PDYN and POEMS syndrome: POEMS syndrome patients had serum lipids different from healthy controls enriched in the following 9 pathways: de novo fatty acid biosynthesis, vitamin E metabolism, C21‐steroid hormone biosynthesis and metabolism, bile acid biosynthesis, fatty acid activation, xenobiotics metabolism, dynorphin metabolism, vitamin D3 (cholecalciferol) metabolism and glycerophospholipid metabolism.