ABCG2 and cancer: As a result, a total of 11 KEGG items were significantly enriched by the differentially expressed metabolites, including hsa01100: metabolic Homo sapiens, hsa‐02010: ABC transporters‐Homo sapiens, hsa05230: Central carbon metabolism in cancer—Homo sapiens, hsa00020: Citrate cycle (TCA cycle) ‐ Homo sapiens, hsa00250: Alanine, aspartate, and glutamate metabolism—Homo sapiens (Table 1).