Table 2.
Adjuvant Treatments by Drainage Patterna
| Characteristic | Total n =1772 | IM Drainage n = 334 | No IM Drainage n = 1438 | P Value |
|---|---|---|---|---|
| Chemotherapy | 0.8 | |||
| Yes | 727 (41.0) | 139 (41.6) | 588 (40.9) | |
| No | 1045 (59.0) | 195 (58.4) | 850 (59.1) | |
| Endocrine therapy | .07 | |||
| Yes | 1255 (70.8) | 223 (66.8) | 1032 (71.8) | |
| No | 517 (29.2) | 111 (33.2) | 406 (28.2) | |
| XRT | 0.2 | |||
| Yes | 1167 (65.9) | 210 (62.9) | 957 (66.6) | |
| No | 605 (34.1) | 124 (37.1) | 481 (33.4) | |
| IM XRT | 0.9b | |||
| Yes | 69 (3.9) | 13 (3.9) | 56 (3.9) | |
| No | 1387 (78.3) | 255 (76.3) | 1132 (78.7) | |
| Unknown | 315 (17.8) | 66 (19.8) | 250 (17.4) | |
| Patients with positive SLNs | n = 405 | n = 69 | n = 336 | |
| IM XRT | 0.5b | |||
| Yes | 50 (12.4) | 10 (14.5) | 40 (11.9) | |
| No | 288 (71.1) | 46 (66.7) | 242 (72.0) | |
| Unknown | 67 (16.5) | 13 (18.8) | 54 (16.1) |
IM indicates internal mammary; SLN, sentinel lymph node; XRT, external beam radiation therapy.
a
Data are number of patients (%).
b
P value calculated after excluding “unknown” category.