What stomach constraint would you accept in abdominal reirradiation?

For patients with at least one year interval, we reduce the standard GI luminal constraints by 10%. We use a point dose constraint as well as a 40 cc constraint. We almost always use 1.5, 1.8, or 2 Gy per fraction. For example, for 45 Gy in 25 fractions or 39 Gy in 26fx fractions BID, we would allow...