I actually believe this is true. I remember the Shark Cartilage rage a few years ago and it just turns out that Shark Cartilage happens to have a high alkaline content. Also, there's more then enough evidence that raw almonds (very difficult to find; my ex-boss was diagnosed with cancer a few years back; I talked with his son the other day and he told me that he's still kicking. He started heavily eating raw almonds and told me the benifits and how the pharmaceutical companies wanted to surpress this not to mention making raw uncooked almonds next to impossible to get) also has very high anti-cancer properties and it happens to have very high alkaline content. Most teas and coffee too have high alkaline content and there's more then enough evidence that they too help prevent cancer. I'm nearly convinced that cancer can be suppressed by increasing the alkaline levels in the body. Maybe heavy breathing can help with this (I didn't say higher oxygen intake; taking rapid deep breaths) too by increasing alkaline levels. Might also be why walking helps reduce incidence of cancer not to mention have other health benefits (I'm a walker by the way). Note that, here in the U.S., there's a high incidence of cancer and it just so happens that our diet is quite high in acidic foods such as beef, milk, and other fatty foods including processed ones. Anyway I just felt like this link, which I got in an email, was important enough to share.
http://blog.imva.info/medicine/baking-soda-cancer-laugh