Doing really well but it's never far from the surface

I think I get what you mean @tigerbeth. When people say remission they actually mean partial remission, as defined in your post. Accurately, when we say remission it means the disease is gone, but that's not the broadly understood inference of that word. So, as @AFraser said, it's probably clearer, and more comfortable, if we say NED. I know I prefer it.