Is there any evidence that this type of -entirely inhumane- testing has ever yielded results that a person could argue justifies the cruelty? I feel like all I ever hear is that rat/mice testing is effectively inapplicable to humans… I don’t even know where the line is, but I feel like we’re nowhere near it, if it even exists at all.

edit, for clarity: I think be have gone well beyond wherever the ethical line is, not below/beneath… for the first time I was confused by the downvotes, maybe that explains it?

In fact there are many counter examples. Thalidomide had no negative effects on non-human animals, but created notoriously deformed children in humans. Similary, I think it was paracetamol which when tested on some non-human animal is 100% lethal, and had they tested on those species then this common, essential medicine would never have progressed to the human trial stage. A classic case is the link between lung cancer and smoking. Millions of dollars of public money went to the big tobacco companies in the name of "cancer research". Dispite being able to induce lung cancer in dogs by restraining them and forcing the to chain smoke for hours on end, these were not the results they wanted. IIIRC, it took research with human volunteers before the scientific consensus that we have today came about because the "animal models" did not represent human physiology.

> Thalidomide had no negative effects on non-human animals, but created notoriously deformed children in humans

That's not actually true; it causes birth defects in animals as well. Only limited animal testing was performed before it was approved for use in humans; more extensive animal testing, which did demonstrate birth defects, was performed only after it had been withdrawn due to causing human birth defects.

https://pubmed.ncbi.nlm.nih.gov/12677202/

> Thalidomide had no negative effects on non-human animals, but created notoriously deformed children in humans.

Thalidomide was never approved for treating in nausea in pregnant women in the US. It was prescribed off label, but the FDA rejected it for that purpose.

Why did the FDA reject it if animal tests didn’t show deformities?

To be clear, that’s not a rhetorical question. I’ve heard rumors the FDA wasn’t convinced thalidomide would be effective - which is very different from worries over fetal abnormalities.

Do you know the background there?

I believe the studies were done with a single isomer, which was safe and is still available. The racemic mixture was sold commercially but never tested until later. IIRC the bench top process produced a single isomer, but the scaled up process messed with the chirality producing the racemic mixture.

Yeah this was the real problem with Thalidomide. It pops up as an example of "things to consider" in DD textbooks.

>In fact there are many counter examples

I think you inverted the meaning of the parent comment. They asked for exceptions where animal experiments do apply to humans, saying that the rule seems to be they don't.

Transplanting a uterus to a genetic male was done many years ago, to a human, voluntarily, and of course it didn't work. This was prior to modern gender reassignment surgery.

Given the context that this experiment supposedly achieved something humans have wanted enough to risk their lives for, for quite some time, it seems like an astonishing accomplishment.

I, personally, would not trade these rats lives for a uterus, but I don't feel like I can decide for the rest of humanity.

There also must be an awful lot of research that's gone into fertility treatments in the past, was that justified, when it wasn't about the "unnatural" goal here?

As I recall, there are some lab animals that are regulated, and some are not. And I don't remember exactly which, but it seemed kind of arbitrary.

According to the pre-print, these researchers are based at "Naval Medical University, Shanghai, China" - a country with a terrible record of human rights violations and an even worse record when it comes to animal rights. Of 3,000 people surveyed in China, approximately 2,000 hadn't heard of the concept of "animal welfare". I'd be surprised if regulation on non-human animal experiements even existed in their jurisdiction.

Sometimes I wonder if Chinese scientists are going to make scientific advances that Western scientists won't, due to weaker ethical constraints enabling them to perform experiments that Western scientists can't, or lesser regulations enabling them to get the same experiments done faster and cheaper.

If only they had accelarated a COVID-19 vaccine by a few months via human challenge trials.

Yes, I'm saying, in the US, where we may pride ourselves on having standards, there are some lab animals that are exempt, and so I think there's a blind spot, where nobody (in the sense of the lay public) thinks about what's happening to them.