Analysis of NET-DNA levels in the plasma of healthy volunteers and gastric cancer patients via enzyme-linked immunosorbent assays revealed higher levels of cit-H3-DNA and MPO-DNA in the plasma of the gastric cancer patients than in the healthy individuals and higher NET-DNA deposition in patients with stage III gastric cancer than in patients with stage I and II gastric cancer (Fig. 1a, b). The gene discussed is MPO; the disease is gastric cancer.