This cluster of papers focuses on the research and clinical aspects of vascular tumors, particularly angiosarcoma and epithelioid hemangioendothelioma. It covers topics such as treatment outcomes, diagnostic markers, genetic alterations, risk factors, and therapeutic options for various types of vascular tumors. The cluster also explores the impact of radiation therapy on the development of angiosarcoma and the role of liver transplantation in managing hepatic angiosarcoma.