ABCG2 and cancer: 3β-Hydroxycholest-5-en-26-oic acid and stearic acid showed up-regulation in the SCC group, but aconitic acid,behenic acid,and glucose-6-phosphate were down-regulated (Table S3).Furthermore, the differential metabolites in ADC patients relative to SCC are mainly involved in ABC transporters and carbon metabolism in cancer is closely related (Figure S3C).