MAPK3 and cancer: Moreover, A1R (337, 355), A2AR (341, 356), A2BR (344, 357–359), and A3R (343, 360) stimulation augments cancer cell proliferation through activation of PLC (356), protein kinase C-delta (PKC-δ) (356), AKT (356, 357), ERK1/2 (356–360), JNK (356, 358), and p38 (358).