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Editor's Correspondence |

Analysis of Passive Smoking and Breast Cancer of Limited Value

Kenneth C. Johnson, PhD; A. B. Miller, MD, FRCPC; S. Katharine Hammond, PhD; Neil E. Collishaw, MA
Arch Intern Med. 2011;171(16):1508-1510. doi:10.1001/archinternmed.2011.383.
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The findings from the Nurses Health Study1 of increased breast cancer risk associated with longer duration of smoking, higher pack-years, younger age at smoking initiation, and smoking before first birth are consistent with those from 9 cohort studies recently summarized by the Canadian Expert Panel on Tobacco Smoke and Breast Cancer Risk.2

The negative findings on passive smoking, however, are at odds with the consistent findings of increased premenopausal risk in 7 case-control studies with detailed lifetime assessment of passive smoking at home and at work2,3 and postmenopausal risk in the one cohort study with lifetime passive assessment.4

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Correspondence

September 12, 2011
Fei Xue, MD, ScD; Walter C. Willett, MD, DrPH; Bernard A. Rosner, PhD; Susan E. Hankinson, ScD; Karin B. Michels, ScD, PhD
Arch Intern Med. 2011;171(16):1508-1510. doi:10.1001/archinternmed.2011.384.
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