CXCR4 and neoplasm: The biodistribution of [177Lu]Lu-DOTA-POL3026 was studied in U87-CXCR4 + tumour-bearing mice, demonstrating uptake in the tumour with high tumour-to-blood and tumour-to-muscle ratios at 24 h p.i. However, uptakes in the kidneys, liver, lungs, and spleen were even higher.