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Correspondence
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Volume 344:935-936 March 22, 2001 Number 12
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Screening for Lung Cancer

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To the Editor: The review by Patz et al. (Nov. 30 issue)1 on screening for lung cancer omits mention of a major historical change over the past three decades: the most common cell type has shifted from squamous-cell to adenocarcinoma — a shift that appears to result from the physicochemical changes in late-20th-century cigarette smoke (e.g., increased levels of tobacco-specific nitrosamines).2 For example, 21 of the 27 (78 percent) peripheral stage I carcinomas detected by computed tomography (CT) among the 1000 smokers in the recent Early Lung Cancer Action Project screening study were adenocarcinoma, 3 (11 percent) were adenosquamous, and . . . [Full Text of this Article]

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