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What is Which of the following is not a risk factor for breast carcinoma? and explain in detail?
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