And part of what she's spending her borrowed time on Earth doing is protesting the practices that put profits before people.
And here I thought it was public healthcare that was going to do that.As Miran Istina puts it, she has been living on borrowed time since she was 14. Diagnosed with cancer, she was given just months to live after her health insurer refused to provide her with life-saving surgery.
Now 18, Istina, from the city of Sisters in Oregon, has spent the past three weeks living in a tent at the Occupy San Francisco protest and says she will stay there indefinitely, despite her illness.
She was inspired to take part in the protest by the refusal of her insurance company to pay for treatment for her chronic myelogenous leukaemia.
She said: "They denied me on the terms of a pre-existing condition. Seeing as I had only had that insurance for a few months, and I was in early stage two which meant I had to have had it for at least a year, they determined it was a pre-existing condition and denied me healthcare."