title: When "Effective" Prevention Agents Fail to Elicit Anticipated Effects: Challenges in Trial Design.
authors.affiliation: Departments of Dermatology and Translational Molecular Pathology, Divisions of Internal Medicine and Pathology, MD Anderson Cancer Center, Houston, Texas. kytsai@mdanderson.org.
authors.forename: Kenneth Y
authors.initials: KY
authors.lastname: Tsai
authors.affiliation: Department of Clinical Cancer Prevention, Division of Cancer Prevention and Population Sciences, MD Anderson Cancer Center, Houston, Texas.
authors.forename: Ernest T
authors.initials: ET
authors.lastname: Hawk
mesh_terms: D006801:Humans; D012107:Research Design