Table 1.
Patient and treatment characteristics
| Characteristic | Left breast | Right breast |
|---|---|---|
| Number of patients | 31 | 27 |
| Median age (y) [range] | 58 [38–85] | 51 [31–80] |
| Body mass index (kg/m2) | ||
| Median (range) | 26.9 | 29.1 |
| 18.5–25 (normal) | 10 | 6 |
| >25–30 (overweight) | 11 | 8 |
| >30 (obese) | 10 | 13 |
| Stage | ||
| 0 | 6 | 2 |
| 1 | 10 | 14 |
| 2 | 13 | 10 |
| 3 | 2 | 1 |
| Median dose (Gy) | 50 | 50 |
| Median number of fractions | 25 | 25 |
| No. of fields | ||
| 2‐field | 17 | 11 |
| 3‐field | 14 | 16 |
| Dosimetric metrics | ||
| Mean heart dose (Gy) in DIBH plan | 1.7 | – |
| Mean heart dose (Gy) in FB plan | 4.8 | – |
| Ipsilateral lung V20Gy (%) in DIBH plan | 21.2% | 21.5% |
| Ipsilateral lung V20Gy (%) in FB plan | 26.3% | 28.6% |
| Immobilization device | ||
| Custom only | 8 | 8 |
| CDR Sabella breastboard + custom | 23 | 19 |
| Neoadjuvant chemotherapy | ||
| Yes | 13 | 13 |
| No | 18 | 14 |
| Cardiotoxic chemotherapy | ||
| Herceptin use | 5 | 2 |
| Adriamycin use | 9 | 12 |
| IMN disease | 4 | 9 |