PTK2 and ovarian cancer: In addition, a recent study indicated that VEGFR2 could be regulated through programmed death ligand-1 (PD-L1) in ovarian cancer [52], and our recent study and another study also found that PD-L1 could be regulated by FAK [21,22], suggesting that VEGFR2 might be regulated through FAK/PD-L1 axis.