The purpose of this clinical study is to assess the effectiveness of IORT, using an electronic brachytherapy system, in patients with limited-volume in situ and early stage breast cancer, with endpoints of:
* Local recurrence in early stage breast cancer patients treated with IORT.
* Toxicity associated with IORT.
* Long-term disease-specific and overall survival
* Cosmetic results using the Harvard Scale at start and follow-up periods in patients treated with IORT.
* Quality of life in patients treated with IORT.
* Health care costs associated with IORT.
