What is "metastasizing"

Usage examples of "metastasizing".

It was apeshit insanity trying to bore up into my forehead and spread through my brain like a metastasizing carcinoma.

With Harry Dunne mysteriously vanished, for whatever reason, Lanchester was the one man in government with both the power and the independence of mind to do something about the Directorate's metastasizing power.

Some of the infected may not undergo any perceptible change, mentally or physically, because they receive DNA fragments from so many sources that there is no focused cumulative effect other than a general destabilization of the system, resulting in rapidly metastasizing cancers and deadly autoimmune disorders.

He went down to the Doc's office, in the basement, conveniently situated by the bar and the morgue (many of Doctor Delazny's patients were victims of the dreaded Pedosphincter Rot, a wildly metastasizing mutant xenocancer killing Troopers by the platoon, whose distant ancestor was athlete's foot, and that struck the nether regions of the human body.