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Proliferating cell nuclear antigen in normal urothelium and urothelial lesions of the urinary bladder: a quantitative assessment using a true color image analysis system

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Virchows Archiv B

Summary

To evaluate proliferating cell nuclear antigen (PCNA) staining for assessing proliferative activity in routine pathology specimens of urinary bladder, the bladder carcinoma cell line J82 and a total of 122 specimens of normal bladder and urothelial lesions were stained with the antibody clone PC10 against proliferating cell nuclear antigen. In in vitro plateau cultures the proportion of PCNA-positive cells exceeded that of Ki-67-positive cells, and only very few cells were negative. In formalin-fixed tissues, the PCNA staining pattern, which should be confined to replicon units in the nucleus, was optimized by 1 h postfixation in an organic solvent (methacarn). Sections showed positive nuclear staining confined to basal and some suprabasal cells in normal urothelium and grade 1 dysplasias, but more generalized nuclear staining in all other neoplastic lesions. In addition, stromal cells adjacent to invasive tumors showed nuclear positivity in some instances. Using quantitative true color image analysis of sections counterstained with hemalum, the degree of brown staining of the PCNA reaction product is contrasted with the blue staining of the nuclear area. With this method low contrast specific staining not appreciated optically can be reliably detected. Image analysis data confirmed observations made on noncounterstained sections and showed significant differences between grade 1 and 2 dysplasias as well as between grade 1 dysplasia and all grades of papillary tumor. Furthermore, a significant difference in PCNA staining indices was found between grade 1 and 3 bladder carcinomas. The results indicate that PCNA staining using the PC10 antibody is not confined to the proliferative fraction of neoplastic urothelium. In contrast with data from normal tissue and malignant hematological neoplasms, the amount of PCNA is regulated differently in urothelial neoplasms, emphasizing the biological differences between the following two sets: mild dysplasia and moderate dysplasia; mild dysplasia and papillary carcinomas. The use of image analysis to standardize the detection process after controlled staining conditions is advisable in order to provide reliable data.

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Authors and Affiliations

  1. Institute of Pathology, University of Regensburg, Franz-Josef-Strauss Allee 11, W-8400, Regensburg, Germany

    Ruth Knuechel, Markus Burgau, Josef Rueschoff & Ferdinand Hofstaedter

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  1. Ruth Knuechel
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  2. Markus Burgau
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  3. Josef Rueschoff
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  4. Ferdinand Hofstaedter
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Supported by the DFG project: Knuechel/Urothelcarcinom 263

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Knuechel, R., Burgau, M., Rueschoff, J. et al. Proliferating cell nuclear antigen in normal urothelium and urothelial lesions of the urinary bladder: a quantitative assessment using a true color image analysis system. Virchows Archiv B Cell Pathol 64, 137–144 (1993). https://doi.org/10.1007/BF02915106

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  • DOI: https://doi.org/10.1007/BF02915106

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