# A Trial of 15 Fraction vs 25 Fraction Pencil Beam Scanning Proton Radiotherapy After Mastectomy in Patients Requiring Regional Nodal Irradiation

> **NCT02783690** · PHASE2 · COMPLETED · sponsor: **Mayo Clinic** · enrollment: 88 (actual)

## Conditions studied

- Breast Cancer

## Interventions

- **RADIATION:** Hypofractionation

## Key facts

- **NCT ID:** NCT02783690
- **Lead sponsor:** Mayo Clinic
- **Sponsor class:** OTHER
- **Phase:** PHASE2
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 2016-05-18
- **Primary completion:** 2020-10-21
- **Final completion:** 2023-11-18
- **Target enrollment:** 88 (ACTUAL)
- **Last updated:** 2025-12-04


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT02783690

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT02783690, "A Trial of 15 Fraction vs 25 Fraction Pencil Beam Scanning Proton Radiotherapy After Mastectomy in Patients Requiring Regional Nodal Irradiation". Retrieved via AI Analytics 2026-07-15 from https://api.ai-analytics.org/clinical/NCT02783690. Licensed CC0.

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