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Proton Therapy for Isolated Local Regional Recurrence of Breast Cancer After Mastectomy Alone

Abstract

Purpose/objectives: To assess adverse events (AEs) and disease-specific outcomes after proton therapy for isolated local-regional recurrence (LRR) of breast cancer after mastectomy without prior radiotherapy (RT).

Materials/methods: Patients were identified from a multi-institutional prospective registry and included if diagnosed with invasive breast cancer, initially underwent mastectomy without adjuvant RT, experienced an LRR, and subsequently underwent salvage treatment, including proton therapy. Follow-up and cancer outcomes were measured from the date of RT completion.

Results: Nineteen patients were included. Seventeen patients were treated with proton therapy to the chest wall and comprehensive regional lymphatics (17/19, 90%). Maximum grade AE was grade 2 in 13 (69%) patients and grade 3 in 4 (21%) patients. All patients with grade 3 AE received > 60 GyE (p=0.04, Spearman correlation coefficient=0.5). At the last follow-up, 90% of patients were alive with no LRR or distant recurrence.

Conclusions: For breast cancer patients with isolated LRR after initial mastectomy without adjuvant RT, proton therapy is well-tolerated in the salvage setting with excellent loco-regional control. All grade 3 AEs occurred in patients receiving > 60 GyE.

References
1.
Patel S, Lu H, Nyamwanda J, Jimenez R, Taghian A, MacDonald S . Postmastectomy radiation therapy technique and cardiopulmonary sparing: A dosimetric comparative analysis between photons and protons with free breathing versus deep inspiration breath hold. Pract Radiat Oncol. 2017; 7(6):e377-e384. DOI: 10.1016/j.prro.2017.06.006. View

2.
Hernandez M, Zhang R, Sanders M, Newhauser W . A treatment planning comparison of volumetric modulated arc therapy and proton therapy for a sample of breast cancer patients treated with post-mastectomy radiotherapy. J Proton Ther. 2017; 1(1). PMC: 5669383. DOI: 10.14319/jpt.11.9. View

3.
DeCesaris C, Rice S, Bentzen S, Jatczak J, Mishra M, Nichols E . Quantification of Acute Skin Toxicities in Patients With Breast Cancer Undergoing Adjuvant Proton versus Photon Radiation Therapy: A Single Institutional Experience. Int J Radiat Oncol Biol Phys. 2019; 104(5):1084-1090. DOI: 10.1016/j.ijrobp.2019.04.015. View

4.
MacDonald S, Patel S, Hickey S, Specht M, Isakoff S, Gadd M . Proton therapy for breast cancer after mastectomy: early outcomes of a prospective clinical trial. Int J Radiat Oncol Biol Phys. 2013; 86(3):484-90. DOI: 10.1016/j.ijrobp.2013.01.038. View

5.
Straus K, Lichter A, Lippman M, Danforth D, Swain S, Cowan K . Results of the National Cancer Institute early breast cancer trial. J Natl Cancer Inst Monogr. 1992; (11):27-32. View