Fig. 2

Volcano plots of 2595 identified lipid species. Each plot represents a lipid species to be identified. The relative amount of 203 lipid species (red plots) were increased (FC ≥ 2.0 = right side of 1 in the horizontal axis, P-value < 0.05 = 1.30 in vertical axis) and that of 4 lipid species (green plots) were decreased (FC ≤0.05 = left side of − 1 in the horizontal axis, P-value < 0.05 = 1.30 in vertical axis) in the recurrent group. Nine increased lipids showing prominent distributions and all 4 decreased lipid species were annotated for candidate predictors (blue arrows). Abbreviations: Cer, ceramide; ChE, cholesterol ester; FC, folding change; Hex1Cer, monohexosylceramide; LPC, lysophosphatidylcholine; MePC, monoether phosphatidylcholine; PC, phosphatidylcholine; PE, phosphoethanolamine; SM, sphingomyelin; TG, triglyceride