Among the 12 proteins verified by IP and RNA pull‐down, c‐Myc, which has been reported to be closely correlated with mutp53 in cancers,[26] was selected as the downstream cotarget of both HDAC1 and circCFL1, and the peptide sequence of c‐Myc identified by IP is shown in Figure 5C. Here, HDAC1 is linked to cancer.