ID3 and urinary bladder cancer: Coatomer protein complex subunit α facilitates the transport of the cargo protein LRPPRC across the Golgi complex and enhances its stability, thereby increasing LRPPRC expression; LRPPRC promotes the stability of ID3 mRNA in an m6A‐dependent manner, thereby decreasing the transcriptional activity of p16 and p21, which leads to increased erdafitinib resistance in FGFR‐altered bladder cancer.