Which of the following is not a risk factor for breast carcinoma?
Causes for breast carcinoma are -

Oestrogen exposure, unopposed by progesterone
Nulliparous women
Mutations in the  BRCA1 and BRCA2 genes 
Early menarche/late menopause 
Family history 
Saturated dietary fats
Previous benign atypical hyperplasia
Saturated fatty acids
Early menopause
Nulliparous women
Oestrogen unopposed by progesterone