Fully automated dual-color dual-hapten silver in situ hybridization staining for MYC amplification: a diagnostic tool for discriminating secondary angiosarcoma
Article first published online: 22 JAN 2014
© 2013 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd
Journal of Cutaneous Pathology
Volume 41, Issue 3, pages 286–292, March 2014
How to Cite
Fully automated dual-color dual-hapten silver in situ hybridization staining for MYC amplification: a diagnostic tool for discriminating secondary angiosarcoma., , , , , .
- Issue published online: 23 FEB 2014
- Article first published online: 22 JAN 2014
- Accepted manuscript online: 12 DEC 2013 12:11PM EST
- Manuscript Accepted: 17 NOV 2013
- Manuscript Revised: 14 NOV 2013
- Manuscript Received: 19 AUG 2013
- atypical vascular lesions;
- in situ hybridization;
- secondary angiosarcoma;
- soft tissue tumors
MYC amplification occurs in post-radiation and chronic lymphedema-associated secondary angiosarcoma and some primary angiosarcomas. In this study, we tested the ability of automated dual-color dual-hapten in situ hybridization (DISH) staining to discriminate secondary angiosarcoma from radiation-associated atypical vascular lesions (AVL), and to correlate with fluorescence in situ hybridization (FISH) for MYC amplification.
Cases of secondary angiosarcoma, including 11 biopsies and 3 excisions from 11 patients, and 5 AVL biopsies from 5 patients, were examined by FISH and DISH. DISH staining was performed using the Dual Color Open Probe software on a Ventana Benchmark XT automated slide stainer. Metallic black silver (MYC) and reference CHR8 red signals were qualitatively and semi-quantitatively enumerated for tumor nuclei. Small and large clusters of silver signals were recorded as 6 or 12 signals, respectively. MYC amplification was defined as MYC/CHR8 ratio >2.0.
Where tissue was available for both DISH and FISH, all secondary angiosarcoma cases showed MYC amplification (11/11 = 100%) by both DISH and FISH. All AVL were negative for MYC amplification by both techniques (0/5 = 0%).
In the current cohort, use of DISH identified all MYC amplified cases, and distinguished secondary angiosarcoma from AVL. DISH staining may be useful in distinguishing secondary angiosarcoma from AVL in challenging cases.