Why Choose Alternative Cancer Treatments (14)

It is in fact hard to find a single, common solid neoplasm [cancer] where management and expectation of cure has been markedly affected by animal research. Most human cancers differ from the artificially produced animal model....
Dr. Harrison in Clinical Oncology 1980;16:1-2

Welcome to page fourteen of Why Choose Alternative Cancer Treatment? which continues to put the spotlight on...

Contemporary Animal Experimentation

excerpted from A Critical Look at Animal Experimentation published by © Medical Research Modernization Committee, 2002

. Part 1.

Increasing numbers of scientists and clinicians are challenging animal experimentation on medical and scientific grounds.1-3 Considerable evidence demonstrates that animal experimentation is inefficient and unreliable, while newly developed methodologies are more valid and less expensive than animal studies.

A. Selected Diseases

1. Cancer

In 1971 the National Cancer Act initiated a "War on Cancer" that many sponsors predicted would cure cancer by 1976. Instead, this multibillion dollar research program has proven to be a failure. The age-adjusted total cancer mortality rate climbed steadily for decades31,32 until the early 1990s, when this rate started to fall slowly, due largely to reduced smoking.33

In order to encourage continued support for cancer research--now exceeding two billion dollars annually--researchers and administrators have misled the public. In 1987, the U.S. General Accounting Office (GAO) found that the statistics of the National Cancer Institute (NCI) "artificially inflate the amount of 'true' progress," concluding that even simple five-year survival statistics were misused.34 For one thing, the NCI termed five-year survival a "cure" even if the patient died of the cancer after the five-year period. Also, by ignoring well known statistical biases, the NCI falsely suggested advances had been made in the therapy of certain cancers.34 Commenting on the research program's discouraging results, epidemiologist John Bailar III has stated, "The more promising areas are in cancer prevention."31

Why hasn't progress against cancer been commensurate with the effort (and money) invested? One explanation is the unwarranted preoccupation with animal research. Crucial genetic,35 molecular,36 immunologic,37 and cellular38 differences between humans and other animals have prevented animal models from serving as effective means by which to seek a cancer cure. Cancer researcher Jerome Leavitt has explained that human cancer "may have critical mechanical differences which may in turn require different, uniquely human approaches to cancer eradication."36


Despite extensive use, animal models have not contributed significantly to AIDS research. While monkeys, rabbits, and mice born with severe combined immunodeficiency can be infected with HIV, none develops the human AIDS syndrome.39 Of over 100 chimpanzees infected with HIV over a ten year period, only a few have become sick.40 Even AIDS researchers acknowledge that chimpanzees, as members of an endangered species who rarely develop an AIDS-like syndrome, are unlikely to prove useful as animal models for understanding the mechanism of infection or means of treatment.41 Other virus-induced immunodeficiency syndromes in non-human animals have been touted as valuable models of AIDS, but they differ markedly from AIDS in viral structure, disease symptoms, and disease progression.42 Animal researcher Michael Wyand, discussing anti-AIDS therapy, has acknowledged:

“Candidate antivirals have been screened using in vitro systems and those with acceptable safety profiles have gone directly into humans with little supportive efficacy data in any in vivo [animal] system. The reasons for this are complex but certainly include . . . the persistent view held by many that there is no predictive animal model for HIV infection in humans.”43

AIDS researcher Margaret Johnston has concurred, "HIV/AIDS [animal] models have not yielded a clear correlate of immunity nor given consistent results on the potential efficacy of various vaccine approaches."44

Human clinical investigation has isolated the AIDS virus (HIV), defined the disease's natural course, and identified risk factors.45 In vitro (cell and tissue culture) research using human white blood cells has identified both the efficacy and toxicity of anti-AIDS medicines, including AZT,46 3TC,47 and protease inhibitors.48 Federal law, however, still mandates unnecessary animal toxicity testing.

