PPARA and retinopathy of prematurity: Taken together, we speculate that the increased levels of nervonic acid, linoleic acid, N-methyl-2-oxoglutaramate, N1-acetylspermine, and fructosyllysine, and reduced levels of prostaglandin F3a, iodiconazole, N-acetylhistamine, 1-phenyl-1-propanol, and 3-hydroxy-5,8-tetradecadienoylcarnitine may be closely associated with ROP progression, and the enriched pathways of steroid hormone biosynthesis, PPAR signaling, linoleic acid metabolism, histidine metabolism, and alanine, aspartate, and glutamate metabolism.