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OPLS-DA scores plots and loadings plots of 55 HCC patients (red dots) and 47 healthy controls (blue squares) based on serum spectral data of (A) GC-TOFMS; (B) UPLC-QTOFMS positive ion mode; and (C) UPLC-QTOFMS negative ion mode. On the right side of the three scores plots, three representative chromatograms of a HCC (red) and a healthy control sample (blue) derived from GC-TOFMS, UPLC-QTOFMS positive ion mode, and negative ion mode, respectively.
