Yes.
Again, I have seen it personally. The story I was going to tell you was about a patient of mine who had stroke-related OCD symptoms in her sixties. I treated her for about two to three years with different types of medication. We tried ECT, and over a five-year period, we were able to get her feeling better. She was able to live 10-15 years afterwards, and she only died related to COVID.
Again, the science is not there. As you said, when you have cancer, a physical biology is driving the death. In mental disorders, there is no biological factor. This is where irremediability is impossible to define.