[willmadden]

I don’t see any reference to genetically engineering the rats to get cancer in the studies I linked. The results are terrifying in rodents.

[washadjeffmad]

A little more info on that: https://www.criver.com/eureka/evolving-mouse-model-cancer-re...

You might have to search for "transgenic" or other specific terminology to locate what model they used in the study, but they're assuredly not field mice or something you'd find in a pet store.

Here's a sample of a catalog: https://emodels.criver.com/search?term=*&species=Mouse