| abstract |
The present invention relates to the field of disease treatment and immunology, in particular, the present invention relates to anti-PD-1 antibodies or antigen-binding fragments thereof, nucleic acid molecules encoding them, methods for preparing them, and pharmaceutical compositions containing them. The present invention further relates to the use of the antibody (especially the humanized antibody) or antigen-binding fragment thereof in the preparation of a medicament for improving immune cell activity, enhancing immune response, or for preventing and/or treating tumors or infection. |