ADRA2A and neoplasm: Next, we analyzed the expression of main NE and EPI receptors, adrenergic receptors (ARs) in tumor sites, including α-adrenoceptor (α1-AR or ADRA1, α2-AR, or ADRA2) and β-adrenoceptors (β1-AR or ADRB1, β2-AR or ADRB2, β3-AR or ADRB3).