An analysis of 16 patients with metastatic BC, conducted bySörensen et al. [74], demonstratedgood visualization of small-sized foci, enabling the detection of breast cancermetastases in the liver, bones, lymph nodes, brain, and other organs.Furthermore, in two patients after the [68Ga]Ga-ABY-025 study, theHER2 status in the primary breast tumor was changed from negative to positive.In most cases, differences in HER2 expression between the primary tumor andmetastatic foci were found. Here, ERBB2 is linked to neoplasm.