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Correspondence
July 21, 2008

Topical Tretinoin, Lung Cancer, and Lung-Related Mortality

Arch Dermatol. 2008;144(7):945-946. doi:10.1001/archderm.144.7.945

Amid continuing controversies over drug safety,1,2 results of a trial of topical tretinoin—a commonly used medication for acne3 and skin wrinkles, hyperpigmentation, and roughness4—raise serious concerns for the public health. The Veterans Affairs Topical Tretinoin Chemoprevention (VATTC) trial5,6 was a vehicle-controlled randomized controlled trial (RCT) that studied whether topical tretinoin, 0.1%, cream applied to the face and ears could prevent nonmelanoma skin cancer. As reported in an abstract published in 2005,6 the study observed 1131 subjects for at least 2 years. After 6 years, and about 6 months prior to the study's scheduled conclusion, a safety monitoring committee stopped the study because of excess mortality among subjects who applied tretinoin (n = 82 deaths [14%]) compared with those who applied vehicle (n = 53 [9%]) (P = .01). Differences in mortality from pulmonary disease (12 vs 4) and non–small cell lung cancer (NSCLC) (11 vs 4) were reported.5

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