Leveraging the variable natural history of ductal carcinoma in situ (DCIS) to select optimal therapy

Abstract

Purpose: Ductal carcinoma in situ (DCIS) is a non-obligate precursor to invasive ductal carcinoma. The authors sought to discuss the evidence suggesting that not all DCIS will progress to invasive disease if left untreated.

Results: Four lines of evidence align to suggest that not all of this in-situ disease progresses to invasive cancer: its prevalence on screening mammography, studies of missed diagnoses, incidental findings in autopsy specimens, and large retrospective reviews of those treated with excision alone.

Conclusion: A clearer understanding of the variable history of DCIS coupled with advances in genomic profiling of the disease holds the promise of reducing widespread over-treatment of this non-invasive cancer. Additionally, identification of higher risk of recurrence subsets may select patients for whom more aggressive treatment may be appropriate.

Keywords: Breast cancer; Breast cancer genomic profiling; Breast cancer screening; DCIS; Ductal carcinoma in situ; Oncotype DCIS; Oncotype Dx.