Efficacy and Safety of 500mg of Fulvestrant

Fulvestrant will be administered by intramuscular injection on day 1, day 15 and day 29 and then every 28 days thereafter.
Participants will have a physical examination and blood work performed on each treatment date. After teh study treatment has been completed, the physical examinations will be done every three months for the first 2 years, every 6 months for years 2-5, and annually after 5 years.
Participants may remain on study treatment until disease progression or until they experience serious side effects.