Evaluation of adult papillary thyroid carcinomas by comparative genomic hybridization and microsatellite instability analysis.
To clarify the mechanism of tumorigenesis in papillary thyroid carcinoma (PTC) and ascertain whether genomic changes correlate with histologic features, we conducted a comprehensive molecular evaluation of PTC using comparative genomic hybridization (CGH) and microsatellite instability (MSI) analysis in a set of 17 histologically well-characterized PTC specimens. To our knowledge, this is the first study that evaluates chromosomal and nucleotide instability in the same PTC tumor specimens. Four of 15 samples (27%) had aberrations detected by CGH. All four had a partial or complete gain of chromosome 20, and 3 of 4 had a partial or complete loss of chromosome 13. No MSI was detected in any of the PTC samples (n=16), and all samples examined by immunohistochemistry (n=9) expressed the DNA repair enzymes hmlh1 and hmsh2. All PTC samples with abnormal CGH had vascular invasion or invasion of the thyroid capsule, and there was a significant correlation between the presence of chromosomal aberrations and capsular/vascular invasion (P=0.026). We conclude that although chromosomal and microsatellite instability are uncommon in PTC, tumors with chromosomal aberrations are more likely to be associated with invasion.
Bauer
Andrew J
AJ
Department of Pediatrics, Walter Reed Army Medical Center, USA, Washington, DC, USA.
Cavalli
Luciane R
LR
Rone
Janice D
JD
Francis
Gary L
GL
Burch
Henry B
HB
Tuttle
R Michael
RM
Ringel
Matthew D
MD
Stratakis
Constantine A
CA
Haddad
Bassem R
BR
D000231:Adenocarcinoma, Papillary / Q000235:genetics* / Q000473:pathology; D000328:Adult; D000368:Aged; D002471:Cell Transformation, Neoplastic / Q000235:genetics; D002869:Chromosome Aberrations; D002872:Chromosome Deletion; D002882:Chromosomes, Human, Pair 13 / Q000235:genetics; D002890:Chromosomes, Human, Pair 20 / Q000235:genetics; D005260:Female; D006801:Humans; D008297:Male; D018895:Microsatellite Repeats; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009693:Nucleic Acid Hybridization; D013964:Thyroid Neoplasms / Q000235:genetics* / Q000473:pathology