PET summation images (0-90 min) in horizontal (upper panel) and coronal view (lower panel) depicting [11C]Erlotinib distribution in one H2-c-fosLTR/Egfrwt mouse (M125). Anatomical structures are labelled with arrows (T, tumor; L, liver; H, heart; B, brain). Scale bars: 1cm Concentration-time curves of [11C]Erlotinib in bone tumors in right scapula of three H2-c-fosLTR/Egfrwt mice measured with PET. Broken line indicates threshold for in vitro effect of Erlotinib (1 µM) 