Just backing up Gam3r01.
If you mean physically lost they're gone until or unless you find the card. It's no different than any other storage media in that if you don't have physical access to it you don't have any access to the data on it.
If you mean malfunctioned, there are some data recovery utilities you can try.
But, again, this is a lesson about backing up. At a very minimum you should be uploading photos off that card to your computer and, one hopes, backing up the computer itself, which gives you three copies.