title: LINE-1 Methylation Patterns as a Predictor of Postmolar Gestational Trophoblastic Neoplasia.
abstract: OBJECTIVE
  To study the potential of long interspersed element-1 (LINE-1) methylation change in the prediction of postmolar gestational trophoblastic neoplasia (GTN).
  
  
  METHODS
  The LINE-1 methylation pattern from first trimester placenta, hydatidiform mole, and malignant trophoblast specimens were compared. Then, hydatidiform mole patients from 11999 to 2010 were classified into the following 2 groups: a remission group and a group that developed postmolar GTN. Specimens were prepared for a methylation study. The methylation levels and percentages of LINE-1 loci were evaluated for their sensitivity, specificity, and accuracy for the prediction of postmolar GTN.
  
  
  RESULTS
  First, 12 placentas, 38 moles, and 19 malignant trophoblast specimens were compared. The hydatidiform mole group had the highest LINE-1 methylation level (p = 0.003) and the (u)C(u)C of LINE-1 increased in the malignant trophoblast group (p ≤ 0.001). One hundred forty-five hydatidiform mole patients were classified as 103 remission and 42 postmolar GTN patients. The %(m)C(u)C and %(u)C(m)C of LINE-1 showed the lowest p value for distinguishing between the two groups (p < 0.001). The combination of the pretreatment β-hCG level (≥100,000 mIU/mL) with the %(m)C(u)C and %(u)C(m)C, sensitivity, specificity, PPV, NPV, and accuracy modified the levels to 60.0%, 92.2%, 77.4%, 83.8%, and 82.3%, respectively.
  
  
  CONCLUSIONS
  A reduction in the partial methylation of LINE-1 occurs early before the clinical appearance of malignant transformation. The %(m)C(u)C and %(u)C(m)C of LINE-1s may be promising markers for monitoring hydatidiform moles before progression to GTN.
authors.affiliation: Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Faculty of Medicine, Chulalongkorn University, King Chulalongkorn Memorial Hospital, Bangkok 10330, Thailand.
authors.forename: Ruangsak
authors.initials: R
authors.lastname: Lertkhachonsuk
authors.affiliation: Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, Faculty of Medicine, Chulalongkorn University, King Chulalongkorn Memorial Hospital, Bangkok 10330, Thailand.
authors.forename: Krissada
authors.initials: K
authors.lastname: Paiwattananupant
authors.affiliation: Division of Gynecologic Pathology, Department of Obstetrics and Gynecology, Faculty of Medicine, Chulalongkorn University, King Chulalongkorn Memorial Hospital, Bangkok 10330, Thailand.
authors.forename: Patou
authors.initials: P
authors.lastname: Tantbirojn
authors.affiliation: Center of Excellence in Molecular Genetic of Cancer and Human Disease, Department of Anatomy, Faculty of Medicine, Chulalongkorn University, King Chulalongkorn Memorial Hospital, Bangkok 10330, Thailand.
authors.forename: Prakasit
authors.initials: P
authors.lastname: Rattanatanyong
authors.affiliation: Center of Excellence in Molecular Genetic of Cancer and Human Disease, Department of Anatomy, Faculty of Medicine, Chulalongkorn University, King Chulalongkorn Memorial Hospital, Bangkok 10330, Thailand.
authors.forename: Apiwat
authors.initials: A
authors.lastname: Mutirangura
mesh_terms: D000328:Adult; D019175:DNA Methylation / Q000235:genetics*; D005260:Female; D005819:Genetic Markers / Q000235:genetics; D020022:Genetic Predisposition to Disease / Q000453:epidemiology* / Q000235:genetics*; D006801:Humans; D006828:Hydatidiform Mole / Q000453:epidemiology* / Q000235:genetics*; D015994:Incidence; D020084:Long Interspersed Nucleotide Elements / Q000235:genetics*; D011247:Pregnancy; D011379:Prognosis; D018570:Risk Assessment / Q000379:methods; D013785:Thailand / Q000453:epidemiology
chemical_list: D005819:Genetic Markers