Recurrent, Tumor Mutation Burden-High, Cutaneous Angiosarcoma of the Scalp Treated with Pembrolizumab. - Amagai, Ryo; Fujimura, Taku; Kambayashi, Yumi; Ohuchi, Kentaro; Yamazaki, Emi; Hashimoto, Akira; Asano, Yoshihide (Case Reports in Oncology, 2023)