EGFR and neoplasm: Blood pool activity (mediastinal uptake) was observed at 6 h p.i but was not visible at 24 and 48 h p.i. Liver was the only normal organ visualized at all-time points but decreased at 24 and 48 h p.i. Kidneys were modestly visualized at 6 h p.i. but were not visible at 24 and 48 h p.i. IHC staining of excised tumours showed strong EGFR positivity (Fig. 3d).