No, but the answer to your question is more about where the primary was. The lymph nodes in your neck run in horizontal rows, starting with the submandibular nodes directly under the edge of your jaw line. So a floor of the mouth cancer is right there next to them in close and quickly accessed proximity. This is a dangerous place for a primary to be. Likewise the posterior of the mouth is closer to high densities of lymph tissues and nodes, and therefore mets to lymph nodes in that area tend to happen quicker than say from a tongue cancer. But once it is in a node chain (starting with the sentinel node in the beginning of the chain, assumptions are made that visible or not, the rest of that chain is suspect and has to go.) cure rates decline. The more nodes involved, and if the nodes on both sides of the neck are involved as in my case, the worse the odds. Though published data specifically isn