In the article “American Cancer Society Perspectives on Environmental Factors and Cancer” (CA Cancer J Clin. 2009;59:343–351), the name of 1 author, Kenneth M. Portier, PhD (Director of Statistics, Statistics and Evaluation Center, Research Department, American Cancer Society, Atlanta, GA), was inadvertently omitted. The author list should correctly read: Elizabeth T. H. Fontham, DrPH; Michael J. Thun, MD; Elizabeth Ward, PhD; Kenneth M. Portier, PhD; Alan J. Balch, PhD; John Oliver L. Delancey, MPH; and Jonathan M. Samet, MD; on behalf of the ACS Cancer and the Environment Subcommittee. The authors regret the error.