Jtoro
Nexavar is also called sorafenib. We have had people here on that drug but I cant remember who they are or if they are still with us. Try using the search function with both nexavar and then sorafenib and see what pops up. Hopefully someone will be able to give you the information you are looking for.
I think that drug works for both kras wild and kras mutated so it is a good choice if you dont know your kras status.