Recombinant Anti-CEA x Anti-TNFα Bispecific Antibody (Tandem Fab) is designed to be expressed as three chains derived from the variable domains of anti-CEA and anti-TNFα parental antibodies. It contains a His-tag for affinity purification. And the two Fd regions are connected by a flexible linker. This BsAb can retarget cytokine (TNFα) to tumor cells. It is designed for the research of Breast cancer; Ovary cancer; Colon cancer; Lung cancer therapy.