Several studies reported that in cancer or inflammatory diseases, RDW level was closely related to proinflammatory cytokines such as interleukin-6, tumor necrosis factor alpha, and cytokeratin 19 fragment, and inflammatory biomarkers including erythrocyte sedimentation rate (ESR) and C-reactive Protein (CRP) [18,19,20]. The gene discussed is KRT19; the disease is cancer.