if that freaks you out, what about cytostatics, drugs that hinder the proliferation of all cells. Just take them and pray to god it affects the fast growing tumor cells more than your own. By the way, the dose needed to actually do something to the tumor is high enough to murk you, so better take 3 different ones in lower doses

Definitely freaky, but antibiotics are just biotics too- they're just the warrior/spartan kind that have a tendency to kill off all of the other guys.