Grades of 164 Invasive Ductal Carcinomas Studied Using Grading System of Bloom and Richardson by Age and Size of Tumor
| Bloom–Richardson grade of invasive ductal cancer | No. of lesions | Mean age ± SD of patients (y) | Mean size ± SD of lesion (mm) |
|---|---|---|---|
| Grade 1 | 23 | 56 ± 9.1 | 17.4 ± 7.9 |
| Grade 2 | 77 | 52.6 ± 9.8 | 29.9 ± 20.8 |
| Grade 3 | 64 | 50.9 ± 13.3 | 38.5 ± 23.6 |
Bloom and Richardson (20).