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Table 1 Correlation between the number of negative lymph nodes removed and clinicopathologic factors

From: Number of negative lymph nodes is associated with disease-free survival in patients with breast cancer

Characteristic   Number of negative lymph nodes Pvalue
   0-10 (n = 607) 11-13 (n = 706) 14-16 (n = 554) 17-40 (n = 588)  
Age       
 <35 234 68 (11.2) 51 (7.2) 51 (9.2) 64 (10.9) 0.054
 ≥35 2221 539 (88.8) 655 (92.8) 503 (90.8) 524 (89.1)  
Menopause       
 Premenopause 1641 402 (66.2) 460 (65.2) 354 (63.9) 425 (72.3) 0.012*
 Postmenopause 814 205 (33.8) 246 (34.8) 200 (36.1) 163 (27.7)  
pT stage       
 T1 812 159 (26.2) 259 (36.7) 190 (34.3) 204 (34.7) <0.001*
 T2 1428 352 (58.0) 398 (53.4) 323 (58.3) 355 (60.4)  
 T3 155 71 (11.7) 41 (5.8) 25 (4.5) 18 (3.1)  
 T4 60 25 (4.1) 8 (1.1) 16 (2.9) 11 (1.8)  
pN stage       
 N0 1263 120 (19.8) 430 (60.9) 342 (61.7) 371 (63.1) <0.001*
 N1 769 185 (30.5) 220 (31.2) 174 (31.4) 190 (32.3)  
 N2 207 115 (18.9) 44 (6.2) 30 (5.4) 18 (3.1)  
 N3 216 187 (30.8) 12 (1.7) 8 (1.5) 9 (1.5)  
ER       
 Negative 953 245 (40.4) 252 (35.7) 219 (39.5) 237 (40.3) 0.304
 Positive 1292 321 (52.9) 384 (54.3) 287 (51.8) 300 (51.0)  
 Unknown 210 41 (6.7) 70 (10.0) 48 (8.7) 51 (8.7)  
PR       
 Negative 824 207 (34.1) 223 (31.5) 198 (35.7) 196 (33.3) 0.398
 Positive 1421 359 (59.1) 413 (58.5) 308 (55.6) 341 (58.0)  
 Unknown 210 41 (6.8) 70 (10.0) 48 (8.7) 51 (8.7)  
Her-2       
 Negative 1377 329 (54.2) 395 (56.0) 307 (55.4) 346 (58.8) 0.460
 Positive 666 168 (27.7) 183 (25.9) 157 (28.3) 158 (26.9)  
 Unknown 412 110 (18.1) 128 (18.1) 90 (16.3) 84 (14.3)  
  1. Data are presented as number (percentage).
  2. ER, estrogen receptor; PR, progesterone receptor; Her-2, human epidermal growth factor receptor-2.
  3. *P < 0.05 indicates a significant difference.