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Table 2 Univariate comparison of clinical variables among patients with good prognosis and poor prognosis

From: Gene expression profiling spares early breast cancer patients from adjuvant therapy: derived and validated in two population-based cohorts

  Alive (n = 121) Deceased (n = 38) P value
Proportion of patients with poor prognosis score (%) 0.34 0.74 <0.0001
Mean age at breast cancer diagnosis (years) 57.5 (±12.4) 58.8 (±16.8) 0.59
Mean tumor size (mm) 21.3 (±11.5) 25.6 (±12.6) 0.05
Proportion of patients with tumor size <21 mm (%) 0.65 0.47 0.06
Proportion of patients with positive lymph nodes (%) 0.37 0.39 0.71
Proportion of patients with grade I (%) 0.23 0.08 0.06a
Proportion of patients with grade II (%) 0.41 0.36  
Proportion of patients with grade III (%) 0.36 0.56  
Proportion of patients with estrogen-receptor-positive tumors (%) 0.83 0.79 0.61
Proportion of patients with progesterone-receptor-positive tumors (%) 0.77 0.55 0.01
Proportion of patients receiving chemotherapy (%) 0.18 0.21 0.69
Proportion of patients receiving endocrine therapy (%) 0.76 0.58 0.03
Proportion of patients receiving radiotherapy (%) 0.51 0.39 0.21
  1. Continuous variables compared using t tests; proportions compared using chi-squared tests.
  2. aCombined testing using the chi-squared test.