Compared with nontumor tissues, GC tumor tissues exhibited overexpression of NKX2‐1‐AS1 (P = 0.0001) and SERPINE1 expression (P = 0.0004) and downregulation of miR145‐5p expression (P = 0.0033; Fig. 2A–C). The gene discussed is NKX2-1; the disease is gastric cancer.