# Radiation Therapy With or Without Optional Tamoxifen in Treating Women With Ductal Carcinoma in Situ

> **NCT00003857** · PHASE3 · COMPLETED · sponsor: **Radiation Therapy Oncology Group** · enrollment: 636 (actual)

## Conditions studied

- Breast Cancer

## Interventions

- **DRUG:** tamoxifen citrate
- **PROCEDURE:** adjuvant therapy
- **RADIATION:** radiation therapy

## Key facts

- **NCT ID:** NCT00003857
- **Lead sponsor:** Radiation Therapy Oncology Group
- **Sponsor class:** NETWORK
- **Phase:** PHASE3
- **Study type:** INTERVENTIONAL
- **Status:** COMPLETED
- **Start date:** 1999-12
- **Primary completion:** 2004-02
- **Final completion:** 2022-05-20
- **Target enrollment:** 636 (ACTUAL)
- **Last updated:** 2022-05-25

## Collaborators

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## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT00003857

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT00003857, "Radiation Therapy With or Without Optional Tamoxifen in Treating Women With Ductal Carcinoma in Situ". Retrieved via AI Analytics 2026-06-16 from https://api.ai-analytics.org/clinical/NCT00003857. Licensed CC0.

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