PCNA and neoplasm: This came in agreement with Gui et al. (2016) who declared that forced expression of miR-199a-5p by a lentiviral vector expressing miR-199a-5p inhibited HepG2 cell proliferation as elucidated by decreased expression of Proliferating cell nuclear antigen (PCNA), a marker of tumor cell proliferation (Gui et al., 2016).