This multicenter study aims to evaluate whether active breast ultrasound screening can improve the early diagnosis rate of breast cancer in women aged 65 to 80 years, compared with routine elderly health management. The study uses a mixed cluster-individual randomized design based on community implementation capacity. A subgroup of pilot communities will simultaneously collect ultrasound AI data for research performance analysis only, without affecting clinical diagnosis.
None
History of breast cancer Breast screening within past 2 years Severe comorbid conditions affecting survival Acute breast infection Cognitive impairment affecting participation
Parallel
Standardized Breast Ultrasound Screening
Procedure/SurgeryRetrospective AI image analysis for research use only, not involved in clinical decision-making.
Absolute difference in early-stage breast cancer diagnosis rate
Proportion of pathologically confirmed breast cancer cases at stage I or stage II, compared between the ultrasound screening group and the routine management group within 2-year follow-up.
Overall breast cancer detection rate
Overall breast cancer detection rate
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