From: Assessment of DNA methylation profiling and copy number variation as indications of clonal relationship in ipsilateral and contralateral breast cancers to distinguish recurrent breast cancer from a second primary tumour
Recurrent
De novo
Total
a
 Ipsilateral
11 (69Â %)
5 (31Â %)
16 (100Â %)
 Contralateral
2 (15Â %)
11 (85Â %)
13 (100Â %)
b
6 (38Â %)
10 (62Â %)
1 (8Â %)
12 (92Â %)