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Table 1 Demographic and treatment characteristics for 818 patients undergoing mastectomy and receiving postmastectomy radiotherapy

From: No difference in dose distribution in organs at risk in postmastectomy radiotherapy with or without breast implant reconstruction

  Total IBR+ IBR-  
Characteristics n = 818 (%) n = 162 (%) n = 656 (%) P- value¶
Age at mastectomy, years     
  Median [min-max] 58 [21-90] 45 [21-69] 58 [21-90] <0.001
  ≤55 363 (44.4) 136 (84.0) 227 (34.6)  
  >55 455 (55.6) 26 (16.0) 429 (65.4) <0.001
Calendar year mastectomy     
  2009 260 (31.8) 61 (37.7) 199 (30.3)  
  2010 292 (35.7) 47 (29.0) 245 (37.4)  
  2011 266 (32.5) 54 (33.3) 212 (32.3) 0.093
Side#     
  Right 391 (47.8) 90 (55.6) 301 (45.9)  
  Left 427 (52.2) 72 (44.4) 355 (54.1) 0.027
Tumor size     
  pT1 309 (37.8) 72 (44.4) 237 (36.1)  
  pT2 333 (40.7) 57 (35.2) 276 (42.1)  
  pT3 125 (15.3) 25 (15.4) 100 (15.2) 0.15
  Missing* 51 (6.2) 8 (4.9) 43 (6.6)  
Lymph nodes     
  pN0 295 (36.1) 83 (51.2) 212 (32.3)  
  pN+ 511 (62.5) 77 (47.5) 434 (66.2) <0.001
  Missing* 12 (1.5) 2 (1.2) 10 (1.5)  
Adjuvant chemotherapy     
  Yes 388 (47.4) 91 (56.2) 297 (45.3)  
  No 415 (50.7) 70 (43.2) 345 (52.6) 0.020
  Missing* 15 (1.8) 1 (0.6) 14 (2.1)  
Neoadjuvant chemotherapy     
  No 559 (68.3) 130 (80.2) 429 (65.4)  
  Yes 259 (31.7) 32 (19.8) 227 (34.6) <0.001
Endocrine therapy     
  Yes 643 (78.6) 110 (67.9) 533 (81.3)  
  No 164 (20.1) 49 (30.2) 115 (17.5) <0.001
  Missing* 11 (1.3) 3 (1.9) 8 (1.2)  
RT target     
  Chest wall 242 (29.6) 80 (49.4) 162 (24.7)  
  Chest wall plus lymph nodes 576 (70.4) 82 (50.6) 494 (75.3) <0.001
Boost dose     
  Yes 27 (3.3) 3 (1.9) 24 (3.7)  
  No 791 (96.7) 159 (98.1) 632 (96.3) 0.33
Bolus field     
  Yes 34 (4.2) 3 (1.9) 31 (4.7)  
  No 784 (95.8) 159 (98.1) 625 (95.3) 0.12
Breast implant     
  Permanent expander 92 (56.8) 92 (56.8) -  
  Permanent implant 40 (24.7) 40 (24.7) -  
  Temporary expander with a magnetic port 30 (18.5) 30 (18.5) - -
  1. IBR indicates immediate breast reconstruction; RT, radiotherapy; pT, tumor size.
  2. *Not included into statistical analysis.
  3. #Including eleven patients with bilateral radiotherapy: IBR + (n = 2) and IBR- (n = 9).
  4. ¶Pearson χ2 test.