It is always best to get a 2nd opinion if at all possible. Even if the protocol you are suggesting didn't sound unusual to any of the more learned people on this forum (myself being so new as to not qualify) having a 2nd opinion will be more than helpful. You don't want either you or your father to lack any confidence in the care he's receiving when he's in the midst of an unpleasant treatment. It is yet another piece of the psychological puzzle that gets overlooked. You'll want to be able to move forward knowing he is getting the best possible care specific to your father's diagnosis. And, you'll want to be committed to your treatment protocol without having to worry that it is the right one.