Figure 2
OPLS-DA score plots based on the data from (A,C) LC-(+)ESI-MS and (B,D) LC-(−)ESI-MS of ESCC patients and healthy controls. 
, early-stage ESCC patients (T1–2); 
, advanced-stage ESCC patients (T3–4); and 
, controls.
Figure 2 | Scientific Reports
