In addition, levels of DDT or metabolites can be reported in either a lipid base or a wet base, thus affect- ing comparability across the studies. In the only study that considered the presence of estrogenic receptors in patients with breast cancer (5), a highly significant difference was found between the levels of DDE in adipose tissue and serum in women with breast cancer (cases) and controls with benign breast disease (x DDE adipose tis- sue: 2732 ? 2749.9 pg/kg versus 765 ? 52.9 pg/kg, serum: 8.5 pg/l versus 3.5 pg/l).
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