DC-targeting lentivectors for cancer immunotherapy

Lentivectors (LVs) induce sustained transgene expression and are attractive vaccine platforms for complex immune scenarios like cancer and persistent infections. This review summarises the literature on lentivectors with potential uses for in vivo immunotherapy, focussing on those targeting the most potent antigen-presenting cells: dendritic cells (DCs). There is a growing interest in myeloid-targeting therapies as, by influencing an early stage in the immune hierarchy, they can orchestrate a more diverse and complex targeted immune response. We dissect the nature of DC-targeting LVs and their induced immune responses to understand the state of the art, identify the knowledge gaps and guide efforts to maximise the generation of potent and effective immune responses. Lentivector-based vaccines provide several advantages over other vaccine platforms, such as directed tropism and limited vector immunogenicity, and have been shown to generate effective and sustained immune responses. Overall, DC-targeting lentivectors stand out as promising tools to be exploited in cancer immunotherapy, and new-generation LVs can further exploit the gained knowledge in the study of naturally occurring lentiviruses for a more directed and adjuvanted response.