GRK5 and breast cancer: GRK5 plays oncogenic roles in GBM, prostate, pancreas, renal cell, non-small-cell lung, and breast cancers (Kim et al., 2012; Gambardella et al., 2016; Komolov et al., 2017; Jiang et al., 2018; Yang et al., 2018; Alshabi et al., 2019; Zhao et al., 2019a; Zhao et al., 2019b; Lagman et al., 2019; Sommer et al., 2019).