Genetic profile of cumulative mutational damage associated with early pulmonary adenocarcinoma: bronchioloalveolar carcinoma vs. stage I invasive adenocarcinoma.
To detect the possible genetic alterations characteristic of bronchioloalveolar carcinoma (BAC) and to study molecular genetic factors responsible for determining the biologic aggressiveness of pulmonary adenocarcinoma, comparative analysis of loss of heterozygosity (LOH) on 9 chromosomal regions was performed in 14 BACs and in 20 stage I adenocarcinomas (AD). The most frequently affected chromosome regions in BAC were 8q and 17p. In stage I AD, more than 60% of the cases showed LOH of 1p, 3p, 5q, 7q, 17p, and 18q loci, and LOH of 1p, 3p, 7q, and 18q was observed with greater frequency than in BAC (P < 0.05). Fractional allele loss (FAL) was significantly greater in stage I AD than in BAC (P < 0.001). In cases with microdissection of multiple sites, intratumoral heterogeneity of LOH status was observed in 73% of BAC and 94% of stage I AD, and homogeneous distribution of LOH of 9p was unique to BAC. The high FAL value was associated with a poor prognosis of BAC, but this trend did not reach statistical significance (P = 0.098). In stage I AD, no correlation was found between LOH of particular chromosomal region or FAL and clinical outcome. LOH of 1p, 3p, 7q, and 18q was associated with invasive properties of pulmonary AD and may be useful in identifying invasive adenocarcinoma when conventional histomorphological tools are not helpful.
Sasatomi
Eizaburo
E
Departments of Pathology, University of Pittsburgh Medical Center, 200 Lothrop Street, Pittsburgh, PA 15213, USA. sasatomie@msx.upmc.edu
Johnson
Lawrence R
LR
Aldeeb
Dalal N
DN
Lomago
Deren M
DM
Thompson
James W
JW
Swalsky
Patricia A
PA
Luketich
James D
JD
Fernando
Hiran C
HC
Finkelstein
Sydney D
SD
Yousem
Samuel A
SA
D002282:Adenocarcinoma, Bronchiolo-Alveolar / Q000235:genetics*; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D005838:Genotype; D006801:Humans; D019656:Loss of Heterozygosity; D008175:Lung Neoplasms / Q000235:genetics* / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009361:Neoplasm Invasiveness; D009367:Neoplasm Staging; D011379:Prognosis