Cytokeratin‐20 immunocytochemistry in voided urine cytology and its comparison with nuclear matrix protein‐22 and urine cytology in the detection of urothelial carcinoma

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Abstract

This study was done on 59 subjects (42 urinary bladder carcinoma patients and 17 non-neoplastic controls). Urine cytology and bladder chek NMP22 test was done on all cases. CK20 immunostaining was performed on archived papanicolaou stained urine cytology smears in 34 cases (27 bladder carcinoma and 7 negative controls). Results of all three tests (cytology, NMP22, and CK20 immunostaining) were compared with histopathology to evaluate the accuracy of individual test. The combination of cytology and NMP22 was compared with combination of cytology and CK20 immunostaining for detection of bladder carcinoma. NMP22 had sensitivity of 92.9% and specificity of 70.6%, as compared with voided urine cytology (sensitivity of 76.2% and specificity of 76.5%) and CK20 immunostaining (sensitivity of 70.4% and specificity of 71.4%). Combination of cytology and NMP22 gave better results (sensitivity of 88.1% and specificity of 88.2%) than combination of cytology and CK20 immunostaining or any other test in isolation.

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