What Causes Stage-2 Prostate Cancer, Low BP And Hemoglobin And Kidney Infection?

my dad was found unresponsive a few days ago and it appeared he could have been that way for a few days before found. He is in ICU, no stroke, no heart issues. Kidney infection, low blood pressure, low hemoglobin. He is diabetic and 74 yrs old with stage 2 prostate cancer. How long can he live in this unresponsive state? They put him on dialysis and he is on a ventilator.