title: Analysis of risk factors for persistent gestational trophoblastic disease.
abstract: METHODS
  Persistent disease is a serious consequence of molar pregnancies. Its early detection is critical to effective chemotherapy. Therefore, determination of risk becomes an important clinical decision.
  
  
  OBJECTIVE
  To determine the relative risk of persistent disease in a cohort of patients with partial and complete molar pregnancies by analysis of five factors derived from a database using multivariate analysis.
  
  
  RESULTS
  Of 686 patients, 78 developed persistent disease which required treatment (rate of 11.3%). Risk was markedly increased when serum human chorionic gonadotrophin (HCG) failed to reach negative by 12 weeks after evacuation [hazard ratio (HR) = 120.78, P < 0.001]. Risk was markedly decreased when the interval from last pregnancy exceeded 12 months (HR = 0.24, P = 0.005). Other factors such as patient's age, stage of gestation and serum HCG level at presentation were not found to be strongly associated with risk of persistent disease.
  
  
  CONCLUSIONS
  These findings support the application of the following two factors in risk prediction for molar pregnancies: > 12 weeks to become HCG negative and interval from last pregnancy < 12 months. They will contribute to a greater awareness of persistent disease and assist in early detection and effective chemotherapy.
authors.affiliation: Betty Byrne Henderson Women's Health Research Centre, University of Queensland, Brisbane, Queensland, Australia. s.khoo@uq.edu.au
authors.forename: Soo-Keat
authors.initials: SK
authors.lastname: Khoo
authors.forename: David
authors.initials: D
authors.lastname: Baartz
authors.forename: Mukhtiar
authors.initials: M
authors.lastname: Sidhu
authors.forename: Wai-Lum
authors.initials: WL
authors.lastname: Yip
authors.forename: Lee
authors.initials: L
authors.lastname: Tripcony
mesh_terms: D000328:Adult; D000367:Age Factors; D006063:Chorionic Gonadotropin / Q000097:blood; D015331:Cohort Studies; D005260:Female; D005865:Gestational Age; D006801:Humans; D006828:Hydatidiform Mole / Q000175:diagnosis* / Q000209:etiology* / Q000628:therapy; D018365:Neoplasm, Residual; D011247:Pregnancy; D012189:Retrospective Studies; D012307:Risk Factors; D013997:Time Factors; D014594:Uterine Neoplasms / Q000175:diagnosis* / Q000209:etiology* / Q000628:therapy; D055815:Young Adult
chemical_list: D006063:Chorionic Gonadotropin