Hello "Newbie2012" and welcome! I only joined this forum after my 3rd surgery for GCT, in late January. I think one thing we have all found is that there is very little information out there about this specific cancer and therefore our collective learning becomes so important to all of us!!
First I am going to insert a paragraph from one of the articles I found from some Italian research:
"Granulosa cell tumours are the most common ovarian sex cord stromal tumours. They secrete steroid hormones and commonly present with symptoms of hyperoestrogenism. Fertility preserving surgery can be performed for stage 1 disease, whereas a total abdominal hysterectomy with removal of both adnexae is recommended for all other patients. Although no studies have been published regarding HRT after treatment for granulosa cell tumours of the ovary, the general belief is that it should not be used as it is endocrinologically active and hormone-dependent disease "
My oncologist did not recommend HRT. I was on it for a while prior to being diagnosed. I am going to take a call now and will write more in a little while.