PAX-8 expression in renal tumours and distant sites: a useful marker of primary and metastatic renal cell carcinoma?

Abstract:

AIMS:Immunohistochemical stains have greatly improved the diagnostic accuracy of renal cell carcinoma (RCC) for primary and distant tumours. We evaluate a marker that has recently been incorporated in clinical practice, PAX-8, in primary and metastatic RCCs. METHODS:Two distinct tissue microarrays were used, one consisting of over 334 renal tumours, 294 with adjacent normal kidney and the other with 40 matched nephrectomy and metastatic sites of RCC. PAX-8 expression was assessed by a method of quantitative immunofluorescence. RESULTS:PAX-8 was positive in 96% (146/152) of normal renal tissue and 83% (227/272) of renal tumours. PAX-8 staining was positive in clear cell, papillary and chromophobe tumours in 80% (165/207), 95% (39/41) and 100% (6/6) of samples, respectively. Overall, intensity of PAX-8 expression was significantly higher in RCC metastatic sites than in the primary site (p=0.0047), however, in matched sites there was no statistically significant difference in the proportion of positive versus negative specimens (p=0.274). CONCLUSIONS:As the role of molecular markers expands in the diagnostic algorithm, this study confirms that PAX-8 expression is a useful diagnostic marker for RCC. PAX-8 expression was found in the primary tumour and distant sites. Compared with normal tissue and other histological types, clear cell RCC has lower PAX-8 expression and is less frequently positive, therefore, the lack of expression does not exclude a tumour of renal origin.

journal_name

J Clin Pathol

authors

Barr ML,Jilaveanu LB,Camp RL,Adeniran AJ,Kluger HM,Shuch B

doi

10.1136/jclinpath-2014-202259

subject

Has Abstract

pub_date

2015-01-01 00:00:00

pages

12-7

issue

1

eissn

0021-9746

issn

1472-4146

pii

jclinpath-2014-202259

journal_volume

68

pub_type

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