Abascal et al. recently used murine CD103 + cDC1 (conventional DC type I) cells to produce soluble FLT3L (FLT3L cDC1) and conducted in situ vaccination experiments on anti-PD1 resistant murine NSCLC models and reported enhanced anti-tumor efficacy compared to non-modified cDC1 cells. Here, FLT3LG is linked to neoplasm.