GRK1 and melanoma: In terms of “cell viability”, the effects of G-Rk1 on cell viability of HepG2 cells, SNU449, SNU182, SK-Hep-1, SK-Mel-2, Hela, HCT-116, MCF-7, PANC-1, A549, and human malignant melanoma was found significantly in a dose-dependent manner (Kim et al., 2012; Kim et al., 2008; Ko et al., 2009; Kwak & Pyo, 2016; Quan et al., 2015).