Table 1.
Patients' baseline characteristics.
| Hypofractionation No. | Conventional fractionation No. | P | |||
|---|---|---|---|---|---|
| Age | ≥ 60 | ≥ 60 | 0.688 | ||
| Mean | 71.9 | 71.6 | |||
| IQR | 9 | 11 | |||
| KPS | 0.742 | ||||
| 100 | 34 | 40% | 26 | 37% | |
| 90 | 51 | 60% | 44 | 63% | |
| T stage | 0.054 | ||||
| 1 | 70 | 82% | 49 | 70% | |
| 2 | 14 | 17% | 21 | 30% | |
| 3 | 1 | 1% | 0 | 0% | |
| N stage | 0.045 | ||||
| 0 | 69 | 83% | 47 | 67% | |
| 1 | 16 | 17% | 23 | 33% | |
| Histologic type | 0.357 | ||||
| Ductal | 66 | 77% | 54 | 77% | |
| Lobular | 13 | 15% | 7 | 10% | |
| Others | 6 | 8% | 9 | 13% | |
| Histologic grade | 0.781 | ||||
| 1 | 17 | 20% | 13 | 18% | |
| 2 | 48 | 56% | 37 | 54% | |
| 3 | 20 | 24% | 20 | 28% | |
| Chemotherapy | 0.375 | ||||
| yes | 19 | 22% | 20 | 29% | |
| no | 66 | 88% | 50 | 71% | |
| Hormone therapy | 0.457 | ||||
| yes | 66 | 78% | 50 | 71% | |
| no | 19 | 22% | 20 | 29% | |
| Breast volume | 0.039 | ||||
| ≥ 500 cc | 24 | 28% | 29 | 41% | |
| < 500 cc | 61 | 72% | 41 | 59% | |
| Breast maximum dose | 0.0009 | ||||
| > 107% ** | 26 | 36% | 40 | 65% | |
| ≤ 107% | 59 | 64% | 30 | 35% | |
| Surgery | 0.584 | ||||
| Quadrantectomy | 84 | 99% | 68 | 97% | |
| Tumorectomy | 1 | 1% | 2 | 7% | |
IQR = interquartile range
KPS = Karnofsky performance status
T = tumor
N = lymph-node
** > 53.5 Gy for conventional fractionation and > 48.1 Gy for hypofractionation
P = chi-square test or Fisher's exact test