Single-Fraction Very Accelerated Partial Breast Irradiation (sfVAPBI)

Summary

To investigate clinical outcomes, late side effects, and cosmetic results of a single-fraction very accelerated partial breast irradiation as postoperative local treatment for the treatment of early stage breast cancer.

Eligibility

Inclusion Criteria:

* Stage 0 \& I \& II (\< 3 cm) breast carcinoma
* Lesions of \< 3 cm diameter
* Invasive carcinoma of any subtype and grade or ductal carcinoma in situ (DCIS)
* Nodal status: node-negative (pN0) or micro-metastatic (pN1mi) (patients with pN1mi status can be treated, but due to the limited clinical evidence, individual decision is needed)
* M0: Absence of distant metastasis
* Clear resection margins by National Surgical Adjuvant Breast and Bowel Project (NSABP) definition (no tumor on ink)
* Unifocal (multifocality limited within 2 cm) and unicentric breast cancer
* Age\> 40 years
* Luminal A or B tumors
* Time interval from surgery preferably less than 12 weeks and no longer than 20 weeks, and from adjuvant chemotherapy less than 4 weeks
* Human Epidermal growth factor Receptor 2 positive (HER2+) patients receiving postoperative anti-HER2 systemic therapy
* Specific signed consent form prior to randomization

Exclusion Criteria:

* Stage III-IV breast cancer
* Surgical margins that cannot be microscopically assessed
* Extensive intraductal component (EIC+)
* Extensive lymphovascular invasion (LVI+) (focal is allowed)
* Triple negative breast cancer
* BReast CAncer gene (BRCA) 1-2 mutation
* Human Epidermal growth factor Receptor 2 positive (HER2+) patients not receiving postoperative anti-HER2 systemic therapy
* Neoadjuvant systemic therapy
* Paget's disease or pathological skin involvement
* Synchronous or previous breast cancer.
* Pregnant or lactating women

Conditions3

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