In our murine TNBC model, the injection of [177Lu]Lu-DOTAGA-GARP induced a significant reduction in tumour growth from 8 days after injection compared to mice treated with vehicle (PBS) or unlabelled DOTAGA-GARP suggesting that the mechanism of action inhibiting tumour growth is mainly due to the radiation emitted by 177Lu. Here, LRRC32 is linked to neoplasm.