Hi there,
My husband was diagnosed with neuroendocrine cancer back in Oct 2005 and the doctors were not able to determine the primary site either, even after several different types of tests. It was 4 or 5 days after we were told he had cancer that they came back and said they could not determine the site of origin, and probably never would be able to. Of course by the time my husband was diagnosed he had a massive tumor in his abdominal area with metastases to his liver and some lesions on his bones. We were told right away that neither surgery nor radiation would ever be an option for him
It is very frustrating in this day and age to not be able to find out where it all started, what with all the technology we have. As a result he has been treated with all different types of chemo to try and see which will be most effective. Fortunately he has remained "stable" since his original diagnosis and we remain hopeful that one of these treatments will help him feel better. There are so many different drugs and alternative treatments out there, so tell your friend to hang in there - hopefully she will respond well to the treatment she is receiving, and if not there is always something else they can try.
Take care, and best wishes to you both.
Jodi