One of the radiotracers, 68Ga-DOTA-ADX-CG34, showed the highest tumor uptake with 6.2 ± 0.5% ID/g in CMKLR1-positive DU4475 (TNBC) xenograft models, while 68Ga-DOTA-AHX-CG34 presented the highest T/B ratio of 5.9 ± 0.7 at 1 h p. i., and 68Ga-DOTA-KCap-CG34 the lowest kidney and liver uptake. Here, CMKLR1 is linked to neoplasm.