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Relationship between breast cancer histology and onset of menstruation. Early menarche is an increased risk factor.
| Menarche | Invasive ductal carcinoma | Invasive lobular carcinoma | In situ carcinoma | Benign masses |
|---|---|---|---|---|
| 10–14 | 12 | 2 | 1 | 108 |
| 15 | 3 | 1 | 0 | 30 |
| 16–20 | 3 | 1 | 0 | 33 |
|
| ||||
| Totals | 18 | 4 | 1 | 171 |
