Bone Tumour Radiology — Topic Test
9 questions · exam mode (answers revealed at the end). 18 min suggested.
A 43-year-old woman undergoing fractionated external beam radiotherapy for a deep-seated tumour. The radiation oncologist explains that delivering the dose in multiple small fractions rather than a single large dose spares late-responding normal tissues. This therapeutic gain from fractionation is BEST explained by which of the four 'R's of radiobiology that allows normal tissue with a low alpha/beta ratio to recover between fractions?
ARepopulation of clonogens
BRedistribution within the cell cycle
CReoxygenation of hypoxic cells
DRepair of sublethal damage