Abstract
The benefits of adjuvant whole-breast irradiation (WBI) after breast-conserving surgery are well established and WBI is a standard of care. In selected patients with early stage breast cancer, accelerated partial breast irradiation (APBI) has emerged as an alternative treatment option to WBI. Early trials of APBI have demonstrated an excellent local control rate and an associated good-to-excellent cosmetic outcome. APBI can reduce both the treatment volume and overall treatment time of adjuvant radiation therapy, which potentially overcomes logistical barriers associated with WBI that have previously prevented eligible women from pursuing breast-conserving therapy. Likewise, the addition of new modalities for APBI delivery has increased the number of patients who might be eligible for this adjuvant treatment—in the setting of breast-conserving surgery—despite the limited availability of long-term data on APBI outcomes compared to historical WBI outcomes. Ongoing phase III trials aim to compare APBI with WBI and also point the practitioner to the appropriate APBI patient selection criteria. Here, we review available modalities, patient selection criteria and consensus guideline recommendations, and current controversies in APBI.
Key Points
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Accelerated partial breast irradiation (APBI) is based on the principle that most early stage breast cancer recurrences are immediately adjacent to the index lumpectomy site
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APBI offers patients pursuing breast conserving therapy an effective and expedient option to receive the obligate radiation therapy following lumpectomy, in select cases
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Several innovative methods of delivering APBI include catheter and balloon or strut brachytherapy applicators, numerous intraoperative techniques, as well as the adaptation of more-traditional external-beam radiotherapy techniques
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There is a shortage of mature randomized controlled data with long-term follow-up comparing whole breast irradiation (WBI) to APBI in the management of early stage breast cancer
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Consensus guidelines have been developed to determine who might be appropriate candidates for APBI treatment, outside the auspices of a clinical trial
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Randomized prospective data of multicatheter interstitial brachytherapy comparing WBI with APBI has produced encouraging results; the use of APBI in select patients is supported by the NCCN in recent updated guidelines
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Cox, J., Swanson, T. Current modalities of accelerated partial breast irradiation. Nat Rev Clin Oncol 10, 344–356 (2013). https://doi.org/10.1038/nrclinonc.2013.65
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DOI: https://doi.org/10.1038/nrclinonc.2013.65
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