HK2 and cancer: YAP plays a vital role in its downstream targets lncRNA breast cancer antiestrogen resistance 4 (lncRNA BCRA4), which contributes to the transcription of two glycolysis activators, hexokinase 2 (HK2) and 6‐phosphofructo‐2‐kinase (PFKFB3), and then promotes the YAP‐dependent glycolysis in turn.147