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Utility of HBME-1 immunostaining in serous effusions
V Ascoli1, C Carnovale-Scalzo, S Taccogna
1Dipartimento di Medicina Sperimentale e Patologia, Università La Sapienza, Roma, Italy.
Summary
The HBME-1 antibody shows promise in identifying mesothelioma by highlighting cell membranes. However, its reactivity in some adenocarcinomas necessitates careful interpretation alongside other diagnostic markers.
Area of Science:
- Immunohistochemistry
- Oncology
- Cytopathology
Background:
- Distinguishing malignant mesothelioma from metastatic adenocarcinoma in body effusions is diagnostically challenging.
- HBME-1 is a monoclonal antibody targeting mesothelial cells, potentially aiding in differential diagnosis.
Purpose of the Study:
- To evaluate the diagnostic utility of the HBME-1 antibody in differentiating mesothelioma from adenocarcinoma in body cavity effusions.
- To assess the specificity and sensitivity of HBME-1 staining patterns in various neoplastic and non-neoplastic effusions.
Main Methods:
- Immunohistochemical analysis of 227 body cavity effusions using the HBME-1 antibody.
- Assessment of staining patterns (cell membrane, cytoplasmic) and intensity in mesotheliomas, adenocarcinomas (ovarian and non-ovarian), and non-neoplastic mesothelial cells.
Main Results:
- HBME-1 demonstrated thick surface staining on all mesotheliomas.
- Significant HBME-1 reactivity was observed in 24% of metastatic carcinomatous effusions, notably 83% of ovarian carcinomas.
- Cytoplasmic staining was seen in 14% of non-ovarian adenocarcinomas.
Conclusions:
- HBME-1 is a valuable marker for mesothelioma, showing characteristic surface membrane staining.
- The antibody exhibits limited specificity due to reactivity in a subset of adenocarcinomas, particularly ovarian.
- HBME-1 should be used in conjunction with other markers and careful evaluation of staining patterns for accurate mesothelioma diagnosis.