Even more problematic for Big Pharma is that a good many over-the-counter supplements ALSO fight cancer, and in many cases do so strongly, often by multiple pathways, and without horrid side effects. The most common "side effect" from most natural supplements isn't liver damage or kidney failure or the like, but "better overall health." For example, curcumin, from the spice turmeric:

https://search.nih.gov/search?utf8=✓&affiliate=nih&query=curcumin+and+cancer&commit=Search

Edit: from The versatile role of curcumin in cancer prevention and treatment: A focus on PI3K/AKT pathway

Curcumin exerts its anti-cancer effect by suppressing the initiation, progression, and metastasis of a variety of cancers and appears to inhibit carcinogenesis by affecting two main processes: angiogenesis and tumor growth.

Even more problematic for Big Pharma is that a good many over-the-counter supplements ALSO fight cancer, and in many cases do so strongly, often by multiple pathways, and without horrid side effects. The most common "side effect" from most natural supplements isn't liver damage or kidney failure or the like, but "better overall health." For example, curcumin, from the spice turmeric:

https://search.nih.gov/search?utf8=✓&affiliate=nih&query=curcumin+and+cancer&commit=Search