ADORA3 and urinary bladder carcinoma: Given that MAPKs play a major role in both proliferation and cell death, including ferroptosis [19], and considering that the truncated thio‐Cl‐IB‐MECA, an A3AR antagonist, strongly induces phosphorylation of ERK in T24 human bladder cancer cells [20], we wanted to ascertain whether we also had similar activation in our system.