Inclusion Criteria:  Histologically diagnosed ovarian, fallopian tubal, primary peritoneal cancer Patients suspected of metastatic lymph nodes in the cardiophrenic, internal mammary, and/or supraclavicular lymph node by CT (size larger than 5mm) Patients clinically diagnosed FIGO stage IVB ovarian, fallopian tubal, primary peritoneal cancer Patients underwent debulking surgery (primary debulking surgery or interval debulking surgery) at Seoul National University Hospital from January 2010 to January 2020 Patients age 18-90  Exclusion Criteria:  Borderline or benign ovarian disease Patient didn't undergo debulking surgery Non-epithelial ovarian cancer