Table 1.
Patient and tumor characteristics
| Characteristic | No RT (n) | RT(n) | p |
|---|---|---|---|
| Clinical stage | 0.002 | ||
| IIA | 3 (11) | 1 (1) | |
| IIB | 12 (46) | 12 (15) | |
| IIIA | 4 (15) | 23 (29) | |
| IIIB | 6 (23) | 37 (47) | |
| IIIC | 1 (4) | 6 (8) | |
| Clinical T stage | 0.001 | ||
| T1 | 2 (7) | 0 (0) | |
| T2 | 11 (41) | 11 (14) | |
| T3 | 7 (26) | 29 (36) | |
| T4 | 7 (26) | 40 (50) | |
| Clinical N stage | 0.163 | ||
| N0 | 5 (19) | 9 (11) | |
| N1 | 17 (63) | 37 (46) | |
| N2 | 4 (15) | 28 (35) | |
| N3 | 1 (4) | 6 (8) | |
| Pathologic tumor size (cm) | 0.113 | ||
| 0–2 | 12 (44) | 38 (48) | |
| 2.1–5 | 9 (33) | 28 (35) | |
| ≥5.1 | 1 (4) | 10 (13) | |
| Unknown | 5 (19) | 4 (5) | |
| No. of positive nodes | 0.130 | ||
| 0 | 9 (33) | 19 (24) | |
| 1–3 | 11 (41) | 22 (28) | |
| ≥4 | 6 (22) | 38 (47) | |
| Unknown | 1 (4) | 1 (1) | |
| Percentage of positive nodes | 0.031 | ||
| <20 | 20 (74) | 36 (45) | |
| ≥20 | 7 (26) | 43 (54) | |
| Unknown | 0 (0) | 1 (1) | |
| Nodes sampled (n) | 0.183 | ||
| <10 | 2 (7) | 11 (14) | |
| ≥10 | 23 (85) | 68 (85) | |
| Unknown | 2 (7) | 1 (1) | |
| LVSI | 0.039 | ||
| Present | 9 (33) | 39 (49) | |
| Absent | 18 (67) | 33 (41) | |
| Unknown | 0 (0) | 8 (10) | |
| Tumor grade | 0.798 | ||
| 1 | 12 (44) | 36 (45) | |
| 2 | 9 (33) | 20 (25) | |
| 3 | 5 (19) | 21 (26) | |
| Unknown | 1 (4) | 3 (4) | |
| Margin status | 0.273 | ||
| Free/negative | 26 (96) | 66 (83) | |
| Involved | 0 (0) | 5 (6) | |
| Close (<2 mm) | 0 (0) | 5 (6) | |
| Unknown | 1 (4) | 4 (5) | |
| Estrogen receptor | 0.435 | ||
| Positive | 13 (48) | 32 (40) | |
| Negative | 8 (30) | 36 (45) | |
| Unknown | 6 (22) | 12 (15) | |
| Progesterone receptor | 0.320 | ||
| Positive | 9 (33) | 22 (28) | |
| Negative | 8 (30) | 39 (49) | |
| Unknown | 10 (37) | 19 (24) | |
| Hormonal treatment | 0.227 | ||
| Yes | 6 (22) | 25 (31) | |
| No | 21 (78) | 50 (63) | |
| Unknown | 0 (0) | 5 (6) | |
| Response to neoadjuvant chemotherapy | 0.552 | ||
| CR | 4 (15) | 15 (19) | |
| PR | 22 (81) | 53 (66) | |
| NR | 1 (4) | 2 (3) | |
| PD | 0 (0) | 4 (5) | |
| Unknown | 0 (0) | 6 (7) | |
| Adjuvant chemotherapy | 0.165 | ||
| Yes | 19 (70) | 66 (84) | |
| No | 8 (30) | 13 (16) |
Abbreviations: RT = radiotherapy; LVSI = lymphovascular space invasion; CR = complete response; PR = partial response; NR = no response; PD = progressive disease.
Data in parentheses are percentages.