ARID1A and neoplasm: Nevertheless, Zhao et al77 demonstrated that, in the case of stromal antigen 1 (STAG1) down‐regulation, ARID1A exerted its tumour suppressor function through preserving genomic stability by reducing telomere cohesion; as a result, ARID1A inactivation allowed for the elimination of cells with severe genomic instability during mitosis.