The objective of this study was to determine whether consent forms in oncology clinical trials of commercially available treatments inform subjects that they may be able to obtain the treatments being investigated without participating in research. We acquired consent forms from a random sample of U.S. oncology clinical trials in the ClinicalTrials.gov database. We then examined a subgroup of the sample consisting of studies in which the treatments under investigations were commercially available. Less than 20% of the consent forms in (...) that group disclosed to subjects that they may be able to obtain the treatment being investigated without participating in the study . Our results suggest that potential research subjects are frequently not informed about important alternatives to research participation in studies involving commercially available treatments, which is a violation of both ethical and regulatory standards. (shrink)