[cloudjacker]

The problem with that logic is that nobody knows the speed with which cancer multiplies.

Even if you got checks down to three months (which no insurance would cover), it would still be like finding a fetus growing inside your colon but too bad it already pierced into other organs because there is no room for fetuses to grow there

The fetus analogy practical because many women don't figure out that are pregnant in the first trimester.

[taneq]

I'd never thought of cancer like that before. You're pregnant with a fetus which is constantly reproducing, trying to make a fetus army in your organs.

[Angostura]

The process of pregancy is, in many respects rather like a parasitic infection. The foetus is very good at dampening the mother's defences to it.