Recombinant Anti-HER2 x Anti-VEGF Bispecific Antibody (scFv4-Ig) is an appended IgG format, which includes four scFv moieties at the N-termini of the constant regions. It is a bivalent homodimer, in which one anti-HER2 scFv is fused to the CH1 domain of a heavy chain and another anti-VEGF scFv to the CL domain of a light chain, or vice versa. The resulting leads to 2+2 antigen-binding valency. This BsAb can bind two factors simultaneously and inhibit cell proliferation. It is designed for the research of Colorectal cancer; Breast cancer; Lung cancer; Renal cell cancer (RCC); Glioma cancer; Glioblastoma; Ovarian cancer therapy.