The oncologist
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Members of the International Committee of Medical Journal Editors require, as a condition of consideration for publication, that all clinical trials be registered in a public trials registry. We evaluated the proportion of registered trials that are published in the peer-reviewed literature. ⋯ Less than one in five studies in cancer that are registered with clinicaltrials.gov have been published in peer-reviewed journals. Research sponsors, researchers, and journal editors should redouble their efforts to encourage publication of registered clinical trials in oncology.