Table 5 Ipsilateral DCIS recurrence and subsequent invasive carcinoma by primary DCIS disease.

From: Pathological features of 11,337 patients with primary ductal carcinoma in situ (DCIS) and subsequent events: results from the UK Sloane Project

Primary lesion Low Intermediate High Unknown Total p value
Recurrent DCIS grade           
 High-grade DCIS 1 1% 16 11% 109 73% 24 16% 150 <0.001
 Intermediate-grade DCIS 2 3% 20 34% 22 37% 15 25% 59
 Low-grade DCIS 3 19% 3 19% 2 13% 8 50% 16
 Total 6 3% 39 17% 133 59% 47 21% 225
Subsequent invasive grade
 High-grade DCIS 17 8% 83 39% 79 37% 36 17% 215 0.08
 Intermediate-grade DCIS 16 11% 78 53% 35 24% 18 12% 147
 Low-grade DCIS 6 12% 28 57% 6 12% 9 18% 49
 DCIS unknown grade 0 0% 1 50% 1 50% 0 0% 2
 Total 39 9% 190 46% 121 29% 63 15% 413