Is it acceptable to omit post-lumpectomy radiation in an elderly patient with recurrent, ipsilateral breast cancer but low risk features?

In terms of omitting post-lumpectomy radiation, its about assessing risk. If this is a recurrence in the same area or proximity ("true recurrence"), I would consider RT in light of recurrence particularly if time from original diagnosis was short.

If this was a recurrence in another quadrant or dist...