Can you help me understand how It has become common that those that are in late stages of diseases or are terminally will have requested to use

Can you help me understand how It has become common that those that are in late stages of diseases or are terminally will have requested to use whatever drug they want. This means exploration of those treatments that may show promise in animal studies or that are still in the early stages of human trials. I dont know the ethical and legal components of this. Will this really help?