Nasopharyngeal Cancer Stage IVC

My husband was diagnosed with Nasopharyngeal Cancer with mets to the Liver 09/10. He completed Chemo, then Radiation/Chemo in February. Going back for Pet and MRI in 2 weeks. He had a clean scan before beginning Raidation. Just wondering if there is anyone else out there who responded to just Chemo. If so, how long did remission last? Anyone with a history of mets to the liver? What treatment have you had? Thanks, we have so many questions. I realize, it may be "a time will tell" answer. Hard not to worry!