Mine was traditional photon radiation with concurrent chemotherapy. This can be more debilitating than sequential treatments but it is also more effective. Think 1+1=3. The chemo injures the DNA weakening it and making the cancer's DNA more susceptible to the destruction by the radiation and the damage the radiation causes the DNA making it more susceptible to the chemo. The cells with the damaged DNA cannot reproduce when it's time for them to split.

My mass continued to shrink and consolidate for two years after treatment ended.

Btw, the proton radiation does less damage to surrounding tissue.