Parameter | Total number (50 cases) | 50Â Gy group (14 cases) | 40.05Â Gy group (36 cases) (36 cases) | p-value |
---|---|---|---|---|
Age, median (range) | 29–77(47) | 29–65(47) | 32–77(47) | 0.754 |
Area of treatment |  |  |  | – |
Breast only | 34 | 4 | 30 | Â |
Supreclavicular area | 12 | 7 | 5 | Â |
Axillary area | 6 | 4 | 2 | Â |
Internal mammary LN | 5 | 5 | 0 | Â |
Laterality | Â | Â | Â | 0.403 |
Left | 36 | 11 | 25 | Â |
Right | 12 | 3 | 9 | Â |
Bilateral | 2 | 0 | 2 | Â |
Histology | Â | Â | Â | 0.065 |
Invasive ductal carcinoma | 38 | 13 | 25 | Â |
Invasive lobular carcinoma | 4 | 1 | 3 | Â |
Mixed | 4 | 0 | 4 | Â |
Carcinoma in situ | 2 | 0 | 2 | Â |
Other | 2 | 0 | 2 | Â |
Estrogen receptor status |  |  |  | – |
Positive | 29 | 6 | 23 | Â |
Negative | 21 | 8 | 13 | Â |
Progesterone receptor status | Â | Â | Â | Â |
Positive | 26 | 5 | 21 | Â |
Negative | 24 | 9 | 15 | Â |
Her2/neu status | Â | Â | Â | Â |
Positive | 8 | 2 | 6 | Â |
Negative | 42 | 12 | 30 | Â |
Histologic grade | Â | Â | Â | 0.065 |
1 | 7 | 1 | 6 | Â |
2 | 20 | 5 | 15 | Â |
3 | 21 | 8 | 13 | Â |
Unknown | 2 | 0 | 2 | Â |
Tumor stage |  |  |  | – |
T1 | 38 | 10 | 28 | Â |
T2 | 11 | 3 | 8 | Â |
T3 | 1 | 1 | 0 | Â |
T4 | 0 | 0 | 0 | Â |
Nodal stage |  |  |  | – |
N0 | 35 | 6 | 29 | Â |
N1 | 14 | 7 | 7 | Â |
N2 | 1 | 1 | 0 | Â |
N3 | 0 | 0 | 0 | Â |
Pathological stage Stage | Â | Â | Â | 0.042 |
I | 26 | 5 | 21 | Â |
II | 22 | 7 | 15 | Â |
III | 2 | 2 | 0 | Â |
Chemotherapy timing | Â | Â | Â | 0.119 |
Adjuvant | 37 | 12 | 25 | Â |
Neoadjuvant | 2 | 1 | 1 | Â |
None(endocrinotherapy) | 11 | 1 | 10 | Â |
Radiation dose |  |  |  | – |
50 Gy | 14 | – | – |  |
40.05 Gy | 36 | – | – |  |