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Radiotherapy Omission in Low Risk Ductal in Situ Carcinoma Breast

NCT03878342 · Status: ACTIVE_NOT_RECRUITING · Phase: NA · Type: INTERVENTIONAL · Enrollment: 295

Last updated 2026-01-23

No results posted yet for this study

Summary

Following breast-conserving surgery (BCS) for localized ductal carcinoma in situ (DCIS) of the breast, whole-breast irradiation (WBRT) is a standard of care, reducing the absolute rate of in-breast recurrences (IBR) by more than 15% at 10 years, from 28% without radiotherapy to 13 % with radiotherapy. Half of the recurrences occurred as invasive disease. Whereas in the comparative trials, WBRT did not impact on overall survival, survival of patients who recurred with invasive cancers was impaired in comparison to patients who did not recur, or to patients with DCIS-only recurrences.

Using criteria based on age, tumor size, nuclear grade, and margins status, several trials and cohort studies failed to identify subgroups of patients at low risk, who could be safely spared the need for WBRT. The Radiation Therapy Oncology Group (RTOG) DCIS trial included patients treated with BCS for low- or intermediate grade DCIS revealed by unifocal microcalcifications, size ≤25 mm, margins ≥3 mm, and no residual microcalcifications after surgery. The 5-year rates of IBR were 3.5 % without radiotherapy, versus 0.4 % with radiotherapy, and 6.7 % and 0.9 % at 7 years, respectively (p \<0.001). Sixty percent of the patients received tamoxifen in both groups.

Several studies showed that the same molecular classes were identified in DCIS as in invasive cancers. Studies suggested that low proliferation, hormone receptors expression, and lack of ERBB2 amplification were associated with a low risk of IBR in patients not receiving radiotherapy. A combined signature was tested in the Eastern Cooperative Oncology Group (ECOG) trial, showing a 10% IBR rate at ten years in patients with a low-risk.

Identifying very low-risk DCIS, using biological markers in addition to the clinical and histological markers of low-risk DCIS, could help to select patients who could be safely avoided WBRT following BCS. It would avoid over-treatment in these women and could decrease the cost of management.

Conditions

  • DCIS
  • Breast Cancer
  • Low Risk DCIS
  • Breast Conserving Surgery
  • Radiotherapy Omission

Interventions

RADIATION

Radiotherapy

two fractionation regimens will be allowed for whole-breast irradiation: 50 Gy in 25 fractions over 5 weeks or 40 Gy in 15 fractions over 3 weeks. The delivery of an additional dose to the tumour bed (boost) will be at the referring physician discretion, according to the guidelines

OTHER

No Radiotherapy

No Irradiation- Active surveillance

Sponsors & Collaborators

  • The French National Cancer Institute

    collaborator UNKNOWN

  • UNICANCER

    lead OTHER

Principal Investigators

  • Alain FOURQUET, MD · Institut Curie

Study Design

Allocation
RANDOMIZED
Purpose
OTHER
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
50 Years
Sex
FEMALE
Healthy Volunteers
No

Timeline & Regulatory

Start
2019-05-10
Primary Completion
2029-11-14
Completion
2034-11-14

Countries

  • France

Study Locations

More Related Trials

Entities

Diseases

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT03878342 on ClinicalTrials.gov