MAPK8 and hepatocellular carcinoma: To further explore the roles of these MAPKs in ARV-771-induced proliferation suppression, cell viability assays were performed in HCC cells post ARV-771 exposure with or without the addition of LY3214996 (an ERK inhibitor), SB230580 (a p38 inhibitor), or SP600125 (a JNK inhibitor).