My adult son is refusing cancer treatment because he wants to die. Can I make him great treatment?

I recently found out my 23 year old son has been diagnosed with cancer. My wife passed away when he was a toddler, so he’s all I have. He’s on our insurance still (and will be until he’s 26). He’s refusing treatment because he has a death wish. It’s very treatable, but without treatment, he only has 1-2 years left.... show more I recently found out my 23 year old son has been diagnosed with cancer. My wife passed away when he was a toddler, so he’s all I have. He’s on our insurance still (and will be until he’s 26). He’s refusing treatment because he has a death wish. It’s very treatable, but without treatment, he only has 1-2 years left. (It’s still in the early stages but the cancer can get worse very quickly). We also live in Oregon and he wants physician assisted suicide once the cancer is terminal. I see this as a passive form of suicide. Is there anything I can do to save his life?
Update: I didn't say curable because cancer can never really be cured. However, he could very well go into remission and stay in remission for life according to his oncologist.
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