Hi David,

From what I can gather this is unusual but not unknown.Usually the origin can be identified from the microscopic examination of the cancer cells as each has a different shape and size, but not always.

The important thing is that the chemo is working for you :-)

Cheers
Dave

I've had the same looking to start chemo in a week but in meantime have had my notes sent for 2nd opinion to 3 hospitals my oncologist at our local hospital agreed.  I didn't realise you could get more than one opinion.  Sent on Monday this week and I have bugged one of the hospitals already and I believe I will get a phone call tomorrow but I also have the number of the secretary to bug.  I have also asked for all my medical notes incase I want in the future to see someone privately.  

Hi Dave, I was diagnosed with cancer of an unknown primary ( CUP)in January 2015. I'm on my fifth round of six chemo's for a 6cm pelvic tumor and a small tumour in my hip bone. After three lots of chemo my scan showed the tumour had reduced in size now 3.7 cm. There is a test you can have although the NHS support the test they do not fund the cost. If you google LAB 21 you will see they can carry out further test on any biopsy that you have already had and there is a 85% chance they will find where the primary came from. Mine came back 90% lung, when this was discussed with my oncologist she did say that the treatment I am on would have been no different had they had known. We had this test done for our own piece of mind and knowing I'm on the right treatment has eliminated one area of worry. I know this is a very dark time and you feel almost helpless however if the chemo is doing the job it maybe like me you are on the right treatment.. My thoughts and prayers are with you. Michele