Ipsilateral breast tumor control following hypofractionated and conventional fractionated whole-breast irradiation for early breast cancer: a long-term follow-up.

There was no difference in IBTC between CF-WBI and HF-WBI in our patients. Positive surgical margin was a risk factor independently associated with IBTC rates after CF-WBI and HF-WBI. Further investigation is required to establish adequate treatment strategies for patients with positive surgical margins.