In 2017, Li (72) detected the expression of P-glycoprotein (P-gp), glutathione S-transferase-π (GST-π), topoisomerase II (topo II), multidrug resistance gene-associated protein (MRP), lung resistance-related protein (LRP), Ki-67, and p53 in cancer tissues of 93 elderly patients with AGEJ (adenocarcinoma of gastroesophageal junction) before NACT and then analyzed the relationship between the expression of these proteins and the curative effect of NACT. Here, MVP is linked to gastroesophageal junction adenocarcinoma.