PTEN and neoplasm: The tumour suppressor PTEN is a dual specificity phosphatase regulating both protein tyrosine dephosphorylation (Tamura et al, 1998) and dephosphorylation of the 3‐positions of phosphatidyl‐inositol‐3,4,5‐tris‐phosphate (PI(3,4,5)P3, PIP3; Maehama & Dixon, 1998) and phosphatidyl‐inositol‐3,4‐bis‐phosphate (PI(3,4)P2; Malek et al, 2017).