HNRNPD and cervical cancer: Overexpression of circPCNX specifically blocks the association of AUF1 with p21 (CDKN1A) mRNA, thereby enhancing the stability of p21 mRNA and increasing the level of p21, which acts as a major inhibitor of cell proliferation, inhibiting the proliferation of cervical cancer cells and impeding the malignant development of cervical cancer (Tsitsipatis et al., 2021) (Figure 3C).