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Table 3 A comparison between the LR+RT+ and LR-RT+/LR-RT- subgroups

From: Gene expression profiling in primary breast cancer distinguishes patients developing local recurrence after breast-conservation surgery, with or without postoperative radiotherapy

Factor LR+RT+ LR-RT+/LR-RT- P value
ER status, number    
   Negative 10 11  
   Positive 9 69 0.0007a
Median age, years    
   All 48 61 0.00004b
   ER- subgroup 49.5 53 0.12
   ER+ subgroup 46 61 0.002
Histological grade, number    
   1 3 35  
   2 8 22  
   3 7 18 0.055a
Median tumor size, millimeters 15 15 0.95b
  1. Only cases from inclusion 1 are included. aFisher exact test. bWilcoxon rank sum test. ER = estrogen receptor; LR-RT- = no local recurrence, no radiotherapy given; LR-RT+ = no local recurrence after radiotherapy; LR+RT+ = local recurrence developed after radiotherapy.