Five-Year Breast Cancer Risk Prediction From Screening Breast Ultrasound Using Deep Learning
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Objective
To develop and evaluate a deep learning model for five-year breast cancer risk prediction from screening breast ultrasound (BUS) examinations.
Methods
This retrospective study included 295,298 breast ultrasound examinations from 122,072 women imaged between 2012 and 2020. Patients were split into training, validation, and test sets; the test set included screening examinations only. BUS-Risk-Net aggregated image features using attention-based multiple instance learning and combined them with age and ultrasound-estimated breast density to predict 2- to 5-year risk. Performance was compared with the full Tyrer–Cuzick model in a matched case-control cohort and with a reduced Tyrer–Cuzick model in the held-out test set. Risk stratification was evaluated within BI-RADS density categories.
Results
In the matched case-control cohort (n = 240 women), BUS-Risk-Net achieved a 5-year AUC of 0.632 (95% CI, 0.562–0.702), versus 0.514 for the full Tyrer–Cuzick model (95% CI, 0.440–0.588; p = 0.04). Among 19,548 examinations from 9,015 women eligible for 5-year evaluation in the test set, BUS-Risk-Net achieved an AUC of 0.679 (95% CI, 0.653–0.706), versus 0.594 for the reduced Tyrer–Cuzick model (95% CI, 0.564–0.623; P < .001). Observed 5-year cancer incidence increased across AI-defined risk tiers within each BI-RADS density category, ranging from 0.0% to 5.8% after AI stratification, compared with 2.1% to 3.6% across density categories alone.
Discussion
Deep learning models applied to screening breast ultrasound could enable long-term breast cancer risk prediction and stratify risk beyond breast density alone. External and prospective validation is needed before clinical use.
Summary Sentence
BUS-Risk-Net enabled long-term breast cancer risk prediction from screening ultrasound, outperformed the Tyrer–Cuzick–based comparators, and identified distinct 5-year risk groups with differing observed cancer incidence within each breast density category.
