[tptacek]

I'm not saying that you couldn't develop a super-reliable test for a rare cancer! The point isn't that these cancers are impossible to screen for. The point is that the numbers given in this article do not suggest that such a test has been developed in this case.

[inglor_cz]

It surely does not make sense to screen the entire population for pancreatic cancer, but we already do have a screening for pancreatic cancer in Czechia for "at risk population".

https://www.cgs-cls.cz/screening/program-vyhledavani-rakovin...

For such programs, a blood test would be a huge boon and they could even expand the coverage a bit.