Core-needle biopsy of breast cancer is associated with a higher rate of distant metastases 5 to 15 years after diagnosis than FNA biopsy

This retrospective cohort study analyzed long-term outcomes in breast cancer patients diagnosed using fine-needle aspiration biopsy (FNAB) in the 1970s versus core-needle biopsy (CNB) in the 1990s. Researchers matched patients on age, tumor size, DNA ploidy, mammography screening status, and treatment protocols. The findings indicated a significantly higher incidence of