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The Korean Journal of Pathology 1994;28(5): 469-477.
PCNA Labelling index and AgNORs of Transitional Cell Carcinoma of the Urinary Bladder.
Byung Gon Park, Sang Yong Lee, Mee Sook Roh, Seo Hee Rha, Sook Hee Hong
Department of Pathology, Dong-A University School of Medicine, Pusan, Korea.
Proliferating cell nuclear antigen (PCNA, PC10), an auxillary protein of DNA polymerase, plays a main role in the early stage of DNA Synthesis and is synthesized from Gl phase to s phase of the cell cycle. Nucleolar organizer region (NORs) are DNA loops encoding RNA proteins(AgNORs). To evaluate correlation with PCNA labelling index (LI)and AgNORs according to histological grades and clinical stages of transitional cell carcinoma of the urinary bladder, the authors analysed 54 transitional cell carcinoma using immunohistochemical stain for PCNA and silver stain for AgNORs in paraffin sections. The comparison of PCNA (PC10) LI and clinical stage showed a significant correlation (p<0.05), where as PCNA (PC10) LI according to histologic grade showed no significant correlation. High grade tumors showed increase PCNA LI. Superficial tumors (Ta-Tl) showed significantly lower PCNA LI than muscle invasive tumors (T2-T4)(p<0.05). There was no significant correlation between AgNORs and clinical stage, bur higher stage and higher grade tumors showed increased noubers of AgNORs. These results suggest that PCNA LI has a significant correlation with clinical stages of transitional cell carcinoma of the urinary bladder.
Key Words: PCNA; Transitional cell carcinoma; AgNORs