My father has stage IV non-small cell lung cancer metastasized to the liver. He just started on Tarceva about 10 days ago. His doctor told me it is a second-line treatment, usually given when patients have already had some chemo; however, since my dad is too weak for chemo, there's no reason why they won't let him try Tarceva. You can discuss it with your mother-in-law's doctor and see if this is an option for her since it is supposed to treat certain types of cancer only. This drug has been approved in the U.S. for a couple of years now, but I'm not sure if it is the case in other countries as well. For instance, it has just been approved in HongKong, where my father resides, for a few months only.