ESRP1 and cancer: Moreover, circDOCK1(2–27) levels are strongly correlated with the level of ESRP1 in breast cancer cell lines and in cancers in general (Figure 2C and D), and circDOCK1(2–27) is more strongly correlated with ESRP1 than with any other transcript in cancers in general (Figure 2E and Supplementary Table S1).