The authors collected a cohort of 23 breast tumors that were fully characterized by TCGA (15/23 cases being LumA/LumB subtypes, 8/23 being Basal/Her2 subtypes), and they further analyzed the metabolome of these tumors by gas-chromatography/mass spectroscopy (GC/MS) and liquid-chromatography/mass spectroscopy (LC/MS), which included both glucose and lactate. Here, ERBB2 is linked to breast neoplasm.