Conclusions
There is no optimal technique for APBI, all techniques have pros and cons
It is very difficult to directly compare the techniques partly because:
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They are fundamentally different
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Different definition of target and treated volume
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Different total dose, fraction number, dose/fraction
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Different timing in relation to surgery and systemic therapy
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Different demand for technical skills
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Different cost and cost-effectiveness
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Some techniques very dependent on breast size, localization of lumpectomy
cavity
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Different potential for causing acute and late morbidity
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Importantly also different local control rates