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Table 2 Performance of surveillance breast MR imaging

From: 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

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 MRIa 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 lesionsb 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
  1. aCancer detection rate for MRI is total number of intramammary and extramammary cancers detected at MR imaging per 1000 examinations
  2. bCancer detection rate for intramammary lesions is total number of total number of intramammary cancers detected at MR imaging per 1000 examinations
  3. cPercentage is shown in parentheses
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