PPARA and cancer: Phenylalanine metabolism contained phenylacetylglutamine, 2-hydroxycinnamic acid, N-acetyl-L-phenylalanine, phenylacetylglycine; PPAR signaling pathway included 8-hydroxy-5Z,9E,11Z,14Z-eicosatetraenoic acid; and choline metabolism in cancer contained PC(18:1(11Z)/18:3(6Z,9Z,12Z)) and LysoPC(18:3(6Z,9Z,12Z)/0:0).