Hi and a very warm welcome to the online community
Unfortunately, as you have found, it can be more difficult to find travel insurance when you have had a cancer diagnosis.
I'm not medically trained but I would imagine that they are classing your CUP (cancer of unknown primary) as metastatic because, as you know, CUP is cancer that has spread but it's not known from where in the body it has spread from and metastatic cancer means cancer that has spread to a different part of the body from where it started.
I don't know whether you've looked through the Recommended Travel Insurance thread yet as it's where we try to keep recommendations from other forum members who have obtained travel insurance. Clicking on the link I've created will take you directly to it if you haven't seen it.
It is best to phone the travel companies rather than try and do online quotes. Make sure you have all the information to hand about your husband's diagnosis and treatment before contacting the insurers. This is a list of common questions that insurers might ask when you're applying for insurance.
Some insurers will ask for a letter from your doctor to prove that they have given you permission to travel. In any case it's always best to make sure that you have checked with your doctor that it's okay to travel and that this has been recorded in your notes in case of a claim.
I do hope that you can get travel insurance and please let us know how you get on.
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