Deviations from the inverse relationship between tumor and normal tissue dose and RBE in fast neutron data are compatible with the presence of hypoxia, with possible applications to hypo-fractionated proton therapy

1

The study reveals that the expected inverse relationship between dose and RBE is altered in many in vivo situations, likely due to hypoxic effects.
2

A new model simulates RBE patterns for neutrons and protons, incorporating radiosensitivity changes and hypoxia-related reductions.
3

Results indicate that RBE responses differ among normal skin and two cancer types, with RBE shifting from oxic to hypoxic curves at higher doses.
4

The study suggests that similar RBE changes observed in neutron therapy may also apply to proton therapy, particularly in hypo-fractionated schedules.
5

Further experimental research is recommended to explore proton effects at similar dose ranges, which could enhance treatment strategies.

1