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Significant variation of immunohistochemical marker expression in paired primary and metastatic clear cell renal cell carcinomas.
Pan Z, Grizzle W, Hameed O
(2013) Am J Clin Pathol 140: 410-8
MeSH Terms: Antigens, Neoplasm, Biomarkers, Tumor, Cadherins, Carbonic Anhydrase IX, Carbonic Anhydrases, Carcinoma, Renal Cell, Humans, Kidney Neoplasms, PAX2 Transcription Factor, PAX8 Transcription Factor, Paired Box Transcription Factors, Receptor for Advanced Glycation End Products
Show Abstract · Added March 7, 2014
OBJECTIVES - To compare the immunohistochemical expression of diagnostic markers in primary clear cell renal cell carcinomas (RCCs) and their matched metastases.
METHODS - Tissue microarrays were constructed from 15 pairs of primary and metastatic clear cell RCCs and then evaluated for the immunohistochemical expression of renal cell carcinoma antigen (RCCA), kidney-specific cadherin, carbonic anhydrase IX (CAIX), and paired box genes 2 (PAX2) and 8 (PAX8).
RESULTS - There was significantly higher overall marker expression in metastatic tumors compared to their matched primaries (P < .001). Individually, there was greater CAIX, PAX2, and PAX8 expression and lower RCCA expression in metastatic tumors. Most importantly, a significant proportion of originally RCCA-positive tumors lost such expression in metastases.
CONCLUSIONS - Metastatic RCCs have significantly higher expression of PAX2 and PAX8 compared to primary RCCs. RCCA is not very reliable in this diagnostic setting, both because of its lower overall sensitivity and loss of expression in metastatic RCCs.
0 Communities
1 Members
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12 MeSH Terms
Association of progressive structural changes in the bronchial epithelium with subepithelial fibrous remodeling: a potential role for hypoxia.
Polosukhin VV, Lawson WE, Milstone AP, Egunova SM, Kulipanov AG, Tchuvakin SG, Massion PP, Blackwell TS
(2007) Virchows Arch 451: 793-803
MeSH Terms: Adult, Aged, Antigens, Neoplasm, Basement Membrane, Biopsy, Bronchi, Carbonic Anhydrase IX, Carbonic Anhydrases, Cell Hypoxia, Disease Progression, Female, Humans, Hypoxia-Inducible Factor 1, alpha Subunit, Male, Middle Aged, Precancerous Conditions, Pulmonary Disease, Chronic Obstructive, Respiratory Mucosa, Signal Transduction
Show Abstract · Added March 5, 2014
In airway remodeling that occurs in association with chronic obstructive pulmonary disease (COPD), the relationship between the subepithelium and structural changes of the bronchial epithelium is not well defined. To investigate whether the subepithelium and epithelium undergo remodeling as an integrated unit, we performed morphological examination of 55 bronchial biopsy specimens obtained from explanted or resected lungs from tobacco smokers with COPD. Our results indicate that reticular basement membrane (RBM) thickness is increased and the subepithelial microvascular bed is reduced in association with progression from the normal epithelium to squamous metaplasia. Subsequent bronchial epithelial transformation to dysplasia is characterized by differential subepithelial remodeling with normalization of RBM thickness and subepithelial blood vessel density. Because fibrous remodeling of the subepithelium could limit delivery of nutrients and oxygen to the epithelium, we assessed expression of hypoxia-inducible factor-1alpha (HIF-1alpha) and carbonic anhydrase IX (CA IX) as markers of cellular hypoxia. The number of HIF-1alpha-positive epithelial cells increased with progression of epithelial structural changes, RBM thickness, and reduction in blood vessels in the subepithelium. These findings suggest that the HIF-1alpha pathway is activated in response to subepithelial remodeling and contributes to progressive premalignant epithelial lesions in the airways of tobacco smokers with chronic airway inflammation.
1 Communities
3 Members
0 Resources
19 MeSH Terms