- for radiotherapy 3 levels: 41.4 Gy/1.8 Gy/f; 45 Gy/1.8 Gy/f; 50.4 Gy/1.8 Gy/f basel level being : 41.4 Gy and 50% of standard CT doses The phase I is conducted with increasing doses of each component with 9 levels.