ITGB1 and neoplasm: reported that the tumor‐suppressive function of circPABPC1 was achieved by linking ITGB1 to the 26S proteasome for degradation.[43] We found that circ0006646 was located in both the nucleus and cytoplasm, and a series of specific peptides were identified as circ0006646 interactors by RNA pulldown, RIP, and MS assays.