Almost 70 Percent of Women with Breast Cancer Are Estrogen-Senstive

Almost 70 percent of women with breast cancer are estrogen-senstive. What does this mean?

A) They are made ill with prescriptions of estrogen.
B) Only a small amount of estrogen can exacerbate their symptoms.
C) Their own natural estrogen encourages the growth of cancer cells.
D) Their cancers go into remission with increased uptake of estrogen.
E) They do not produce their own estrogen.