MBNL1 and breast cancer: (a) Muscleblind‐like 1 antisense RNA 1 (MBNL1‐AS1) suppresses bladder cancer (BC) cell proliferation, (b) MBNL1‐AS1 promotes BC cell apoptosis, and (c) MBNL1‐AS1 regulates BC progression via miR‐135a‐5p/PHLPP2/FOXO1 axis.