title: Overestimated Oncologic Significance of Lymph Node Metastasis in G1 Nonfunctioning Neuroendocrine Tumor in the Left Side of the Pancreas.
abstract: Recent studies have expounded on the oncologic significance of lymph node metastasis in nonfunctioning (NF) neuroendocrine tumors (NETs) of the pancreas and suggest regional lymph node dissection for treating pancreatic NET. We tested this recommendation in NF pancreatic NET-G1, as these tumors are generally small and suitable for function-preserving minimally invasive pancreatectomy.From January 2005 to December 2014, medical records of patients who underwent pancreatectomy for pathologically confirmed NF NET-G1 of the left side of the pancreas were retrospectively reviewed. Oncologic outcomes were compared between limited pancreatectomy and distal pancreatosplenectomy.Thirty-five patients (14 males and 21 females) with a mean age of 55.9 ± 11.4 years were enrolled in this study. Six patients (17.1%) underwent distal pancreatosplenectomy. Limited pancreatectomies comprised 15 spleen-preserving distal pancreatectomies (42.8%), 10 enucleations (28.6%), and 4 central pancreatectomies (11.4%). Lymph node metastasis was not found in 6 patients who underwent distal pancreatectomy with a splenectomy; meanwhile, the others were regarded as pNx since no lymph node retrieval was attempted during the limited pancreatectomy. Overall disease-free survival was 36.5 months (95% confidence interval [CI]: 25.9-47.1) and no tumor-related mortality was noted. Minimally invasive pancreatectomy (P = 0.557) and limited pancreatectomy (P = 0.758) showed no adverse impact in treating NF NET-G1 of the left side of the pancreas.The oncologic significance of lymph node metastasis is overestimated in NF NET-G1 of the left side of the pancreas. Routine conventional distal pancreatosplenectomy to retrieve regional lymph nodes may be too excessive in treating NF NET-G1 of the distal pancreas.
authors.affiliation: From the Department of Hepatobiliary and Pancreatic Surgery, Yonsei University College of Medicine (YJY, SJY, HKH, CMK, WJL); Department of Pathology, Yonsei University College of Medicine (HK); and Pancreaticobiliary Cancer Clinic, Yonsei Cancer Center, Severance Hospital, Seoul, Korea (SJY, HKH, CMK, HK, WJL).
authors.forename: Young Jin
authors.initials: YJ
authors.lastname: Yoo
authors.forename: Seok Jeong
authors.initials: SJ
authors.lastname: Yang
authors.forename: Ho Kyoung
authors.initials: HK
authors.lastname: Hwang
authors.forename: Chang Moo
authors.initials: CM
authors.lastname: Kang
authors.forename: Hogeun
authors.initials: H
authors.lastname: Kim
authors.forename: Woo Jung
authors.initials: WJ
authors.lastname: Lee
mesh_terms: D000328:Adult; D000368:Aged; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D008197:Lymph Node Excision / Q000379:methods / Q000706:statistics & numerical data; D008198:Lymph Nodes / Q000473:pathology / Q000601:surgery; D008207:Lymphatic Metastasis / Q000175:diagnosis*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D018358:Neuroendocrine Tumors / Q000453:epidemiology / Q000473:pathology / Q000503:physiopathology / Q000601:surgery; D010179:Pancreas / Q000473:pathology*; D010180:Pancreatectomy / Q000379:methods / Q000706:statistics & numerical data; D010190:Pancreatic Neoplasms / Q000453:epidemiology / Q000473:pathology / Q000503:physiopathology / Q000601:surgery; D056910:Republic of Korea / Q000453:epidemiology; D012189:Retrospective Studies; D013156:Splenectomy; D019564:Unnecessary Procedures / Q000706:statistics & numerical data