Maybe cancer is way to common and keeps being formed in the human body... but also the body gets rid of it by itself. This is why most people who have cancer never find out about it.
The few people who are always going for "regular screenings" are the only ones who find out about it and get "treatment" when it was completely unnecessary.
Here's another alternate explanation:
Maybe what is marketed as "healthy" by the food industry by funding scientific research and selecting results favorable to them is not really healthy.
But not everyone is so lucky. Some cancers may kill you in a few months even with the best treatment currently available.
And there are a big chunk of cases were a good early diagnosis is the difference between dying in one or two years or dying in ten or twenty years, or perhaps more.
RCT with two groups of (similar demographic) people. Everyone is given a full body checkup for finding cancer. Half of them are treated for any cancer found and the other half are left as is.
Check the longevity and status of cancer in both groups.
Maybe cancer is way to common and keeps being formed in the human body... but also the body gets rid of it by itself. This is why most people who have cancer never find out about it.
The few people who are always going for "regular screenings" are the only ones who find out about it and get "treatment" when it was completely unnecessary.
Here's another alternate explanation:
Maybe what is marketed as "healthy" by the food industry by funding scientific research and selecting results favorable to them is not really healthy.