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2004 DEC 2 - (NewsRx.com & NewsRx.net) -- A study by University of North Carolina, Chapel Hill, epidemiologists found that exposure to environmental tobacco smoke wasn't associated with increased breast cancer incidence, except in women with hormone receptor-positive tumors and those with long-term exposure.
"To evaluate whether environmental tobacco smoke (ETS) influences breast cancer incidence, data from a population-based case-control study were analyzed. Respondents with available ETS information assessed by in-person questionnaires included 1,356 newly-diagnosed cases and 1,383 controls," wrote M.D. Gammon and colleagues.
"Relative to nonsmokers who reported no residential ETS exposure throughout the life course, the odds ratios (OR) for breast cancer were not substantially elevated in relation to ETS exposure, active smoking, or a joint measure of active and passive smoking (OR, 1.15, 95% CI, 0.90, 1.48)," the researchers reported.
"An increased OR, however, was noted among nonsmokers who lived with a smoking spouse for over 27 years (2.10, 95% CI, 1.47, 3.02), although no dose-response was evident. Also, among women with hormone-receptor-positive tumors only, the OR ...