Speculation on cancer

We know that cancer is when some human cells are multiplying very fast and then spread all over the organism. The are many substances that seems to be "cancerigenic". However, recently we started to link some cancers to bacterial or viral infections.

What is more probable: that a chemical substance makes a cell to multiply and spread, or some viral/bacterial DNA is reprogramming cells to multiply and spread?



Of course, some substances might create a breach for external DNA, but it seems more likely to me that most of the cancers are based on cells infected with some external DNA, like from viruses or bacteria and substances only favor this process.

This is just a speculation, I don't know enough medicine to know if this hypothesis is clearly dismiss-able or not. But if it's not, it worth to study this hypothesis. This could change a bit the ways to prevent it.


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