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Table 4 Distribution of different DCIS grades by year and screening status

From: The distribution of ductal carcinoma in situ (DCIS) grade in 4232 women and its impact on overdiagnosis in breast cancer screening

   Detected at mass screening Screen negative P value
   N % N %  
Year       
2007   410   19   
  Low-grade DCIS 59 14.4 % 3 15.8 %  
  Intermediate-grade DCIS 109 26.6 % 2 10.5 % 0.083
  High-grade DCIS 242 59.0 % 14 73.7 %  
2008   525   58   
  Low-grade DCIS 91 17.3 % 11 19.0 %  
  Intermediate-grade DCIS 167 31.8 % 15 25.9 % 0.827
  High-grade DCIS 267 50.9 % 32 55.2 %  
2009   495   186   
  Low-grade DCIS 84 17.0 % 35 18.8 %  
  Intermediate-grade DCIS 176 35.6 % 56 30.1 % 0.651
  High-grade DCIS 235 47.5 % 95 51.1 %  
  1. The P values indicate the significance of the difference of these distributions between screening status. Low-grade DCIS: DCIS with a low malignant potential. Intermediate-grade DCIS: DCIS with an intermediate malignant potential. High-grade DCIS: DCIS with a high malignant potential
  2. DCIS ductal carcinoma in situ
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