what is the “real difference” between a proton and a photon as it relates to the treatment of prostate cancer?

Proton-photon...it's all the same to me…. Comparing the two as it relates to the treatment of prostate cancer. Iceberg-Feinberg it's all the same to me. Commentary on Proton therapy-Cost and "bang for the buck" concerns. Did you know that for some prostate cancers a photon is better than a proton? I have asked a physicist, who I …