It is even worse than this as by controlling the number of cells injected you can make it very easy to cure the cancer.

The reason why this is done is it is much easier to do than the experiments that should be done. It is like the old joke about the drunk looking for his keys under the street light because the light is better despite have lost them in dark alley behind.

I hope organ generation/printing will help avoid these tricks. Isn't it the most promising way to make real progress ?

The most promising way would be to stop funding research if it is not done correctly and stop allowing people to publish papers with “play” research. No more use of inbred mice lines, more more injecting known cancers (only use natural cancers), no more testing of treatments that have no chance of working in humans.

The best suggestion I have seen is to make better use of all the millions of pets we have. Dogs and cats get cancer that is very similar to human cancer (much more so than mice) and these are all natural cancers. We need to encourage people to sign up their pets for cancer treatment and conduct many more trials in pets. The fact that we don’t do this at any scale is a sign that we are not too serious about curing cancer.

Involving people to treat their pet with current medicine looks like borderline impossible. If people think their dog will suffer they will skip that.

And research funding is probably conservative, since mice is the 'less bad' idea, money flow this way. Some competition may help changing habits.

There pet is already suffering - it has cancer after all. The alternative in most cases is to put the dog down.

More importantly this question has already been asked by researchers and most people are happy for their pets to participate in such trials especially when they know they are really helping cure cancer.

Aight then, my folk-understanding was off. Hoping it will help making steps.