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Yah I think that sounds reasonable ?
But, I would argue, is it necessary in the setting of such good outcomes already without large evidence of marginal recurrences (meaning we're just barely missing and need the beam to be more accurate) or excessive toxicity (meaning we'd really stand to benefit from aggressive shrinkage of PTV like in lung cancer). This is the downside of early stage breast - patients do so well (and so many of them will do well even without the RT) that identifying incremental approaches in improving accuracy lead to (IMO) relevant questions of whether it's worth the extra cost.