The most commonly contemporaneously-expressed transcripts within individual tumors are GABRA3, GABRA5, GABRB2, GABRB3, GABRG1, GABRD, and GABRE—encoding the α3, α5, β2, β3, γ1, δ, and ε subunits, respectively—with the vast majority of all ACC tumors expressing transcripts encoding both δ and ε subunits. This evidence concerns the gene GABRB3 and adrenal cortex carcinoma.