Patients with a biopsy diagnosis of ductal carcinoma in situ (DCIS) might be diagnosed with invasive breast cancer at excision, a phenomenon known as underestimation. Patients with DCIS are treated based on the risk of underestimation or progression to invasive cancer. The aim of our study was to expand the knowledge on underestimation and to develop a prediction model.
Population-based data were retrieved from the Dutch Pathology Registry and the Netherlands Cancer Registry for DCIS between January 2011 and June 2012.
Of 2892 DCIS biopsies, 21% were underestimated invasive breast cancers. In multivariable analysis, risk factors were high-grade DCIS (odds ratio (OR) 1.43, 95% confidence interval (CI): 1.05–1.95), a palpable tumour (OR 2.22, 95% CI: 1.76–2.81), a BI-RADS (Breast Imaging Reporting and Data System) score 5 (OR 2.36, 95% CI: 1.80–3.09) and a suspected invasive component at biopsy (OR 3.84, 95% CI: 2.69–5.46). The predicted risk for underestimation ranged from 9.5 to 80.2%, with a median of 14.7%. Of the 596 invasive cancers, 39% had unfavourable features.
The risk for an underestimated diagnosis of invasive breast cancer after a biopsy diagnosis of DCIS is considerable. With our prediction model, the individual risk of underestimation can be calculated based on routinely available preoperatively known risk factors (https://www.evidencio.com/models/show/1074).
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The authors thank the Netherlands Comprehensive Cancer Organization and the PALGA foundation for providing a registration database and for their efforts in making the research database for this study.
Study conception: C.J.C.M/P.J.W., study design: C.J.C.M./J.v.R./M.B.E.M.-P./P.J.W., data coding: C.J.C.M./P.J.W., data analyses: C.J.C.M./J.v.R., data interpretation: C.J.C.M./J.v.R./M.B.E.M.-P./B.A.M.t.B./L.d.M./S.S./P.J.W., drafting article: C.J.C.M., revision article: J.v.R./M.B.E.M.-P./B.A.M.t.B./L.d.M./S.S./P.J.W.