Fig. 2From: Dose escalation biodistribution, positron emission tomography/computed tomography imaging and dosimetry of a highly specific radionuclide-labeled non-blocking nanobodya Tumor-to-organ ratios for different masses of 68Ga-NOTA-Nb109 in C57-hPD-L1 transgenic MC38-hPD-L1 tumor-bearing mice (n = 3) at 90 min after the tracers injection. b Fitting curves of tumor-to-muscle ratios or serum Nb109 concentration (**P < 0.01, *P < 0.05). P values were calculated vs. 1 μg group by a two-sided testBack to article page