A sacral chordoma requires a high radiotherapy dose but abuts bowel, sacral nerve roots and other dose-limiting normal tissues. Which statement most

Question

A sacral chordoma requires a high radiotherapy dose but abuts bowel, sacral nerve roots and other dose-limiting normal tissues. Which statement most accurately justifies specialist consideration of proton rather than photon planning without overstating the evidence?

Accepted Answer

Lower exit and integral normal-tissue dose can improve the high-dose therapeutic ratio

Answer

Protons improve survival for most cancers and are therefore the routine NHS radiotherapy modality

Answer

Protons are intrinsically curative for every chordoma because their relative biological effectiveness is several-fold higher than photons

Answer

Protons eliminate the need for immobilisation, image guidance and multidisciplinary target delineation

Answer

Protons have no entrance dose or range uncertainty, so organ-at-risk constraints can be ignored

Proton Beam Therapy — SCE Medical Oncology MCQ

A sacral chordoma requires a high radiotherapy dose but abuts bowel, sacral nerve roots and other dose-limiting normal tissues. Which statement most accurately justifies specialist consideration of proton rather than photon planning without overstating the evidence?