It takes 12 years to develop cancer.
What? Do you even know what cancer is?
It's any single cell in which the replication regulation mechanism has broken, AND the telomerase production gene has been turned on, so the replicating cells don't run out of telomere fuse within 40 replications. Every day we all get cells that go haywire and start replicating, but the vast majority don't also get a telomerase switch-on, so the resulting tiny cluster of rogue cells goes senescent, stops replicating and dies before it even gets big enough to see with the naked eye.
The point is, that 'replication regulation mechanism' is very deeply complicated, and far from understood. There are layers and layers of inter-cellular communication via many different channels. Some of them are electrical (nerves), some via ion transfers through tiny specialized pores in cell walls - which act as ion pumps, with or opposed to the electrical potential maintained across the fatty, electrically insulating cell wall.
And everything that goes on in the vastly complicated molecular computing and construction machine that cells are, is ionic. Therefore highly sensitive to electric fields, both static and AC. Of course everyone here insisting EM couldn't possibly have any biological effect, surely knows about the field of microwave chemistry? In which reactions that don't normally occur can be made to happen (and shift reaction outcomes), by exciting reactant molecules with RF tuned to achieve specific modes of vibration of the molecules.
But of course this could never happen in living cells exposed to RF. Because we all use cell phones, wifi, etc, and so it must be safe. (This reasoning is irrational btw. Just to be clear.)
Here's a story.
In Australia we have an amphibious animal call a platypus. They hunt for worms in the sediment at the bottom of creeks. They don't do it randomly, they go straight for the buried worms. Using exquisitely sensitive electric field detectors in their famous duck-like bills. They can actually sense the electric fields produced by a worm's nervous system.
Funny thing. Apparently platypus simply won't breed in captivity. So far as I've heard, no one has any idea why.
But I bet I know. 'Captivity' will mean an enclosure in a zoo. With 240VAC electrical wiring all around, fluro lights, etc, probably all with no attempt made to Faraday cage shield it all. The E fields permeating a platypus zoo living environment are probably many orders of magnitude above what they'd encounter in nature. So Mr & Ms platypus have to put up with their equivalent of someone jack hammering right next to them, 24/7. No wonder they don't breed in captivity.
And another story.
In Jan this year I drove from Sydney to Melbourne in one day. It was a hot sunny day, and I had the driver window open the whole day, so my right hand was in full sunlight virtually the entire day. I happen to also have a skin pigmentation loss in some areas, such as my hands. (Which btw is an auto-immune problem, Vitaligo, there's zero family history of it, and mine developed after taking some flu shots in my 30s, read what you will into that.) Anyway, I got extremely bad sunburn on the un-pigmented area of my right hand. After that healed (about 2 weeks), lo and behold, a couple of small but definite skin cancers got big enough to be visible within a few more weeks. So no, "12 years" is rubbish. It takes exactly as long as some UV photons take to smash up some DNA, scrambling just the right bits of code in just the right way to produce a runaway cell line. Then becoming perceptible depends on replication rate, visibility, symptoms, etc.
One of them was susceptible to a natural cure (B17) and with that it regressed till completely gone over a couple of months. The other's growth was slowed down by it, but didn't stop. Different errors in the cell lines, different behavior. I just had that stubborn one frozen off with liquid nitrogen. Now only a healing scar.