Key clinical point: Proton beam therapy can effectively treat regional nodes while largely sparing cardiac tissues.
Major finding: There were no cases of grade 3 or greater radiation pneumonitis and no grade 4 toxicities.
Study details: Prospective study in 69 women with nonmetastatic breast cancer.
Disclosures: The study was supported by a grant from the National Institutes of Health. Dr. Jimenez disclosed research funding from Focal Therapeutics.
Jimenez RB et al. J Clin Oncol. 2019 Aug 26. doi: 10.1200/JCO.18.02366.