K. Takamochi et al., Loss of heterozygosity on chromosomes 9q and 16p in atypical adenomatous hyperplasia concomitant with adenocarcinoma of the lung, AM J PATH, 159(5), 2001, pp. 1941-1948
Citations number
32
Categorie Soggetti
Research/Laboratory Medicine & Medical Tecnology","Medical Research Diagnosis & Treatment
Atypical adenomatous; hyperplasia (AAH) has recently been implicated as a p
recursor to lung adenocarcinoma. We previously reported loss of heterozygos
ity (LOH) in tuberous sclerosis (TSC) gene-associated regions to frequently
be observed in lung adenocarcinoma with multiple AAHs. in this study, we a
nalyzed LOH in four microsatellite loci on 9q, including the TSC1 gene-asso
ciated region, and four loci on 16p, including the TSC2 gene-associated reg
ion, in both 18 AAHs and 17 concomitant lung adenocarcinomas from I I patie
nts. Seven of 18 (39%) AAHs and 9 of 17 (53%) adenocarcinomas displayed LOH
on 9q. Five (28%) AAHs and seven (41%) adenocarcinomas harbored LOH at loc
i adjacent to the TSC1 gene. Four of 18 (22%) AAHs and 6 of 17 (35%) adenoc
arcinomas displayed LOH on 16p. One (6%) AAH and five (29%) adenocarcinomas
harbored LOH at loci adjacent to the TSC2 gene. These findings may indicat
e a causal relationship of LOH on 9q and 16p mi a fraction of AAH lesions a
nd adenocarcinomas of the lung. Especially, the frequencies of LOH on 9q an
d at the TSC1 gene-associated region were high. The TSC1 gene or another ne
ighboring tumor suppressor gene on 9q might be involved in an early stage o
f the pathogenesis of lung adenocarcinoma.