title: Frequent allelic loss of 21q11.1 approximately q21.1 region in advanced stage oral squamous cell carcinoma.
abstract: A fine mapping of loss of heterozygosity (LOH) was performed in oral squamous cell carcinoma (OSCC), using 12 markers on 21q11.1 approximately q21.1. We studied 43 resected primary invasive tumors and their paired normal tissues, concurrent dysplasia or carcinoma in situ in separate areas from 8 of the specimens, and 6 local recurrent carcinomas. LOH status was compared between lesions of different phases of progression within the same patient. A high frequency of LOH was observed for D21S1410, D21S120, and D21S1433 (60% each) in the primary lesions, constituting two interstitial deleted regions encompassing eight known genes. Cases showing LOH of D21S120 were significantly associated with advanced clinical stages (III and IV; P=0.02). Consistent allelic loss was observed in 64.2% of the informative cases between the precursor lesions and their corresponding invasive tumors, and in 59.5% of those between the primary lesions and their recurrent counterparts. Fewer than half of the different lesions within a given patient showed discordant allelic loss for tested markers. Our results suggest that 21q11.1 approximately q21.1 harbors tumor suppressor genes in OSCC. Genetic divergence may develop during tumor clone evolution.
authors.affiliation: Oral Biosciences, Dental Faculty, University of Hong Kong, 34 Hospital Road, Hong Kong.
authors.forename: Lan
authors.initials: L
authors.lastname: Chen
authors.forename: Maria Pik
authors.initials: MP
authors.lastname: Wong
authors.forename: Lim Kwong
authors.initials: LK
authors.lastname: Cheung
authors.forename: Lakshman P
authors.initials: LP
authors.lastname: Samaranayake
authors.forename: Larry
authors.initials: L
authors.lastname: Baum
authors.forename: Nabil
authors.initials: N
authors.lastname: Samman
mesh_terms: D002278:Carcinoma in Situ / Q000235:genetics; D002294:Carcinoma, Squamous Cell / Q000235:genetics*; D002891:Chromosomes, Human, Pair 21 / Q000235:genetics*; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D016147:Genes, Tumor Suppressor; D006801:Humans; D019656:Loss of Heterozygosity; D008297:Male; D018895:Microsatellite Repeats; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000235:genetics*; D009361:Neoplasm Invasiveness / Q000235:genetics; D009364:Neoplasm Recurrence, Local / Q000235:genetics; D009367:Neoplasm Staging; D016133:Polymerase Chain Reaction
chemical_list: D004273:DNA, Neoplasm