Example 11
Mice bearing a single CT26 tumor on one flank received a four intratumoral injections of a cytokine mRNA mixture of IL-15 sushi, GM-CSF, IFNα, and IL-12sc (ModB; SEQ ID NOs: 53, 41, 59, and 47). Blood was collected 13 days after first intratumoral mRNA administration and T cells specific for the gp70 tumor antigen were quantified by flow cytometry. Frequency of T cells specific for the gp70 tumor antigen in blood were strongly increased in mice upon intratumoral injection of mRNA cytokines compared to mice that had received control RNA.