title: Clinical, histological, and immunohistochemical features predicting 1p/19q loss of heterozygosity in oligodendroglial tumors.
abstract: To identify a better diagnostic criteria for oligodendroglial tumors, we investigated the clinical, histological, and immunohistochemical features that would be able to predict a 1p/19q loss of heterozygosity (LOH) in these tumors. We performed a PCR-based LOH test with the 1p and 19q microsatellite markers by microdissecting tumor in 56 samples (44 oligodendrogliomas and 12 mixed oligoastrocytomas) of paraffin-embedded tissue. Patients with oligodendroglial tumors with 1p/19q LOH had a statistically significant better prognosis for overall survival. Comparative analysis of several features indicated that the 1p/19q LOH tumors were associated with two histological features, "tumor cellularity" and "perinuclear halo," and low O(6)-methylguanine-DNA-methyltransferase (MGMT) expression and high cytoplasmic glutathione S-transferase pi (GST-pi) expression. In addition, the incidence of 1p/19q LOH was infrequent in the youngest age category (less than 20 years old) studied. Using the new features, we could predict the 1p/19q status of oligodendroglial tumors with greater than 90% accuracy. Therefore, applying these features in clinical practice, would be helpful in clarifying oligodendroglial tumor diagnosis.
authors.affiliation: Department of Pathology, College of Medicine, Yonsei University, Seoul, Korea.
authors.forename: Se Hoon
authors.initials: SH
authors.lastname: Kim
authors.forename: Hoguen
authors.initials: H
authors.lastname: Kim
authors.forename: Tai Seung
authors.initials: TS
authors.lastname: Kim
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D014408:Biomarkers, Tumor / Q000032:analysis*; D001932:Brain Neoplasms / Q000175:diagnosis* / Q000235:genetics* / Q000378:metabolism; D002648:Child; D002878:Chromosomes, Human, Pair 1; D002888:Chromosomes, Human, Pair 19; D005260:Female; D005910:Glioma / Q000175:diagnosis* / Q000235:genetics* / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D019656:Loss of Heterozygosity; D008297:Male; D008875:Middle Aged; D016133:Polymerase Chain Reaction; D012680:Sensitivity and Specificity; D016019:Survival Analysis
chemical_list: D014408:Biomarkers, Tumor