MPO and gastric cancer: Kaplan-Meier survival curves were obtained in the KM plots database to characterize the correlation of myeloperoxidase (MPO), a marker for neutrophils that has been reported in many human cancers and diseases [22–27], with GC prognosis, which showed that a higher level of MPO in GC tumors associated with poorer overall survival of patients with GC (Figure 1(a)).