- Features of hypofractionation regimens.
| Survey questions and response(s) | n (%) |
|---|---|
| The following is a reason not to hypofractionate* | |
| Nodal irradiation, with or without InM radiation | 4 (16.7) |
| DCIS | 3 (12.5) |
| Postmastectomy | 2 (8.3) |
| InM radiation | 6 (25) |
| Immediate reconstruction | 11 (45.8) |
| Skin involvement | 3 (12.5) |
| None | 6 (25) |
| Other | 2 (8.3) |
| Dose (Gy/F) | |
| 42.4/16 | 5 (20.8) |
| 40/15 | 18 (75) |
| Other | 1 (4.2) |
| Boost dose (Gy/F) | |
| 2.00 | 12 (50) |
| 2.5 | 12 (50) |
| Organs at risk constraints | |
| I use the exact same constraints as conventional fractionation | 13 (54.2) |
| I change the dose parameters based on the EQD2 calculation | 6 (25) |
| I follow a certain institutional or trial protocol | 5 (20.8) |
↵* Multiple responses allowed. InM: internal mammary, DCIS: ductal carcinoma in situ, EQD2: equivalent dose in 2 Gy fraction