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Receptor Positive or Progesterone Receptor Positive Ductal Carcinoma In Situ of the Breast Who Are Receiving Tamoxifen or Anastrozole","Randomised Trial Testing Observation (No Radiotherapy) Against Radiotherapy In Women With Low-Risk Completely Excised ER Positive Ductal Carcinoma In Situ (DCIS) Of The Breast On Adjuvant Endocrine Therapy","DISEASE CHARACTERISTICS:\n\n* Diagnosis of unifocal ductal carcinoma in situ of the breast without an invasive component\n\n  * Microinvasion (defined as 1 or more foci of invasion each \\\u003C 1 mm) allowed\n* Prior complete microscopic excision (within the past 6 months) with a minimum radial margin of 1 mm by specimen x-ray required\n* Maximum microscopic tumor diameter \\\u003C 30 mm (\\\u003C 15 mm if grade 3 tumor)\n* Planning to receive adjuvant tamoxifen or anastrozole for 5 years\n\n  * Eligible patients may receive adjuvant endocrine therapy on ICR-IBIS-II\n* Hormone receptor status:\n\n  * Estrogen receptor positive OR\n  * Progesterone receptor positive\n  * More than 10% tumor staining for receptor OR a cutpoint of ≥ 2\n\nPATIENT CHARACTERISTICS:\n\nSex\n\n* Female\n\nMenopausal status\n\n* Premenopausal, perimenopausal, or postmenopausal\n\nPerformance status\n\n* Not specified\n\nLife expectancy\n\n* Not specified\n\nHematopoietic\n\n* Not specified\n\nHepatic\n\n* Not specified\n\nRenal\n\n* Not specified\n\nCardiovascular\n\n* No prior deep vein thrombosis\n\nPulmonary\n\n* No prior pulmonary embolus\n\nOther\n\n* No unexplained postmenopausal bleeding\n* No contraindication to full-dose radiotherapy to the breast\n* No other cancer within the past 5 years except nonmelanoma skin cancer or carcinoma in situ of the cervix\n\nPRIOR CONCURRENT THERAPY:\n\nBiologic therapy\n\n* Not specified\n\nChemotherapy\n\n* Not specified\n\nEndocrine therapy\n\n* See Disease Characteristics\n* No prior tamoxifen or raloxifene use for more than 3 months in duration\n\nRadiotherapy\n\n* Not specified\n\nSurgery\n\n* See Disease 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