

There are some unifying theories of cancer that do kinda make it into one thing: https://doi.org/10.3389/fcell.2015.00043
I.e. the Warburg effect, and damaged mitochondria being st the root of all cancers.
In your example the flu is not just one thing either, it’s a group of viruses that broadly have the same symptoms











Actually it’s used in everything, it’s available, it’s well studied, it’s cheap, and most importantly it grows fast in a lab, so it’s easy to work with…
I wish I was joking, but lots of in vitro human research is done on the poor women’s cancer cells when the research has nothing to do with cancer, it’s quite the confounder