ESTRO 2024 - Abstract Book

S1160

Clinical - Haematology

ESTRO 2024

left and right breasts individually, and 21 to the combined breast volume. V5Gy (%) was reported 6, 11 and 11 times for combined, left and right breasts, whilst V10Gy was reported 4, 3 and 3 times for the combined, left and right breasts respectively.

Breast contouring techniques or guidelines were seldom reported (9/57 papers).

The target contouring technique was reported by all but 2 papers. MBD both (calc) (%pres) was significantly greater for IFRT than ISRT (p<0.01). For MBD both (calc) (%pres), V5Gy both (calc) (%) and V10Gy both (calc) (%), INRT was not significantly lower than ISRT. Irradiation of both the mediastinum and axilla significantly increased MBD both (calc) (Gy), compared to irradiating the mediastinum alone (Figure 2). This was also seen for MBD both (calc) (%pres), V5Gy both (calc) (%) and V10Gy both (calc) (%) (p<0.01 for all). When considering the RT technique, the mean value for proton beam therapy (PBT) was greater than that for butterfly volumetric arc therapy (BVMAT) at V10Gy both (calc) (%), but the PBT mean value was lower than BVMAT for V5Gy both (calc) (%) and MBD both (calc) (Gy and %pres), but none of these differences were significant. At V5Gy both (calc) (%), 3DCRT was significantly lower (p= 0.01) than IMRT. Due to limited reporting in the papers examined, conclusions were difficult to draw for the effect of the patient’s arm positioning and position on the table on the breast dose metrics.