PCNA and neoplasm: Hematoxylin and eosin staining revealed that the number of tumor cells was lower in the si-SNHG12 group than in the si-NC group, and immunohistochemistry analysis revealed that the protein expression of proliferating cell nuclear antigen (PCNA) was significantly lower in the si-SNHG12 group than in the si-NC group (Figure 7D).