# Radiation OmisSion in PAtients With CLinically Node Negative Breast Cancer Undergoing Lumpectomy

> **NCT05866458** · — · RECRUITING · sponsor: **Ontario Clinical Oncology Group (OCOG)** · enrollment: 352 (estimated)

## Conditions studied

- Breast Cancer

## Interventions

_None listed._

## Key facts

- **NCT ID:** NCT05866458
- **Lead sponsor:** Ontario Clinical Oncology Group (OCOG)
- **Sponsor class:** OTHER
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** RECRUITING
- **Start date:** 2024-03-12
- **Primary completion:** 2031-10
- **Final completion:** 2031-10
- **Target enrollment:** 352 (ESTIMATED)
- **Last updated:** 2025-11-18


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT05866458

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT05866458, "Radiation OmisSion in PAtients With CLinically Node Negative Breast Cancer Undergoing Lumpectomy". Retrieved via AI Analytics 2026-06-01 from https://api.ai-analytics.org/clinical/NCT05866458. Licensed CC0.

---

*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*