I can't speak either way on the cancer effects, but fun fact to all reading, NAC is a great glutamate mop because glutathione is made of 3 amino acids, IIRC, and glutamate is one of them. NAC is literally just glutathione without the glutamate, and it crosses the BBB and such more easily too, I believe?

In any case, it grabs onto free glutamate, and, whammo! less glutamate, instant glutathione. quite the nifty trick.

has some interesting data/studies backing it up, and also has some great psychiatric effects as well. IIRC it's used for schizophrenia among other things.