Performance of screening MRI in high risk patients at initial versus subsequent screen

Area of Science:

• Radiology and Imaging Science
• Oncology and Cancer Research
• Women's Health

Background:

• Breast MRI screening is a crucial tool for early cancer detection in high-risk women.
• Understanding performance differences between initial and subsequent screening MRIs is vital for patient counseling and optimizing screening protocols.

Purpose of the Study:

• To compare the diagnostic performance and outcomes of initial versus subsequent breast MRI screenings.
• To evaluate key metrics including interpretation rates, biopsy rates, and cancer detection rates.

Main Methods:

• Retrospective analysis of screening MRIs from 2013-2015 at an academic practice.
• Categorization into initial screens and subsequent screens (with prior MRI comparison).
• Statistical comparison using Binomial and Fisher's exact tests.

Main Results:

• Initial screens showed significantly higher abnormal interpretation (52% vs. 19%) and biopsy rates (49% vs. 15%) than subsequent screens.
• Cancer detection rate was higher in initial screens (85/1000) compared to subsequent screens (29/1000).
• Higher sensitivity (100% vs. 88%) but lower specificity (55% vs. 83%) observed in initial screens.

Conclusions:

• Higher abnormal rates in initial breast MRI screening reflect prevalence screening and lead to significantly higher cancer detection.
• Patients and providers should be aware of the higher likelihood of recall but also the increased cancer detection benefit of initial screening MRIs.
• Availability of prior MRIs is crucial for improving specificity and reducing false positives in subsequent screening.