Hi BronS - travel insurance sure is a source of frustration with metastatic breast cancer. It is so unfair when most of us are quite fit and active - and wanting to travel while we are well. I'm thinking about an overseas trip, and have been googling travel insurance companies - it was looking impossible to find cover if your cancer has spread beyond the primary site. However I did come across one company called AllClear Travel Insurance Australia. It says it specialises in cover for pre-existing medical conditions (the website says "any condition, any age"). I assume it would be very expensive - but it may be worth checking with them? Good luck - please let us know if you have any success.