Please, don't let me disturb your theorizing...
The thing about that is that, this is the first chapter of the story.
For all we know, the hit on the head by that creep may have killed the tumor. Or a second one will... or the MC will fall into a vat of chemicals... or be bitten by a radioactive scorpion... or electrocuted while trying to repair the GAS sign for Charlie.
We don't know, because... we can't know.
I'm a reader. Have been all my life. In the several thousands of books I've read, I've never started by reading the end. Even on the second or third reading... The best part is: Not Knowing.
Starting on the first chapter angry because of the possible ends you can imagine... feels... kinda sad... actually. Someone stole your sense of wonderment, your ability to hope, the capacity to try even if you fail in the end. You have allowed your life to become sadder, smaller and... quite clearly... depressing.
This, said by someone that lives plagued by perpetual depression. If I couldn't fight back by refusing to give in to darkness, by lighting as many beacons of hope as I can, I surely would have passed long ago.
The Dev team already told us a beautiful story, with many moments where hope seemed to have ran out. In the end, at least on mine, love and life won. Maybe, who knows, maybe that is the fate of this story too... and if it isn't... maybe it will be beautiful also.
Peace