Hematoxylin–eosin staining reagent was purchased from Beijing Zhongshan Jinqiao Co., Ltd. (Beijing, China). Antibodies were purchased from Fuzhou Maixin Biotechnology Development Co., Ltd. (Fuzhou, China) (Table 1). Immunohistochemical staining was performed by EnVision's two-step method. The main immunohistochemical markers were CKpan, CD34, CD31, FLI-1, EMA, INI-1, S100, SOX-10, HHV8, Desmin and Ki-67. Two pathologists re-evaluated the sections.

Antibodies used in immunohistochemistry and their sources

AntibodyClone numberMonoclonal/PolyclonalPositive site
CK (pan)MX005monoclonalcytoplasm
CD34QBEnd/10monoclonalcell membrane and cytoplasm
CD31JC/70Amonoclonalcell membrane
FLI-1MX045monoclonalnucleus
ERGMXR004monoclonalnucleus
INI-1MRQ-27monoclonalnucleus
S1004C4.9monoclonalcytoplasm/nucleus
SOX-10EP268monoclonalnucleus
DesminD33monoclonalcytoplasm
VimentinV9monoclonalcytoplasm
EMAE29monoclonalcytoplasm/cell membrane
HHV813B10monoclonalnucleus
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