title: The risk of lymph node metastasis based on myometrial invasion and tumor grade in endometrioid uterine cancers: a multicenter, retrospective Korean study.
abstract: BACKGROUND
  Knowledge of the risk factors for lymph node metastasis (LNM) is necessary to treat patients with endometrioid uterine cancer to optimize and further individualize treatment. This study was designed to determine the risk of LNM based on myometrial invasion and tumor grade in endometrioid uterine cancer.
  
  
  METHODS
  The authors retrospectively reviewed the medical records and pathological findings of 834 patients who underwent surgical staging, including pelvic lymphadenectomy with or without para-aortic lymphadenectomy, for endometrioid uterine cancer from 2002 to 2008 in Korea.
  
  
  RESULTS
  Of the 834 patients with endometrioid uterine cancer, 107 (12.8%) patients had LNM. Sixty-one (57%) patients had only pelvic LNM, 39 (36.4%) had pelvic and para-aortic LNM, and 7 (6.6%) had isolated para-aortic LNM. Tumor grade, myometrial invasion, tumor diameter, cervical extension, lymphovascular space invasion, and adnexal involvement were found to be significant predictors of LNM. Of 215 patients with no myometrial invasion and tumor grade I/II, only 1 (0.47%) had LNM. However, in other patients, the risk of LNM was significant and at least > 3.5%. Furthermore, the risk of LNM was found to be well correlated with increases in myometrial invasion and tumor grade based on subgroup analyses, when patients with no myometrial invasion and tumor grade I/II were used as a reference group (p < 0.0001).
  
  
  CONCLUSIONS
  Patients with endometrioid uterine cancers with no myometrial invasion and tumor grade I/II might have minimal risk of LNM, whereas others might require complete pelvic and para-aortic lymphadenectomy for surgical staging.
authors.affiliation: Department of Obstetrics and Gynecology, Gil Medical Center, Gachon University of Medicine and Science, Incheon, South Korea.
authors.forename: Kwang-Beom
authors.initials: KB
authors.lastname: Lee
authors.forename: Kyung-Do
authors.initials: KD
authors.lastname: Ki
authors.forename: Jong-Min
authors.initials: JM
authors.lastname: Lee
authors.forename: Jae-Kwan
authors.initials: JK
authors.lastname: Lee
authors.forename: Jae Weon
authors.initials: JW
authors.lastname: Kim
authors.forename: Chi-Heum
authors.initials: CH
authors.lastname: Cho
authors.forename: Seok-Mo
authors.initials: SM
authors.lastname: Kim
authors.forename: Sang-Yoon
authors.initials: SY
authors.lastname: Park
authors.forename: Dae-Hoon
authors.initials: DH
authors.lastname: Jeong
authors.forename: Ki-Tae
authors.initials: KT
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016889:Endometrial Neoplasms / Q000473:pathology* / Q000601:surgery; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007723:Korea; D008197:Lymph Node Excision; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009215:Myometrium / Q000473:pathology* / Q000601:surgery; D009367:Neoplasm Staging; D011379:Prognosis; D012189:Retrospective Studies; D012307:Risk Factors; D015996:Survival Rate; D016896:Treatment Outcome; D055815:Young Adult