Integrative assessment of multiple pesticides as risk factors for non-Hodgkin's lymphoma among men.
BACKGROUND
An increased rate of non-Hodgkin's lymphoma (NHL) has been repeatedly observed among farmers, but identification of specific exposures that explain this observation has proven difficult.


METHODS
During the 1980s, the National Cancer Institute conducted three case-control studies of NHL in the midwestern United States. These pooled data were used to examine pesticide exposures in farming as risk factors for NHL in men. The large sample size (n = 3417) allowed analysis of 47 pesticides simultaneously, controlling for potential confounding by other pesticides in the model, and adjusting the estimates based on a prespecified variance to make them more stable.


RESULTS
Reported use of several individual pesticides was associated with increased NHL incidence, including organophosphate insecticides coumaphos, diazinon, and fonofos, insecticides chlordane, dieldrin, and copper acetoarsenite, and herbicides atrazine, glyphosate, and sodium chlorate. A subanalysis of these "potentially carcinogenic" pesticides suggested a positive trend of risk with exposure to increasing numbers.


CONCLUSIONS
Consideration of multiple exposures is important in accurately estimating specific effects and in evaluating realistic exposure scenarios.
De Roos
A J
AJ
Division of Cancer Epidemiology and Genetics, National Cancer Institute/NIH, Bethesda, MD, USA. aderoos@fhcrc.org
Zahm
S H
SH
Cantor
K P
KP
Weisenburger
D D
DD
Holmes
F F
FF
Burmeister
L F
LF
Blair
A
A
D000328:Adult; D000382:Agricultural Workers' Diseases / Q000139:chemically induced* / Q000401:mortality; D016022:Case-Control Studies; D006801:Humans; D007306:Insecticides / Q000009:adverse effects; D008228:Lymphoma, Non-Hodgkin / Q000139:chemically induced* / Q000401:mortality; D008297:Male; D015146:Midwestern United States / Q000453:epidemiology; D016273:Occupational Exposure / Q000009:adverse effects*; D009943:Organophosphorus Compounds; D010575:Pesticides / Q000009:adverse effects*; D012307:Risk Factors
D007306:Insecticides; D009943:Organophosphorus Compounds; D010575:Pesticides