ABCG2 and cancer: Galactose metabolism, protein digestion and absorption, 2-monocarboxylic acid metabolism, pantothenic acid metabolism, and CoA biosynthesis metabolism were significantly upregulated, while glycine, serine, and threonine metabolism, arginine synthesis metabolism, alanine, aspartic acid, and glutamic acid metabolism, cancer center carbon metabolism, mineral metabolism, amino acid synthesis metabolism, ABC transporter, thiamine metabolism, β-alanine metabolism, purine and pyrimidine metabolism, and amino acyl-tRNA biosynthesis metabolism were downregulated (Figure 5B, Supplementary Table S6).