Figure 1

Score plots of OPLS-DA models (A,B); Validation plots of the PLS-DA models (C,D) and T-predicted scatter plots (E,F) of OPLS-DA model based on the data from LC-(+)ESI-MS (A,C,E) and LC-(−)ESI-MS (B,D,F). (, ESCC patients; , controls; , ESCC patient prediction set; and , control prediction set).