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Table 4 A comparison between the LR+RT- and 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- P value
ER status, number    
   Negative 8 6  
   Positive 14 27 0.21a
Median age, years    
   All 53 61 0.02b
   ER- subgroup 59.5 54 0.90
   ER+ subgroup 50.5 62 0.02
Histological grade, number    
   1 4 13  
   2 10 9  
   3 5 8 0.19a
Median tumor size, millimeters 15 14 0.67b
  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- = local recurrence developed, no radiotherapy given.