Currently now stable and is medicated. That said, over the years he’s been very clear that he is at peace with Christ and is not interested in another fight that will be a burden on others. He had a heart attack in 40’s. Then soon got type-1 diabetes and took shots before every meal since. Smoked for too many years, now has oxygen 24/7 and can barely get up a few steps. This isn’t the fight he would want.
If he’s competent to make his own medical decisions, then HE decides which interventions and treatments he is willing to receive. He may decline and and all of them. If he truly doesn’t want this fight, it’s up to him to say so to the doctors, and to consider an alternative such as hospice care.
If he isn’t competent to make his own decisions, then it’s more complicated.
My dad died earlier this year of cancer. He made the decision not to fight it - wisely, in my opinion. It is very difficult for everyone involved.