Following are risk factors for Ca breast except :
a) Maternal Grand mother had history
b) Paternal grand mother had history
c) Long term estrogen
d) Fat necrosis
Family history of even 2nd degree relatives is associated with increased risk, although much less than that with 1Stdegree relatives.
Administration of estrogens alone is not associated with increased risk of breast cancer
Concamitant administration of progesterone and estrogen increase the risk of breast cancer. [Harrison 17/e p.563; Sabiston 18/e p864]