question: HI doc my sister had breast cancer 3yrs ago,she had  rt breast mastectomy and chemotherapy.now she is fine and her lab and every thing is good.But She is still taking zoladex LA 10.8 every 3 month,now doctor told her she have to take this med every month or she have to have surgery to remove overy.Is it necessary now.she is 36 yrs with 2 kids.