[chefandy]

Yeah— it's obviously worth interrogating how our environments affect our cancer risk, but considering that the disease was named by Hippocrates in the 300s BCE, it seems pretty unlikely that any single avoidable environmental factor could be "the cause," or any single factor could be "the mechanism."

[benjijay]

Certainly there are myriad 'causes', and likely at least a few mechanisms if you get into specifics, but as a general rule a cancerous tumour is a group of cells that multiply faster than they die (or don't die at all), and consume resources without 'giving back' to the organ in which they reside - effectively the "I have outlived my designated usefulness" switch gets commented out and replaced with "multiply even harder, forever"