Before we get too excited about this new treatment, it’s important to point out that it’s thought that only around one per cent of UK cancer patients could be suitable for proton therapy. There’s also a lack of hard conventional evidence to prove that it’s more effective and kinder than conventional radiotherapy.

http://scienceblog.cancerresearchuk.org/2013/09/16/proton-therapy-is-coming-to-the-uk-but-what-does-...