Sixteen GABA receptors: GABRA1, GABRA2, GABRA3, GABRA4, GABRA5, GABRA6, GABRB1, GABRB2, GABRB3, GABRD, GABRE, GABRG1, GABRG2, GABRG3, GABRP and GABRQ were examined by TCGA database analysis (Fig. 3A–P), out of which 2 receptors, GABRA3 and GABRD (Fig. 3C, J), emerged with significant upregulation in breast carcinoma tissues compared to corresponding receptors in normal breast tissues (* p < 0.05; ** p < 0.01). This evidence concerns the gene GABRG2 and breast carcinoma.