`` Cancer of unknown primary , '' or CUP , is a mystery disease . At first , the Symons were hopeful : `` We kept thinking it 's only a matter of time before someone figures out where this comes from and are able to treat it , that we 'd have good news and that while she might not be cured , she would be able to live with the cancer . '' It's not known why it occurs in some people and not others. CUP Foundation casts light on the challenging diagnosis .
`` Cancer of unknown primary , '' or CUP , is a mystery disease . It's not known why it occurs in some people and not others. CUP Foundation casts light on the challenging diagnosis .