Nonrandomized clinical trials

Definition of nonrandomized clinical trial
National Cancer Institute

nonrandomized clinical trial

(non-RAN-duh-mized KLIH-nih-kul TRY-ul)
A clinical trial in which the participants are not assigned by chance to different treatment groups. Participants may choose which group they want to be in, or they may be assigned to the groups by the researchers.

Source: NCI Dictionary of Cancer Terms