Lymphadenectomy in pancreaticoduodenectomy In 2014, the consensus conference of the International Study Group of Pancreatic Surgery (ISGPS) applied the nomenclature of the Japan Pancreas Society and gave the definition of standard lymphadenectomy in pancreaticoduodenectomy as removal of the lymph node (LN) groups 5, 6, 8a, 12b1, 12b2, 12c, 13a, 13b, 14a right lateral side, 14b right lateral side, 17a, 17b.