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Additional file 1: Supplementary Figure 1. Identification and distribution of lipid components. (A) Numbers of lipid species in lipid classes/subclasses detected by lipidomics analysis. Circular diagram of lipid subclass composition in non-metastatic group (B) and metastatic group (C). Supplementary Figure 2. The overlapped total ion chromatogram (TIC) of the plasma mixtures in negative and positive modes. Supplementary Table 1. Information of the instrument used in lipidomics analyses. Supplementary Table 2. Information of the reagents and internal standards used in lipidomics analyses. Supplementary Table 3. 655 unique lipids were identified and quantified. Supplementary Table 4. Baseline characteristics of patients in the training set and validation set. Supplementary Table 5. Associations of lipid species with distant metastasis-free survival (DMFS) of Nasopharyngeal carcinoma (NPC) by univariate Cox regression analysis. Only the lipid species with P value