Trial drug - Fulvestrant AZD5363

Hello everyone..my daughter has developed secondary breast cancer in liver and spine and has been offered a trial drug called Fulvestrant AZD5363.  It is only a few days after scan results and she is not sure what to do.  Is there anybody out there who is taking this drug.  If so, it would be so helpful to hear from you.  Lots of hugs to all you amazing ladies. Xxxx