Table 3.

Diagnostic performance of SNB for axillary staging in AUS-negative patients

			No. of patients
			Permanent histopathology
Intraoperative frozen Histopathology		Total	Metastasis positive	Metastasis negative
A.	Total (n = 124)
	Metastasis positive	24	24	0
	Metastasis negative	100	1	99
	Total	124	25	99
B.	18F-FDG uptake positive (n = 12)
	Metastasis positive	5	5	0
	Metastasis negative	7	1	6
	Total	12	6	6
C.	18F-FDG uptake negative (n = 112)
	Metastasis positive	19	19	0
	Metastasis negative	93	0	93
	Total	112	19	93

Note; SNB, sentinel node biopsy; AUS, axillary ultrasound; No., Number; SNB identification rate 99.2% (124 of 125 cases)

Sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPN), and accuracy overall were 96, 100, 100, 99, and 99%, respectively in A. Sensitivity, specificity, PPV, NPV, and overall accuracy were 83, 100, 100, 86, and 92%, respectively in B.

Sensitivity, specificity, PPV, NPV, and overall accuracy were 100, 100, 100, 100, and 100%, respectively in C.