[Current status of lymph node dissection in pyloric-preserving gastrectomy for early gastric cancer].

With the gradual increase in the diagnosis rate of early gastric cancer, clinicians must consider prevention of gastric anatomical structure and physiological function while ensuring the radical treatment of the tumor. Pylorus-preserving gastrectomy is a function- preserving operation that preserves the pylorus, inferior pyloric vessel, and the vagus nerve in patients with early middle gastric cancer. One of the major controversies at present is the thoroughness of limited lymph node dissection for pyloric-preserving gastrectomy. Various studies have reported that the lymph node metastasis rate of early middle gastric cancer was low, especially in the suprapyloric region, inferior pylorus and the upper pancreatic region. Partial lymph node dissection is required for vascular and neurological protection, which is also safe and feasible in studies reported by major centers. Many clinical studies have been carried out in Japan and Korea, and postoperative follow-up has gradually increased evidence, providing the basis for the safety of lymph node dissection. In large case studies comparing pylorus- preserving gastrectomy with traditional distal gastrectomy, the incidence of postoperative morbidity, such as dumping syndrome, bile reflux esophagitis, weight loss, and malnutrition is low. Sentinel lymph node navigation technology is gradually applied to the diagnosis and treatment of early gastric cancer, and its clinical application value still needs further research.随着早期胃癌诊断率逐渐上升，在确保肿瘤根治性的前提下，更好地保留胃的解剖结构和生理功能是临床医生必须要考虑的。保留幽门胃切除术是一种对早期胃中部癌患者进行的保留幽门、幽门下血管及迷走神经的功能保留手术。目前主要的争议之一，是对保留幽门胃切除术淋巴结有限清扫的彻底性。各项研究报道，早期胃中部癌淋巴结转移率相对较低，尤其是幽门上下区及胰腺上区淋巴结的转移。此外，对于血管和神经的保护，需要牺牲部分淋巴结的清扫，这在各大中心的研究报道中，也是安全可行的。日本和韩国已开展大量的临床研究，术后随访及循证医学方面的证据逐渐增加，为淋巴结清扫的安全性提供依据。有关保留幽门胃切除术与传统的远端胃切除术比较的大宗病例研究中报道，其术后倾倒综合征、胆汁反流性胃食管炎、体质量减轻、营养不足等发生率较低。同时，前哨淋巴结导航技术正逐步应用于早期胃癌的诊治，其临床应用的价值仍需进一步的临床研究。.