What policy change did the thalidomide crisis impose?

Question

BlackTom AI · Accepted Answer

Thalidomide produced severe limb malformations (phocomelia) in thousands of human infants while early safety testing in common laboratory rodents failed to reveal this risk. That species-specific teratogenicity led regulators to require more rigorous preclinical and clinical testing: specifically, safety testing in at least one rodent and one non-rodent species plus staged clinical trials in humans.

1) Relevant knowledge points and concepts
- Teratogenicity: the ability of a substance to cause birth defects during embryonic development.  
- Species differences: some toxic effects appear in some species but not others; relying on a single species can miss human risks.  
- Regulatory change (Kefauver-Harris Amendments, 1962 and similar laws worldwide): required proof of safety and efficacy, preclinical animal testing, and controlled clinical trials.

2) Step-by-step reasoning
- Historical observation: thalidomide caused widespread birth defects in babies whose mothers took the drug during early pregnancy.  
- Investigation showed that standard rodent tests did not reveal this teratogenic effect, while other species (e.g., rabbits) did display fetal malformations.  
- Because relying on one species produced false negatives, regulators concluded multiple-species testing was necessary to detect risks that are species-specific.  
- Therefore regulatory guidelines were changed to mandate preclinical testing in both a rodent and a non-rodent species to assess toxicity, including teratogenicity, before human trials. Clinical trials (phased and controlled) were also required to demonstrate safety and efficacy in humans.

3) Intermediate steps / specifics
- Preclinical program: acute, subchronic/chronic toxicity, reproductive/teratology studies in one rodent (e.g., rat) and one non-rodent (e.g., rabbit or dog).  
- Only after acceptable animal safety is shown may phased clinical trials (Phase I–III) in humans proceed.

4) Why the correct answer is correct
- The thalidomide crisis directly motivated the requirement for testing in both a rodent and a non‑rodent species plus structured clinical trials, to reduce the chance that a human teratogen would be missed.

5) Why other options are incorrect
- "Test on rodents are sufficient": false—thalidomide is a clear counterexample where rodent tests missed human risk.  
- "Additional test on women during pregnancy": unethical and unsafe; pregnant women are protected populations and cannot be used as initial safety tests.  
- "Chemical analysis test must be performed prior approval": chemical analysis alone cannot predict biological teratogenic effects; functional animal and human studies are required.

6) Conclusion
This explains why the required policy change was testing in one rodent plus one non-rodent species combined with clinical trials, matching the provided answer: One test on rodent + one test on non rodent + clinical trials.

What policy change did the thalidomide crisis impose?单项选择题

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