So, you get the idea:
go to a CCC
do not have treatment until you get a second opinion

Also, the one-size-fits all approach to treatment is not the best one. However, you will find protocol by using the link Christine gave you for the NCCN guidelines. When you get on the main page, you have to sign up for access (just user name/email and password) then you're in. At the far left of the first page there is a link to guidelines. Get into that, then you will go to Head and Neck Cancer, then either to oral cavity or oropharyngeal. Why do these two have different links? Because the treatment protocol is different from each other. If his cancer is in the part of the tongue that is in the mouth, it is oral cavity cancer, if way back in the throat, it is oropharyngeal. You'll see that surgery is the protocol for oral cavity cancer, but definite radiation, plus other treatment is often the first choice for the other.

With this tool once you know what he has (ask questions, get the reports) you can see at least in general what needs to be done. They won't tell you everything, as in "surgery to excise the entire tongue" for instance. It may have to be that way, but maybe not. We have members of this forum that have gone through this surgery and can tell you more about that if it comes to this.

It is a lot of work to research these things but it is time well spent. Your brother is lucky to have you helping him.

Anne