(P009) Assessment of Lumpectomy Cavity Radiotherapy Boost Volume With Repeat CT Simulation

Lumpectomy cavity (LC) radiotherapy boost after breast conserving surgery and whole breast irradiation (WBRT) reduces local cancer recurrence. Radiotherapy boost correlates with increased rates of fibrosis and may have worse cosmetic outcomes. LC volumes and subsequent boost volumes may decrease with increasing time from surgery. This study evaluates the timing of CT simulation and radiotherapy technique for cavity directed radiotherapy boost. We seek to determine if repeat CT simulation results in smaller boost volumes which may minimize treatment related toxicity and maximize local tumor control.

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