To further investigate the function of PTPN4 in ovarian cancer, the SKOV3 and OVCAR3 cells were transfected with an empty vector, PTPN4‐WT, or PTPN4‐Mut vector (without NLS) and the efficiency was determined by Western blot (Figure 5A). The gene discussed is PTPN4; the disease is ovarian carcinoma.