EGFR and neoplasm: Mice bearing human A431 epidermoid subcutaneous tumour xenografts of small size with a mean tumour volume of 26.6 mm3 (N = 6; range 7-54 mm3; Table 2) received the anti-EGFR nanobody 99mTc-D10 that accumulated in the tumour and generated a high tumour to tissue contrast determined by in vivo and ex vivo biodistribution analysis.