Conversely, the expression of SLC16A1 and SLC16A7 genes (Supplementary Fig. S2C, D)—encoding MCT1 and MCT2 lactate transporters, respectively—as well as of GJA1 (data not shown) encoding connexin 43 and responsible of lactate diffusion [48], does not differ between the two tumour subtypes. This evidence concerns the gene GJA1 and neoplasm.