I havent read through all comments here but humans do not benefit from animal experiments, there is nothing to weigh up here. In fact animal "testing" and "research" is the main cause of human illness. The animal "tested" products(chemicals, pesticides, carcinogens (including tobacco), teratogens etc harm humans then the animal based 'research' consistently fails to cure any human disease. The onus is on supporters of animal experiments to identify even one species of animal which is PREDICTIVE for humans. This is fundamental. No such species exists. Even monkeys are not predictive for humans eg "Drugs known to damage the human foetus are found to be safe in 70% of cases when tried on primates." Developmental Toxicology: Mechanisms and Risk, p313, McLachlan, Pratt, and Markert (Eds). 1987
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This sums up the real motives for animal "tests"..."Animal studies are done for legal reasons and not for scientific reasons. The predictive value of such studies for man is meaningless."
- Dr James D. Gallagher, Director of Medical Research, Lederle Laboratories, Journal of the American Medical Association, March 14 1964.
To wit..."92% of new drugs fail in clinical trials, after they have passed all the safety tests in animals." US Food and Drug Administration (2004) Innovation or Stagnation, Challenge and Opportunity on the Critical Path to New Medical Products.
"Information from one animal species cannot be taken as valid for any other. It is not a matter of balancing the cruelty of suffering animals against the gain of humanity spared from suffering, because that is not the choice. Animals die to enable hundreds of new drugs to be marketed annually, but the gain is to industry, not to mankind."---The 1963 Report of the British Pharmaceutical Industry's Expert Committee on Drug Toxicity
"Animal studies can neither prove or guarantee the safety of any drug. They are not a substitute for testing in humans".--J Jennings, Vice President Science & Technology of Pharmaceutical Manufacturers Association.
Dr Herbert Gundersheimer, "Results from animal tests are not transferable between species, and therefore cannot guarantee product safety for humans…In reality these tests do not provide protection for consumers from unsafe products, but rather are used to protect corporations from legal liability."
Report of the Medical Research Council "It must be emphasized that it is impossible to extrapolate quantitatively from one species to any other species."
The Lancet, "We know from drug toxicity studies that animals are very imperfect indicators of human toxicity: only clinical experience and careful control of the introduction of new drugs can tell us about their real dangers."
Dr Ralph Heywood, former scientific director of Huntington Life Sciences, one of the largest contract research laboratories in the world speaking to the CIBA Foundation said "The best guess for the correlation of adverse toxic reactions between human and animal data is somewhere between 5% and 25%" and "90% of our work is done for legal and not for scientific reasons."
For more honest quotes from doctors and scientists see
http://www.safermedicines.org/quotes/cancer.shtml
If there is a particular claim made here which people would like me to respond to please present it again in case i dont read through all comments