Table 1.
Patient and treatment characteristics
| Variable | CF-PMRT n (%) N = 660 |
HF-PMRT n (%) N = 980 |
p-value |
|---|---|---|---|
| Age (Median; IQR) (year) | 57 (49–64) | 51 (45–58) | < 0.001* |
| Tumor side | 0.011 | ||
| Left side | 324 (49) | 492 (50) | |
| Right side | 323 (49) | 484 (49) | |
| Both sides | 13 (2) | 4 (1) | |
| AJCC stage | < 0.001 | ||
| I | 32 (5) | 54 (6) | |
| II | 329 (50) | 559 (57) | |
| III | 250 (38) | 323 (33) | |
| IV | 14 (2) | 44 (4) | |
| Unknown | 35 (5) | 0 (0) | |
| Chemotherapy | 0.027 | ||
| No | 23 (3) | 58 (6) | |
| Yes | 637 (97) | 922 (94) | |
| Hormonal therapy | 0.257 | ||
| No | 248 (38) | 397 (41) | |
| Yes | 412 (62) | 583 (59) | |
| Radiotherapy technique | 0.001 | ||
| 2D technique with bolus | 660 (100) | 967 (99) | |
| Tomotherapy | – | 13 (1) | |
| Radiotherapy technique | < 0.001 | ||
| CW only | 20 (3) | 90 (9) | |
| CW plus RNI | |||
| - CW + SPC | 453 (69) | 595 (61) | |
| - CW + SPC+ Axillary | 187 (28) | 295 (30) | |
| Radiotherapy boost | < 0.001 | ||
| No | 554 (84) | 731 (75) | |
| Yes | 106 (16) | 249 (25) | |
CF-PMRT Conventional fractionated post mastectomy radiotherapy, HF-PMRT Hypofractionated post mastectomy radiotherapy, N number, IQR Inter Quartile Range, AJCC American Joint Committee on Cancer, CW chest wall, SPC supraclavicular, RNI regional nodal irradiation
p-value for Fisher’s exact except for *Wilcoxon rank-sum (Mann-Whitney)