Angiosarcomas are rare, generally aggressive, malignant mesenchymal tumours of vascular origin and constitute less than 1% of all sarcomas. Their most frequent site of origin is the head and neck, especially the scalp, of elderly men. Angiosarcomas are likely derived from vascular endothelial cells, possibly resulting from aberrant angiogenesis. Studies have shown relatively increased expression of vascular endothelial growth factor (VEGF) and its receptors (VEGFr1-3) in human angiosarcoma. The most common gene mutation in angiosarcomas is KRAS as well as other RAS mutations. Activation of the RAS pathway is often tumorigenic. Although immortalised murine endothelial cells form benign haemangiomas in vivo, the addition of activated HRAS produces rapidly growing, poorly differentiated angiosarcomas.
Human diseases [BR:br08402]
Cancers of soft tissues and bone
Human diseases in ICD-11 classification [BR:br08403]
Malignant neoplasms, except primary neoplasms of lymphoid, haematopoietic, central nervous system or related tissues
Malignant neoplasms, stated or presumed to be primary, of specified sites, except of lymphoid, haematopoietic, central nervous system or related tissues
Malignant mesenchymal neoplasms
2B56 Angiosarcoma, primary site