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Volume 15, Number 1, 2010

The role of high-dose-rate brachytherapy boost in breast-conserving therapy: Long-term results of the Hungarian National Institute of Oncology

Csaba Polgár,  Levente Jánváry, Tibor Major, András Somogyi,
Zoltán Takácsi-Nagy, Georgina Fröhlich, János Fodor

Summary:

Aim: To report the long-term results of high-dose-rate (HDR) brachytherapy (BT) boost for
breast cancer patients treated with conservative surgery and radiotherapy.
Materials and methods: Between 1995 and 2007, 100 early-stage breast cancer patients received an HDR BT boost after conservative surgery and whole breast irradiation. Ten patients (10%) received a single-fraction HDR boost of 8–10.35 Gy using rigid needles, while 90 (90%) were treated with a fractionated multi-catheter HDR BT boost. The latter consisted of 3×4Gy (n = 19), 3×4.75 Gy (n = 70), and 2×6.4 Gy (n = 1). Breast cancer related events, cosmetic results and side effects were assessed.
Results: At a median follow-up time of 94 months (range: 8–152) only 7 (7%) ipsilateral breast
failures were observed for a 5- and 8-year actuarial rate of 4.5 and 7.0%, respectively. The 8-
year disease-free, overall, and cancer-specific survivalwas 76.1, 82.8, and 80.4%, respectively.
Cosmetic outcome was rated excellent in 17%, good in 39%, fair in 33%, and poor in 11%.
Data on late radiation side effects were available for 91 patients (91%). Grade 3 fibrosis and
grade 3 telangiectasia occurred in 6 (6.6%) and 2 (2.2%) patients, respectively. In univariate
analysis only positive margin status had a significant negative effect on local control.
Conclusions: HDR BT boost using multi-catheter implants produce excellent long-term local
tumour control with acceptable cosmetic outcome and lowrate of grade 3 late radiation side
effects.

Signature: Rep Pract Oncol Radiother, 2010; 15(1) : 1-7


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