC.