As a nutritional factor, we adopted the NRI among various indices in this study because it consists of objective and easily measurable parameters used for follow-up of gastric cancer in outpatient settings and does not require additional measurement (e.g., triceps skin fold, detailed laboratory variable such as C-reactive protein, glycoprotein, prealbumin, and neutrophil/lymphocyte count). The gene discussed is ART4; the disease is gastric cancer.