Here we are, decades beyond the first use of proton beam therapy in a clinical setting in the US, and insurance companies still call it experimental. For me, this is annoying. For those who want proton therapy but are denied insurance coverage because of its “experimental” status, this is much worse than merely annoying. When a cancer patient who recognizes proton therapy as their best option for controlling their cancer while minimizing the risk of side effects is told they cannot have it, the denial can be devastating. Inspired by yet another insurance rejection …