4. Genetic Diseases

Scientists have located the genetic defects of many inherited diseases, including cystic fibrosis and familial breast cancer. Trying to "model" these diseases in animals, researchers widely use animals--mostly mice--with spontaneous or laboratory-induced genetic defects. However, genetic diseases reflect interactions between the defective gene and other genes and the environment. Consequently, nearly all such models have failed to reproduce the essential features of the analogous human conditions.62 For example, transgenic mice carrying the same defective gene as people with cystic fibrosis do not show the pancreatic blockages or lung infections that plague humans with the disease,62 because mice and humans have different metabolic pathways.63

B. Toxicity Testing

Numerous standard animal toxicity tests have been widely criticized by clinicians and toxicologists. The lethal dose 50 (LD50), which determines how much of a drug, chemical, or household product is needed to kill 50 percent of a group of test animals, requires 60 to 100 animals (usually rats and mice), most of whom endure great suffering. Because of difficulties extrapolating the results to humans, the test is highly unreliable.64 Also, since such variables as an animal's age, sex, weight, and strain can have a substantial effect on the results, laboratories often obtain widely disparate data with the same test substances.65,66 In vitro tests could potentially completely replace the LD50.66-68

The Draize eye irritancy test, in which unanesthetized rabbits have irritant substances applied to their eyes, yields results that are inherently unreliable in predicting human toxicity.69 Humans and rabbits differ in the structure of their eyelids and corneas as well as their abilities to produce tears. Indeed, when comparing rabbit to human data on duration of eye inflammation after exposure to 14 household products, they differed by a factor of 18 to 250.70 A battery of in vitro tests would be less expensive and likely more accurate than the Draize test.65,71

Animal tests for cancer-causing substances, generally involving rodents, are also notoriously unreliable. Science editor Philip Abelson has asked, "Are humans to be regarded as behaving biochemically like huge, obese, inbred, cancer-prone rodents?"72 Of course, humans are not. Of 19 known human oral carcinogens, only 7 caused cancer in nonhuman animals using the standard NCI protocol.73 Even different rodent species produce conflicting results. When Lester Lave et al. compared rat and mouse carcinogenicity for 214 chemicals, they found a correlation of only 70 percent.74 (Chance alone would yield a 50 percent correlation.) A combination of in vitro tests provides data that compare favorably with existing carcinogenicity databases and costs far less than animal tests.75

Scientific Limitations of Animal Models

Animal studies can neither confirm nor refute hypotheses about human physiology or pathology; human clinical investigation is the only way such hypotheses can be tested. At best, animal experiments can suggest new hypotheses that might be relevant to humans.80,81 But, there are countless other, often superior, ways to derive new hypotheses.2,80

How valuable is vivisection? The Medical Research Modernization Committee's review of ten randomly chosen animal models of human diseases did not reveal any important contributions to human health.82 Although the artificially induced conditions in animals were given names analogous to the human diseases they were intended to simulate, they differed substantially from their human "counterparts" in both cause and clinical course. Also, the study found that treatments effective in animals tended to have poor efficacy or excessive side-effects in human patients.82 Indeed, when MRMC physicians evaluate specific animal-research projects, they consistently find them of little, if any, relevance to the understanding or treatment of human diseases.83-89

MRMC's reviews have revealed that, because animal models differ from human diseases, researchers tend to investigate those aspects of the animal's condition that resemble features of the human disease, generally ignoring or discounting fundamental anatomical, physiological, and pathological differences. Because most disease processes have system-wide effects and involve many interacting factors, focusing on only one aspect of a disease belies the actual complexity of biological organisms.

In contrast to human clinical investigation, vivisection involves manipulations of artificially induced conditions. Furthermore, the highly unnatural laboratory environment invariably stresses the animals, and stress affects the entire organism by altering pulse, blood pressure, hormone levels, immunological activities, and myriad other functions.90,91 Indeed, many laboratory "discoveries" reflect mere laboratory artifact.9,92-98 For example, artifact from unnaturally induced strokes in animals has repeatedly misled researchers.99 In the 1980s researchers reported 25 compounds that reduce ischemic-stroke damage in nonhuman animals, but none proved effective in humans.96 Subsequently, agents showing efficacy in animals have been unhelpful or even hazardous for human patients.100,101

