In multiple subcutaneous and orthotopic tumor xenograft mouse models, Lutetium-177 labeled DUNP19 ([177Lu]Lu-DUNP19) enabled non-invasive imaging and molecularly precise radiotherapy to LRRC15-expressing cancer cells and murine cancer-associated fibroblasts, effectively halting tumor progression and prolonging survival with minimal toxicity. This evidence concerns the gene LRRC15 and cancer.