Abstract: Disclosed are a bispecific recombinant protein and a use thereof. The bispecific recombinant protein comprises a first functional binding region, a second functional binding region and an Fc region; the first functional binding region comprises a first chain and a second chain, and a C-terminus of the first chain and a C-terminus of the second functional binding region are separately connected to an N-terminus of the Fc region directly or by means of a linker sequence; and a C-terminus of the second chain is connected to an N-terminus of the second functional binding region directly or by means of a linker sequence. Further disclosed is an application of the recombinant protein in terms of anti-tumor, anti-virus, liver disease treatment, and other applications. The recombinant protein may significantly improve the killing efficacy of target cells while significantly reducing toxic side effects caused by binding to non-target cells, and has good safety and good freeze-thaw stability.

Abstract: A GPC3-targeting antibody-interferon ? fusion protein and a use thereof are disclosed in this invention. The fusion protein consists of an A chain and a B chain; wherein the amino acid sequence of the A chain is as shown in SEQ ID NO: 1, and the amino acid sequence of the B chain is as shown in SEQ ID NO: 2. The killing effect on target cells, especially tumor cells, can be significantly improved, and toxic side effects caused by binding to non-target cells are significantly reduced. The fusion protein has better safety, lower production cost, and good freeze-thaw stability.

Abstract: The present invention relates to the field of bio-pharmaceuticals and, in particular, to an anti-Siglec-15 antibody or an antigen binding fragment thereof, a nucleic acid sequence encoding the anti-Siglec-15 antibody of the present invention or an antigen binding fragment thereof, an expression vector containing the nucleic acid sequence, a host cell containing the expression vector, a composition or a bispecific antibody comprising the anti-Siglec-15 antibody of the present invention or an antigen binding fragment thereof, an immune conjugate comprising the anti-Siglec-15 antibody of the present invention or an antigen binding fragment thereof linked to a therapeutic agent, as well as use of the anti-Siglec-15 antibody of the present invention or an antigen binding fragment thereof in the preparation of a medicament for treatment of cancer.