Table 2.

Characteristics of breast cancers by type of atypiaa

ADH (N = 60)ALH (N = 75)aP valueb
Breast cancer sidedness0.79
 Missing24
 Bilateral3 (5.2%)2 (2.8%)
 Ipsilateral37 (63.8%)46 (64.8%)
 Contralateral18 (31.0%)23 (32.4%)
Cancer type0.07
 Missing16
 Invasive44 (74.6%)60 (87.0%)
In situ15 (25.4%)9 (13.0%)
Invasive histology grouping0.14
 Missing16
 Ductal46 (78.0%)53 (76.8%)
 Lobular5 (8.5%)12 (17.4%)
 Other8 (13.6%)4 (5.8%)
Tumor grade0.46
 Missing1826
 Grade 113 (31.0%)15 (30.6%)
 Grade 218 (42.9%)26 (53.1%)
 Grade 311 (26.2%)8 (16.3%)
Time from benign biopsy to breast cancer0.22
 ≤5 y24 (40.0%)23 (30.7%)
 6–10 y19 (31.7%)18 (24.0%)
 11–15 y10 (16.7%)17 (22.7%)
 >15 y7 (11.7%)17 (22.7%)
Nodal status (invasive cancers only)0.30
 Missing54
 Negative27 (69.2%)44 (78.6%)
 Positive12 (30.8%)12 (21.4%)
Tumor size (cm) (invasive cancers only)0·46
N4157
 Mean (SD)1.6 (1.1)1.9 (1.9)
  • aSeven cases with concomitant ADH and ALH excluded from table, and one with atypia type unspecified.

  • bP values calculated using χ2 tests for categorical variables and t tests for continuous variables.