MSLN and neoplasm: All anti-MSLN PET agents demonstrated significantlyhigher tumor uptake (p ≤ 0.05) at 18, 48,and 96 h as compared to the negative control [89Zr]Zr-VH-Fc Ab6, while only the anti-MSLN VH-Fcs PET agents (2A10, 3C9)demonstrated significantly higher tumor uptake at 144 h (p ≤ 0.01).