| Variables | Number (n) | Frequency (%) |
| Age (years) at chemotherapy onset | ||
| <30 | 28 | 10.6 |
| 30 - 39 | 126 | 47.5 |
| ≥40 | 111 | 41.9 |
| Parity |
|
|
| Nulliparous | 27 | 10.2 |
| Pauciparous | 181 | 68.3 |
| Multiparous | 57 | 21.5 |
| Menstrual cycle |
|
|
| Regular | 237 | 89.4 |
| Irregular | 28 | 10.6 |
| Histological types | ||
| Ductal carcinoma | 240 | 90.6 |
| Lobular carcinoma | 18 | 6.8 |
| Sarcoma | 3 | 1.1 |
| Paget’s disease | 1 | 0.4 |
| Papillar carcinoma | 1 | 0.4 |
| Mixte carcinoma | 2 | 0.8 |
| Clinical stage of the disease | ||
| T1 | 18 | 6.8 |
| T2 | 30 | 11.3 |
| T3 | 91 | 34.3 |
| T4 | 104 | 39.2 |
| TX | 22 | 8.3 |