The purposes of eligibility criteria for cancer clinical trials are to select the intended patient population and reduce potential risks to trial participants. However, eligibility criteria are sometimes more restrictive than necessary, and expanding eligibility criteria to be more inclusive is one trial design consideration that may improve the diversity of clinical trial populations. This guidance is one in a series of guidances that provide recommendations regarding eligibility criteria for clinical trials of investigational drugs regulated by CDER and CBER for the treatment of cancer. Specifically, this guidance includes recommendations regarding expanding eligibility criteria to include patients with a wider range of performance status. This guidance is intended to assist interested parties, including sponsors and/or institutional review boards, who are responsible for the development and oversight of clinical trials.