The review presents the information on the use of monoclonal antibodies (MAbs) in the treatment of cancer. The mechanisms of MAbs action, their types, methods of production and the main approaches to their use in cancer therapy are considered. Modern MAb drugs are approved for use and are used for the treatment of hematological and solid malignancies. They are targeted drags due to their effects on specific molecules involved in the mechanisms of carcinogenesis and tumor growth. The presented data show that the synthesis and production of monoclonal antibodies, as well as their conjugation with drugs or radionuclides, have advanced significantly over the past decades. The methods of tumor immunotherapy discussed in the article have either already shown their effectiveness in the treatment of malignancies or are at various phases of clinical trials. The development of modern, more advanced technologies will help solve existing problems and make the treatment of cancer patients more effective and safer. © 2024 Geotar Media Publishing Group. All rights reserved.