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. Here, LRPPRC is linked to urinary bladder carcinoma.