18Ffluoroazomycinarabinofuranoside (18FAZA) is recently synthesized and introduced as a hypoxia tracer in various tumor-bearing mice using PET and autoradiography with promising results. (17). 18FAZA showed also superior biokinetics in comparison to 18F-MISO in animals (18). The safety and feasibility of FAZA was evaluated recently in 10 patients with advanced squamous cell carcinoma of the head and neck. The authors of this study concluded that PET imaging with FAZA appears to be safe and feasible in patients with head and neck tumors. (19).