Characteristics of Patients and Tumors at Diagnosis
| Group | |||
| Characteristic | <40 y old | ≥40 y old | P |
| No. of patients | 107 | 107 | |
| Age (y)* | 34.5 ± 4.0 | 56.0 ± 10.7 | |
| AJCC stage before PET/CT | |||
| I | 12 (11) | 12 (11) | |
| IIA | 32 (30) | 32 (30) | |
| IIB | 30 (28) | 30 (28) | |
| III | 33 (31) | 33 (31) | |
| Tumor type | |||
| Invasive ductal | 95 (89) | 86 (80) | 0.13 |
| Invasive lobular | 1 (1) | 9 (8) | 0.02 |
| Other | 11 (10) | 12 (11) | |
| Tumor grade | |||
| 1 | 3 (3) | 10 (9) | 0.08 |
| 2 | 26 (24) | 42 (39) | 0.03 |
| 3 | 78 (73) | 55 (51) | 0.002 |
| Receptor phenotype | |||
| HR+/HER2− | 36 (34) | 53 (50) | 0.03 |
| HER2+ | 35 (33) | 26 (24) | 0.23 |
| TNBC | 35 (33) | 28 (26) | 0.37 |
| Unspecified | 1 (1) | ||
↵* Reported as mean ± SD.
AJCC = American Joint Committee on Cancer.
Data are reported as number (percentage) of patients unless otherwise indicated.