Rochester, MN (KROC-AM News) – Mayo Clinic is reporting what it describes as a breakthrough in treatment approach for one of the most challenging cancers. The results of Mayo Clinic’s phase 2 study of the use of short-course hypofractionated proton beam therapy incorporating advanced imaging techniques was recently published in The Lancet Oncology. The study involved patients in Minnesota and Arizona, over the age of 65, diagnosed with grade 4 malignant glioblastoma.