© 1991 by Oxford University Press
Journal of the National Cancer Institute, Vol. 83, No. 17, 1226-1231,
September 4, 1991
© 1991 Oxford University Press
Case-Control Study of Canine Malignant Lymphoma: Positive Association With Dog Owner's Use of 2, 4-Dichlorophenoxyacetic Acid Herbicides
1Epidemiology and Biostatistics Program, Division of Cancer Etiology, National Cancer Institute Bethesda, Md.
2College of Veternary Medicine, University of Minnesota St. Paul
3Veterinary Teaching Hospital, College of Veterinary Medicine, Colorado State University Ft. Collins
4Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University West Lafayette, Ind.
*Correspondence to: H. M. Hayes, D.V.M., Environmental Epidemiology Branch, National Institutes of Health, Executive Plaza North, Rm. 443, Bethesda, MD 20892.
A hospital-based case-control study of companion dogs examined the risk of developing canine malignant lymphoma associated with the use of chemicals in and about the home. Information from a self-administered owner questionnaire and/or a telephone interview of about 491 cases, 466 nontumor controls, and 479 tumor controls indicated that owners in households with dogs that developed malignant lymphoma applied 2, 4-dichlorophenoxyacetic acid (2, 4-D) herbicides to their lawn and/or employed commercial lawn care companies to treat their yard significantly more frequently than control owners (odds ratio = 1.3). In addition, the risk of canine malignant lymphoma rose to a twofold excess with four or more yearly owner applications of 2, 4-D. The findings in this study are consistent with occupational studies in humans, which have reported modest associations between agricultural exposure to 2, 4-D and increased risk of non-Hodgkin's lymphoma, the histology and epidemiology of which are similar to those of canine malignant lymphoma. The present study suggests that human health implications of 2, 4-D exposure in the home environment should receive further investigation. [J Natl Cancer Inst 83:12261231, 1991]
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