– Sotiburafusp alfa is a humanized bispecific fusion protein comprising a VEGFR-1 extracellular domain fragment (129-228, 1-100 in the current sequence) connected through a 101 GGSGGSGGSGGSGGS 115 peptide linker to the N-terminus (116-564) of a humanized IgG1-kappa anti-human PD-L1 heavy chain with L352>A and L353>A mutations. Additionally, sotiburafusp alfa functions as an angiogenesis inhibitor [1].