“…Circular RNA (circRNA) is a special class of non‐coding RNA that is circular in shape and is formed by back splicing between the 5′ splice donor and the 3′ splice acceptor of the precursor messenger RNA. 6 Currently, many experiments have demonstrated that circRNAs play a crucial role in the development and progression of various cancers such as liver, 7 , 8 lung, 9 , 10 stomach, 11 , 12 bladder, 13 , 14 and cervical cancers, 15 , 16 etc. Similarly, in PCa, an increasing number of circRNAs have been discovered.…”