Figure S4 from Evaluating for Correlations between Specific Metabolites in Patients Receiving First-Line or Second-Line Immunotherapy for Metastatic or Recurrent NSCLC: An Exploratory Study Based on Two Cohorts

Principal component analysis (PCA) of the metabolites of Cohort 1 and Cohort 2 under negative (A, C) and positive (B, D) ion modes. Green indicates samples from the long-term survival group, blue indicates samples from the short-term survival group and red indicates QC samples.