Abstract
Interferons (IFNs) are well-known immunostimulants involved in both innate and adaptive immune responses. These multifunctional proteins mediate an early antiviral response and have pronounced immunomodulatory and antiproliferative properties. Due to their potency, IFNs have been used not only in the treatment of viral infections but also various other diseases. However, the use of IFNs in antitumor therapy has been limited by the frequent severe side effects, which reduced their appeal for the treatment of cancer. In this review, we focused on current data on recombinant IFNs used for anticancer therapy, as well as the development of promising IFN-based gene therapy approaches, with a focus on their safety and therapeutic efficacy. We also highlighted various types of IFNs and their application niches in the treatment of not only cancers in combination therapy but also of certain rare diseases. Taken together, this review improves our understanding of the existing IFN applications in cancer therapy, the disadvantages of using IFNs, and possible approaches for their improvement.