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5%, 100%, 100% and 72.4%, respectively, and accuracy of approximately 77.4%. Luminal A subgroup, axillary involvement of less than two positive nodes or nodal tumor of less than 7mm are independent factors of false negative rate. AUS performance would seem to be improved by FNAC, with a false negative rate of approximately 26%. It may be possible to reduce the false negative rate of AUS if its contributing factors are taken into consideration, along with the impact of specific echographic signs as revealed by experienced radiologists.