Proton therapy for head and neck paragangliomas: A single institutional experience.

BACKGROUND: Although slow growing, head and neck paragangliomas (HNPG) can cause significant morbidity. We evaluated the efficacy of proton therapy in the management of HNPG.

METHODS: Retrospective review of an institutional proton therapy experience of treating patients between 1997 and 2016; 37 patients and 40 tumors were included.

RESULTS: Proton therapy was delivered to a median of 50.4 Gy(RBE) (range: 45-68). Having a genetic/family predisposition for HNPG was associated with multifocal tumors (P = .02) and younger diagnosis age (P = .02). Twenty-six (70%) patients had symptom improvement posttreatment, and 65% of treated tumors showed ≥20% volumetric shrinkage. The 5-year recurrence-free and overall survival rates were both 97%. Grade 2 to grade 3 toxicities (54%) included subjective hearing impairment (19%), middle ear inflammation (14%), and dry mouth (8%). There were no grade 4-5 toxicities.

CONCLUSIONS: Patients with HNPGs can be effectively and safely treated with proton therapy with excellent tumor control, successful volumetric tumor reduction, and symptomatic improvement.