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Table 1 Baseline characteristics and treatment patterns for IMPC and IDC

From: Invasive micropapillary carcinoma of the breast had poor clinical characteristics but showed no difference in prognosis compared with invasive ductal carcinoma

  IMPC (n = 33) IDC (n = 347) P*
Age (year)   0.885
 ≤45 11 (33.3 %) 120 (34.6 %)  
 >45 22 (66.7 %) 227 (65.4 %)  
Family history   0.179
 Yes 2 (6.1 %) 7 (2.0 %)  
 No 17 (21.5 %) 340 (98.0 %)  
ER status   0.011
 Positive 27 (81.8 %) 206 (59.4 %)  
 Negative 6 (18.2 %) 141 (40.6 %)  
PR status   0.123
 Positive 25 (75.8 %) 209 (62.6 %)  
 Negative 8 (24.2 %) 125 (37.4 %)  
Her2 status   0.479
 Positive 6 (18.8 %) 82 (24.3 %)  
 Negative 26 (81.2 %) 255 (75.7 %)  
 Unknown 1 10  
Subtype    0.006
 Luminal 29 (87.9 %) 223 (64.3 %)  
 Non-luminal 4 (12.1 %) 124 (35.7 %)  
T classification   0.044
 T1–T2 25 (75.8 %) 309 (89.0 %)  
 T3–T4 8 (24.2 %) 38 (11.0 %)  
N classification   <0.001
 N0 7 (21.2 %) 186 (53.8 %)  
 N1–N3 26 (78.2 %) 160 (46.2 %)  
 Unknown 0 1  
Staging   <0.001
 I–II 15 (45.5 %) 262 (76.2 %)  
 III 18 (54.5 %) 82 (23.8 %)  
 Unknown 0 3  
Operation methods    0.392
 BCS 0 (0 %) 19 (5.5 %)  
 Mastectomy 33 (100 %) 328 (94.5 %)  
Adjuvant chemotherapy    0.709
 Yes 32 (97 %) 321 (93.3 %)  
 No 1 (3.0 %) 23 (6.7 %)  
 Unknown 0 3  
Radiotherapy    0.146
 Yes 14 (42.4 %) 104 (30.1 %)  
 No 19 (57.6 %) 241 (69.9 %)  
 Unknown 0 2  
Hormone therapy    0.026
 Yes 28 (84.8 %) 227 (65.8 %)  
 No 5 (15.2 %) 118 (34.2 %)  
 Unknown 0 2  
Neoadjuvant chemotherapy    0.128
 Yes 4 (12.1 %) 19 (5.5 %)  
 No 29 (87.9 %) 328 (94.5 %)  
Trastuzumab    0.754
 Yes 2 (6.1 %) 33 (9.5 %)  
 No 31 (93.9 %) 314 (90.5 %)  
Lymphovascular invasion    <0.001
 Yes 6 (18.2 %) 2 (0.6 %)  
 No 27 (81.8 %) 345 (99.4 %)  
Nerve invasion    0.007
 Yes 2 (6.1 %) 0 (0 %)  
 No 3193.9 %) 347 (100 %)  
  1. IMPC invasive micropapillary carcinoma, IDC invasive ductal carcinoma, ER estrogen receptor, PR progesterone receptor
  2. * All P values calculated by two-sided x2 test