Dehydration isn't good for you generally.
And when my dad was told to get his affairs in order, his cancer was going to kill him, hydration was a big focus for my parents. He lived another two decades.
So obviously I'm an idiot and it's "anecdata" and I can't cite any large scale studies, but I can wonder in good faith if hydration might impact cancer for more people than just my father.
And the Houston Clinic interviewed my mother on tape for two hours because they knew they didn't keep him alive, she did, and changed their practices because of what she said. So people with better medical credentials than "My daddy didn't die when he was supposed to" also thought maybe something my parents did was significant.
+100 on cancer support via nutrition and hydration though. Folks don't realize how many cancer outcomes are exacerbated by "I just won't get my nutrients checked and continue with my normal diet." Your body is fundamentally different, especially on chemo, and needs different support.
Maybe someone more invested in this question will go down a rabbit hole and share. I was just doing a gut check of my knee jerk reaction of "But what I know of the human body...."
Something like hepatorenal syndrome [0] would be a liver to kidney collapse, but that's more to do with blood supply.
[0] https://my.clevelandclinic.org/health/diseases/23399-hepator...
Gets me:
Yes (in big bold lettering) followed by a statement that it increases sodium and thickens the blood, interfering with circulation, which my cheap phone is refusing to let me copy-paste.