Table 1

Pathological features of screen-detected and true interval cancers

Pathological dataScreen-detected invasive cancersTrue interval cancersP
Total no. of cases 1358451
Graden = 84n = 50a
 140 (48%)5 (10%)
 238 (45%)24 (48%)P < 0.001
 36 (7%)21 (42%)
Sizen = 82bn = 49c
 Mean17.7 mm20.5 mm
 Smaller than mean55 (67%)29 (59%)P < 0.01
 Larger than mean27 (33%)20 (41%)
 <10 mm21 (26%)5 (10%)
 10 mm–15 mm23 (28%)11 (22%)P < 0.05
 15 mm–20 mm22 (27%)13 (27%)
 >20 mm16 (19%)20 (41%)
Node statusn = 44n = 29
 Negative26 (59.1%)14 (48.3%)
 Positive18 (40.9%)15 (51.7%)
  • a One true interval cancer was a ductal carcinoma in situ and was not analyzed further.

  • b The sizes of two screen-detected invasive cancers could not be determined because they were multifocal.

  • c The size of one true interval cancer could not be determined because it was multifocal.