- Features of regional nodal irradiation (RNI).
| Survey questions and response(s) | n (%) |
|---|---|
| The following is an indication for RNI after BCS and ALND* | |
| Any N1 | 15 (62.5) |
| Macrometastatic N1 | 14(58.3) |
| N1 with high-risk features | 16 (66.7) |
| N1 with inadequate axillary dissection | 19 (79.2) |
| N1 with extracapsular extension | 18 (75) |
| N2 | 21 (87.5) |
| Any T3N0 | 3 (12.5) |
| T3N0 with high-risk features | 11 (45.8) |
| T2N0 with high-risk features | 4 (16.7) |
| Nx | 10 (41.7) |
| The following is an indication for RNI after MRM* | |
| Any N1 | 13 (54.2) |
| Macrometastatic N1 | 13 (54.2) |
| N1 with high-risk features | 14 (58.3) |
| N1 with inadequate axillary dissection | 18 (75) |
| N1 with extracapsular extension | 17 (70.8) |
| N2 | 21 (87.5) |
| Any T3N0 | 5 (20.8) |
| T3N0 with high-risk features | 15 (62.5) |
| T2N0 with high-risk features | 2 (8.3) |
| Nx | 8 (33.3) |
| The following is an indication for InM LN radiation* | |
| Radiologically positive InM node | 23 (95.8) |
| N1 and medially located tumor | 14 (58.3) |
| N0 and medially located tumor with certain high-risk features | 3 (12.5) |
| When 50% or more of the axilla is positive | 14 (58.3) |
| Whenever RNI is indicated for right-sided tumors only | 1 (4.2) |
| Whenever RNI is indicated | 2 (8.3) |
| The definition of adequate LN dissection is | |
| 8 or more | 3 (12.5) |
| 10 or more | 20 (83.3) |
| 15 or more | 1 (4.2) |
↵* Multiple responses allowed, CTV: clinical target volume, IMRT: intensity modulated radiotherapy, LN: lymph node, RTOG: Radiation Therapy Oncology Group, PTV: planning target volume, ESTRO: European Society for Radiotherapy and Oncology, InM; internal mammary, VMAT: volumetric modulated arc therapy, SC: supraclavicular, ECE: extracapsular extension, T: tumor, N: node