Screening MRI in Women With a Personal History of Breast Cancer.

BACKGROUND

Screening MRI is recommended for individuals at high risk for breast cancer, based on genetic risk or family history (GFH); however, there is insufficient evidence to support screening MRI for women with a personal history (PH) of breast cancer. We compared screening MRI performance in women with PH vs GFH of breast cancer.

METHODS

We analyzed case-series registry data, collected at time of MRI and at 12-month follow-up, from our regional Clinical Oncology Data Integration project. MRI performance was compared in women with PH with those with GFH. Chi-square testing was used to identify associations between age, prior history of MRI, and clinical indication with MRI performance; logistic regression was used to determine the combined contribution of these variables in predicting risk of a false-positive exam. All statistical tests were two-sided.

RESULTS

Of 1521 women who underwent screening MRI from July 2004 to November 2011, 915 had PH and 606 had GFH of breast cancer. Overall, MRI sensitivity was 79.4% for all cancers and 88.5% for invasive cancers. False-positive exams were lower in the PH vs GFH groups (12.3% vs 21.6%, P < .001), specificity was higher (94.0% vs 86.0%, P < .001), and sensitivity and cancer detection rate were not statistically different (P > .99). Age (P < .001), prior MRI (P < .001), and clinical indication (P < .001) were individually associated with initial false-positive rate; age and prior MRI remained statistically significant in multivariable modeling (P = .001 and P < .001, respectively).

CONCLUSION

MRI performance is superior in women with PH compared with women with GFH. Screening MRI warrants consideration as an adjunct to mammography in women with a PH of breast cancer.