DICER1 and Familial prostate cancer: More convincingly, the interaction of endogenous USP7 and DICER was confirmed in human breast cancer cell lines MDA‐MB‐231 (Fig. 1D) and HCC1937 (Fig. S1A), prostate cancer cell line DU145 (Fig. 1E), and liver cancer cell line HepG2 (Fig. S1B).