Tumor tracer uptake of all three tracers correlated positively with the positive fraction for CAIX, with an R of 0.42 (p = 0.29), 0.91 (p = 0.01), and 0.32 (p = 0.48), respectively, for affibody-based, F(ab′)2-fragment based and whole antibody-based tracer. This evidence concerns the gene CA9 and neoplasm.