You could try the Akira manga if you haven’t read it already. It certainly has some body-horror elements, although not to the level of Ito, and it’s a lot more substantial than something like Gantz.
Mayyybbe Gunnm (Battle Angel Alita) as well? Hard to say. It can be a bit fluffier than the rest at times, but it certainly has it’s share of hyper-violent parts too.
(Full disclosure, I haven’t read those in years, so YMMV.)
Ito really is in a class of his own, so if that’s your bar, it’ll be pretty hard to clear.