QKI and urinary bladder cancer: Although cell proliferation was reduced after QKI‐6 overexpression and knockdown, addition of PDTC showed that the OD450 value was not statistically different between the vector and QKI‐6 cDNA‐transfected T24 cells or between the sh‐NC and sh‐QKI‐6‐transfected 5637 cells (Figure 9G,H), also indicting that PDTC treatment abolished the effects of QKI‐6 on these bladder cancer cells.