We've had our second opinion appointment yesterday, and now it seems like the next step is an operation - probably next Friday, although that requires slot availability confirmation before we can buy our tickets to this unique theater that you never really want to visit.
Only after the operation and its subsequent pathological examinations will we be able to know whether that was it and it's game over or whether we'll need to go through additional exciting stuff like chemo or radio therapy.
The uncertainty of not knowing what's going on exactly and not really being able to know what is going on, plus the crudeness of the medical techniques at hand, with actions ranging from "chop it off" through "poison it" and culminating in "nuke it", demonstrate one generic truth to me:
We, as in humanity, think we're so advanced and we know it all, when in fact we don't know shit. The amount of unknown stuff in this universe far surpasses what we know, and in the grand scheme of things we are still ruled by small (or, for that matter, large as well) seemingly random events that are totally beyond our control.
Some of us look to their gods for answers, while others think they are the gods themselves. But in reality, there is not much of a difference between us and, say, ants.
An update from later: the operation was confirmed for next Monday morning. The 11th of September will have yet another reason to be remembered.