Different staining pattern in metastases from the same animal. Stained sections from two different metastases from the same rat treated with 177Lu-DOTA-BR96. The metastases were located retroperitoneally adjacent to the right (a and b) and left kidneys (c and d). Staining with BR96 was scored as 2 (a) and as 1 (c), and was not related to proliferation. The results for Ki67 are shown in b and d. Scale bars represent 50 μm.