N-acetyltransferase 1 in colon and rectal cancer cases from an industrialized area.
Colon and rectal cancers are both associated with genetic as well as nutritional, occupational, and environmental factors. Aromatic amines and heterocyclic amines are established colorectal carcinogens. The polymorphic enzyme N-acetyltransferase 1 (NAT1) contributes to heterocyclic amine metabolism in the human colon. Thereby, NAT1 may influence the risk for development of colorectal cancer. The distribution of NAT1 genotypes was determined in 107 colon cancer cases, 77 rectal cancer cases, and 185 controls (suffering from nonmalignant diseases) by standard methods. In addition, possible occupational and nonoccupational risk factors were determined by a personal interview. Cancer cases and controls were derived from an area of former coal, iron, and steel industries, which is known for elevated colon cancer mortality. The proportions of NAT1*4/*4 genotype were 72% in controls, 75% in rectal cancer cases, and 72% in colon cancer cases. The proportions of the NAT1*4/*10 genotype were 17.8% in controls, 12.9% in rectal cancer cases, and 14% in colon cancer cases. Combinations of the determined NAT1 alleles *3/*3, *3/*10, *4/*3, *4/*11, *10/*10 and *11/*11 contributed to 10.2% of the genotypes in controls, 12.1% in rectal cancer cases, and 14% in colon cancer cases. In contrast to another study on healthy German volunteers, the NAT1*4/*4 genotype (wild type) is overrepresented. This might be due to the variation in the proportion of NAT1 alleles in the general population. The present study does not support a relevant impact of the NAT1 genotype on colorectal cancer risk development in the study area.
Institute for Occupational Physiology at the University of Dortmund (IfADo), Leibniz Research Centre for Working Environment and Human Factors, Dortmund, Germany.
Hermann C
HC
Roemer
Wobbeke
W
Weistenhofer
Dietrich
D
Lohlein
Frank
F
Geller
Brunhilde
B
Blomeke
Klaus
K
Golka
D000588:Amines / Q000009:adverse effects / Q000737:chemistry; D001191:Arylamine N-Acetyltransferase / Q000235:genetics*; D016022:Case-Control Studies; D003110:Colonic Neoplasms / Q000201:enzymology* / Q000453:epidemiology / Q000235:genetics; D004785:Environmental Pollutants / Q000009:adverse effects; D020022:Genetic Predisposition to Disease; D005838:Genotype; D005858:Germany / Q000453:epidemiology; D006801:Humans; D007220:Industrial Waste; D007527:Isoenzymes / Q000235:genetics*; D012004:Rectal Neoplasms / Q000201:enzymology* / Q000453:epidemiology / Q000235:genetics
D000588:Amines; D004785:Environmental Pollutants; D007220:Industrial Waste; D007527:Isoenzymes; D001191:Arylamine N-Acetyltransferase; C089384:N-acetyltransferase 1