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The Effect of Delaying Radiation Therapy for Systemic Chemotherapy on Local-regional Control in Breast Cancer

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Abstract

Background. It remains controversial as to whether the administration of chemotherapy prior to radiation following the surgical treatment for localized breast cancer compromises local control.

Methods. The outcome of 290 patients who received chemotherapy prior to breast or chest wall irradiation following curative breast cancer surgery was retrospectively analyzed to determine if delaying radiation from the time of surgery adversely affects local-regional control. The patients were divided into three groups according to the time interval from definitive surgery to the start of radiation: group 1, <5 months; group 2, 5 to <7 months, and group 3, 7+ months. Local-regional and distant failure events were analyzed according to the time delay from surgery to radiation.

Results. The median follow-up was 6.0 years (range, 7 months to 15 years). Loco-regional failure was observed in 22 patients, 18 of which occurred within the original radiation fields. There was no significant adverse effect on local control or distant failure from delaying radiation for systemic chemotherapy. Univariate and multivariate analyses revealed that positive margins after surgery were associated with increased local recurrence.

Conclusion. Delaying radiation therapy for greater than 7 months, in order to administer chemotherapy following curative breast cancer surgery, does not compromise local control. However, positive margins were significantly associated with higher rates of local failure and even an increase in radiation boost dose was not able to fully counteract the increased risk of local failure.

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Authors and Affiliations

  1. Department of Radiation Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA

    Torunn I. Yock, Alphonse G. Taghian, Lisa A. Kachnic, John J. Coen, S.I. Assaad & Simon N. Powell

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  1. Torunn I. Yock
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  2. Alphonse G. Taghian
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  3. Lisa A. Kachnic
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  6. Simon N. Powell
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Yock, T.I., Taghian, A.G., Kachnic, L.A. et al. The Effect of Delaying Radiation Therapy for Systemic Chemotherapy on Local-regional Control in Breast Cancer. Breast Cancer Res Treat 84, 161–171 (2004). https://doi.org/10.1023/B:BREA.0000018414.36274.72

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  • DOI: https://doi.org/10.1023/B:BREA.0000018414.36274.72

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