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Table 1 Patients (N = 100) and primary tumor (N = 101) characteristics

From: Intradermal microbubbles and contrast-enhanced ultrasound (CEUS) is a feasible approach for sentinel lymph node identification in early-stage breast cancer

Baseline characteristics Number of patients (N = 100) or cases (N = 101) (%)
Patient characteristics  
 Menopause status  
  Premenopausal 39 (39 %)
  Post-menopause 61 (61 %)
 BMI  
  <19 3 (3)
  19–25 59 (59 %)
  ≥25 38 (38 %)
Tumor characteristics  
 Orientation  
  Upper outer quadrant 46 (45.5 %)
  Upper inner quadrant 27 (26.7 %)
  Lower outer quadrant 10 (9.9 %)
  Lower inner quadrant 9 (8.9 %)
  Central quadrant 9 (8.9 %)
 Tumor size  
  Tis 4 (4.0 %)
  T1 77 (76.2 %)
  T2 20 (19.8 %)
 Histology  
  DCIS 4 (4.0 %)
  Invasive ductal 81 (80.2 %)
  Invasive lobular 8 (7.9 %)
  Others 8 (7.9 %)
 Stagea  
  0 4 (4.0 %)
  I 49 (48.5 %)
  II 35 (34.7)
  III 13 (12.9 %)
 Molecular subtype [35]  
  Luminal A 26 (25.7 %)
  Luminal B 53 (52.5 %)
  Her-2 positive 4 (4.0 %)
  Triple negative 18 (17.8 %)
  1. DCIS ductal carcinoma in situ
  2. aAccording to the American Joint Committee on Cancer (AJCC) TNM staging system for breast cancer, 7th edition