Differences in K-ras and p53 gene mutations among pancreatic adenocarcinomas associated with regional environmental pollution.
BACKGROUND
Variations in genetic mutations in pancreatic carcinoma between different geographical regions have not been studied extensively, especially in developing countries where pancreatic cancer is relatively rare.


METHODS
We studied the molecular pathology of 54 pancreatic adenocarcinomas from Egyptian patients residing in a heavily polluted region of the eastern Nile River delta and compared the findings with 45 tumors from patients residing in low-pollution regions.


RESULTS
Rates of K-ras mutation in codon 12 and of p53 mutation in exons 5-8 were higher in tumors of patients from the high-pollution region as compared with the low-pollution regions (61.5 versus 34.2%, respectively, for K-ras, P = 0.01; 25.9 versus 11.6%, respectively, for p53, P = 0.08). There were also distinct differences in the specific types of K-ras and p53 mutations between the two regions. The ratio of G-to-T k-ras transversion mutation (codon 12) relative to wild-type was significantly higher in tumors from the high-pollution region (0.90) than tumors from the non-pollution site (0.28) (P = 0.03). Relative to tumors with wild-type, the ratio of p53 mutations in exons 5, 7 or 8 to wild-type in tumors from the high-pollution region was significantly higher than the ratio from the non-pollution site (0.28 versus 0.03, P = 0.01). Logistic regression showed that G-to-T transversion mutation in K-ras was predicted by the region of residence of the patients.


CONCLUSIONS
Our study reveals that there are differences in the frequencies and types of K-ras and p53 mutations found in pancreatic adenocarcinomas of patients in high-pollution and low-pollution regions in Egypt and suggests that environmental factors may explain these differences. We speculate that gene-environment interactions in pancreatic carcinogenesis also occur in other populations.
Soliman
Amr S
AS
Department of Epidemiology, University of Michigan School of Public Health, 109 Observatory Street, Ann Arbor, MI 48109, USA. asoliman@umich.edu
Lo
An-Chi
AC
Banerjee
Mousumi
M
El-Ghawalby
Nabih
N
Khaled
Hussein M
HM
Bayoumi
Sherif
S
Seifeldin
Ibrahim A
IA
Abdel-Aziz
Atef
A
Abbruzzese
James L
JL
Greenson
Joel K
JK
Hamilton
Stanley R
SR
D000230:Adenocarcinoma / Q000139:chemically induced / Q000235:genetics*; D004787:Environmental Pollution / Q000009:adverse effects; D005260:Female; D016158:Genes, p53 / Q000235:genetics*; D011905:Genes, ras / Q000235:genetics*; D020022:Genetic Predisposition to Disease; D006801:Humans; D008297:Male; D008875:Middle Aged; D009154:Mutation; D010190:Pancreatic Neoplasms / Q000139:chemically induced / Q000235:genetics*