That's probably true, but I think large-scale changes are dangerous more often than not.

I'd agree. I think when it comes to discoveries and inventions and the introductions of ideas, we need healthy doses of restraint, caution, wisdom, and inspection. Just because something is possible and easy, doesn't necessarily mean it should be done.

Her answer was cancer treatment.

That's not the first time I've heard that and understandably so. The amount chemicals and/or radiation we expose a person to in an attempt to treat cancer does seem extremely harsh when looked at from a certain angle.