Abstract
In the course of earlier tests the authors had found that the cancer mortality among 231 adult persons living adjacent to an automobile road was much higher than among persons living in a traffic-free section of the same town. Fifty-nine of the above individuals residing adjacent to the automobile road had been treated with calcium EDTA to eliminate lead. Only one of these later died of cancer. Of the persons who were not treated with calcium EDTA, on the other hand, 30 died of cancer, or ten times more percentage-wise. The existence of small lead deposits as well as the health-impairing effect of lead were demonstrated by measurements of lead and delta-aminolaevulinic acid in urine. After treatment with calcium EDTA, the lead content, as well as the amount of delta-aminolaevulinic acid, became normal. The concentrations of lead were found to be greater in suspended dust particles and in sediment dust along the automobile artery than elsewhere in the town. These findings, together with many other reports in the medical literature lead to the suspicion that lead in automobile gasoline, combined with other carcinogenic substances in automotive exhaust gases, increases the incidence of cancer.
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