That doesn't seem expensive enough. You can't patent Vitamin C. There is no Big Vitamin C to pay for the human trials.
There are dozens of treatments that have shown success at the mouse level.
Mice with cancer live twice as long when given baking soda. In mice, the cancer doesn't spread when the mice are given baking soda.
Baking soda + maple syrup allows the baking soda to get into the tumors and shrink them.
Anybody can go do a search, with the key word pubmed also cancer and add a search for those natural things that are known to have a lot of health benefits. Typically, those super healthy items - turmeric, garlic, ginger, etc also cure cancer to some degree.
It's nice to read that there was yet another mouse study, this time showing fasting + vitamin C = good.
Here's something that scientists have known for close to 100 years. Cancer MUST HAVE SUGAR. The only thing Cancer eats is SUGAR If you could go without eating sugar - cancer gone.