Breast magnetic resonance imaging for surveillance of women with a personal history of breast cancer: outcomes stratified by interval between definitive surgery and surveillance MR imaging

Table 2 Performance of surveillance breast MR imaging

Performance Statistics	Total (n = 1053)	Initial surgery-MR interval ≤ 36 months (n = 709)	Initial surgery-MR interval > 36 months (n = 344)	p value
Cancer detection rate for MRI^a	6.7 (7/1053)	1.4 (1/709)	17.4 (6/344)	0.006
Abnormal interpretation rate for MRI	84/1053 (8.0%)^c	51/709 (7.2%)	33/344 (9.6%)	0.184
Cancer detection rate for intramammary lesions^b	3.8 (4/1053)	1.41 (1/709)	8.7 (3/344)	0.105
Abnormal interpretation rate for intramammary lesions	76/1053 (7.2%)	49/709 (6.9%)	27/344 (7.8%)	0.612
PPV₁	4/76 (5.3%)	1/49 (2.0%)	3/27 (11.1%)	0.125
PPV₃	3/19 (15.8%)	1/10 (10.0%)	2/9 (22.2%)	0.582
Sensitivity	3/4 (75.0%)	1/1 (100%)	2/3 (66.7%)	> 0.999
Specificity	1031/1049 (98.3%)	698/708 (98.6%)	333/341 (97.6%)	0.199

^aCancer detection rate for MRI is total number of intramammary and extramammary cancers detected at MR imaging per 1000 examinations
^bCancer detection rate for intramammary lesions is total number of total number of intramammary cancers detected at MR imaging per 1000 examinations
^cPercentage is shown in parentheses

ISSN: 1471-2407