Tissue sample
preparation for
immunohistochemical evaluation was carried out in the Histology and
Tissue Analysis Core at Dell Pediatric Research Institute (DPRI) at
The University of Texas at Austin. The formalin-fixed tumor tissues
were embedded in paraffin wax, sectioned, and stained with an antibody
against CD-31 (Abcam, Cambridge, MA, USA) as a marker for angiogenesis
(n = 3).41 (link) Slides were
then scanned, and images were taken using the ScanScope XT (Aperio
Technologies, Vista, CA, USA).