Fig. 1

Two representatives 18F-Alfatide II PET/CT scans of responding tumors (a SUVmax = 5.18) and non-responding tumors (b SUVmax = 9.80). (Top panel) Scans from a patient with 18F-Alfatide uptake at baseline and 4 weeks after CCRT who showed a partial response to CCRT, and (bottom panel) scans from another patient with stable disease