Hey there.. surgery should have been the first option based on the type and location of the cancer but sometimes they will work with chemo and rads first to try and shrink it seeing as it appears to be quite invasive. No one here is a dr. However based on what you've posted I would be willing to bet they will be replacing your mandible. It's not an easy surgery but there are quite a few people here who have had it done.

I'm sure some of them will share their experiences.

chances are if they are removing your mandible they will rebuild it with a bone from your leg.

This whole procedure is very intricate, as others here have mentioned you should be at a CCC - a good one. And your surgeon needs to be an ENT who deals exclusively with oral cancer. A plastic surgeon should also be part of a plan as your ENT removes the tissue and cancer, and the plastics guy will rebuild your mandible, and tongue.

hugs and please keep us up to date on what is happening with you.