The use of proton beam therapy is expanding to include a diverse range of tumor sites, thanks to emerging research revealing the effectiveness of this advanced radiation treatment modality. Originally used in the treatment of prostate, brain, and pediatric tumors, we are seeing more and more types of tumors being treated with proton therapy. This is due to its ability to precisely deliver large amounts of cancer-fighting radiation directly to tumor sites while producing minimal side effects and reducing exposure to surrounding organs.