A VUS in exon 4 of CHEK2 (rs77130927, c.C538T:p.R180C), which we have previously shown to have a borderline association with invasive lobular cancer (ILC) (P = 0.03, Petridis et al, accepted Cancer Epidemiology, Biomarkers & Prevention), was found in two DCIS cases and one control. This evidence concerns the gene CHEK2 and ductal breast carcinoma in situ.