Thanks Dinah for your information. I am wondering if it is sensible for me (despite not having any symptoms)to ask my oncologist to perform bonescan and tests you mentioned. I am lucky to have a very considerate oncologist who always listens to patients' concern. Last time when I told him about blood in the mucus, he immediately arranged a chest X-ray for me and when I talked about thyroid problem, he immediately had a blood test for me. I am on a bi-montly medical check up now and each time I have blood test for tumor marker.I don't know how useful this is to detect cance cells. Would like to hear advice from anyone here.