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Departments of Pathology [A. Y., K. O., T. K., H. S., Y. K.], Internal Medicine [K. O.], and Surgery [M. H.], Cancer Institute, 1-37-1 Kami-Ikebukuro, Toshima-ku, Tokyo, 170 Japan
In order to scrutinize the possible significance of (nonatypical) mucous cell hyperplasia of the pancreas to neoplasia, we analyzed these lesions in terms of c-Ki-ras activation, which is known to be very frequent in pancreatic carcinomas. A total of 16 such mucous cell hyperplasias were collected from 10 pancreases resected for chronic pancreatitis. Tiny tissue fragments were taken from hematoxylin-stained sections by microdissection, and DNA analysis was carried out by the polymerase chain reaction amplification and oligonucleotide hybridization methods. Activating mutations of c-Ki-ras oncogene at codon 12 were detected in 10 of the 16 lesions (62.5%), a high rate as seen in carcinomas. The results indicated a clonal origin of cells comprising the mucous cell hyperplasia suggesting a neoplastic and/or precancerous nature.
1 This work was supported in part by the Ministry of Education, Science and Culture and the Ministry of Health and Welfare.
2 To whom requests for reprints should be addressed.
Received 12/11/92. Accepted 1/20/93.
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