Recombinant Anti-HER2 x Anti-HER3 Bispecific Antibody (scDiabody-CH3) is a fusion protein of two scDiabodies connected together by a CH3 region. In single-chain Diabodies, an additional connecting linker is introduced between chains of the anti-HER2/anti-HER3 diabody. The scDiabody with two specificities is fused to each of the CH3 chains to extend half-life. This BsAb can bind and inactivate two receptors simultaneously. It is designed for the research of Breast cancer; Gastric cancer; Prostate cacncer; Ovarian cancer; Solid tumors therapy.