Assume you’re life-lusted and are willing to abandon every moral you have just to live. Paying for cancer treatment is also worth prison time to you.
Also assume you’ve exhausted all ethical fundraising options, i.e. GoFundMe, loans, etc. and that insurance won’t cover treatment for whatever reason.
You don’t need money to receive treatment in the US. But to answer the prompt, I’d just rob a bank with a note and no weapon. Immediately surrender when the police arrive and spend the next few years in prison getting 100% free healthcare