Animal tests frequently mislead.102 Milrinone increased survival of rats with artificially induced heart failure, but humans taking this drug experienced a 30% increase in mortality.103 Fialuridine appeared safe in animal tests, but it caused liver failure in 7 of 15 humans taking the drug, five of whom died and two required liver transplantation.104 Animal studies failed to predict dangerous heart valve abnormalities in humans induced by the diet drugs fenfluramine and dexfenfluramine.105 Similarly, tests in monkeys failed to predict side-effects (jaundice, blood-clotting disorder, kidney failure, and lung failure) that killed an 18-year-old gene therapy patient in September 1999.106

The General Accounting Office reviewed 198 of 209 drugs marketed from 1976 to 1985 and found that 52% had "serious postapproval risks" not predicted by animal tests.107 56 of 548 drugs (10%) approved between 1975 and 1999 were removed from the market or needed one or more special warnings for possible serious or life-threatening side-effects.108 Despite extensive animal testing, adverse drug reactions remain a leading cause of mortality in the United States, accounting for roughly 100,000 deaths per year.109

In animal tests of saccharin's carcinogenicity, the weight-adjusted daily saccharin dose given to rats was equivalent to a human's consuming about 1,100 cans of saccharin-containing soda. Such massive dosing itself can result in cancers, regardless of a compound's actual carcinogenicity at typical human exposure levels.95 Extrapolating such data to humans is further complicated by the observation that saccharin-induced bladder cancers occurred only in male rats. It was later found that male rats possess a protein in greater quantity than female rats (and lacking in humans) that interacted with saccharin to form irritating crystals in the male rats' bladders, causing cancer. The fact that some rats developed cancers did not (and cannot) clarify whether or not saccharin causes cancer in humans.110

Scientists recognize that, just within humans, gender, ethnicity, age, and health can profoundly influence drug effects.111,112 Obviously, extrapolating data between species is much more hazardous than within species. Consequently, animal studies are reliable at only the crudest levels—such as the ability of strong acids to damage eyes. However, such effects can be assessed easily with in vitro systems. For more subtle effects, animal models are unreliable.113

Animal Research Risks

In addition to squandering scarce resources and providing misleading results, vivisection poses real risks to humans. The mindset that scientific knowledge justifies (and may require) harming innocent individuals endangers all who are vulnerable. Even after [purported] experiments on prisoners horrified the world, American researchers denied African-American men syphilis treatment in order to assess the disease's natural progression,114 injected cancer cells into nursing home patients,114 subjected unwitting patients to dangerous radiation experiments,115 and, despite no chance of success, transplanted nonhuman primate and porcine organs into children, chronically ill, and impoverished people.116 Psychiatrist Robert Jay Lifton argues that this "science at any cost" mentality may have provided medical justification for the Holocaust.117

Furthermore, through animal research, humans have been exposed to a wide variety of deadly nonhuman primate viruses. About 16 laboratory workers have been killed by the Marburg virus and other monkey viruses, and there have been two outbreaks of Ebola in American monkey colonies.118-120 Polio vaccines grown on monkey kidney cells exposed millions of Americans to simian virus 40, which causes human cells to undergo malignant transformation in vitro and has been found in several human cancers.121 Ignoring the obvious public health hazards, researchers transplanted baboon bone marrow cells into an AIDS patient. The experiment was unsuccessful;122 moreover, a large number of baboon viruses, which the patient could spread to other people, may have accompanied the bone marrow. Indeed, vivisection may have started the AIDS epidemic. HIV-1, the principal AIDS virus, differs markedly from any virus found in nature, and there is evidence that it originated either through polio vaccine production using monkey tissues 123,124 or through manufacture in American laboratories, where HIV-like viruses were being produced by cancer and biological weapons researchers in the early 1970s.125

Failing to learn from the AIDS epidemic, many policy makers and industrial interests support animal-to-human organ transplants (from pigs and primates) known as xenotransplants. These have failed in the past, and are likely to continue to fail, because of tissue rejection, the impossibility of testing animal tissues for unknown pathogens, and the prohibitive expense.126-128

Relatedly, the growing field of genetic engineering includes adding genetic material to animals’ cells to change the animals’ growth patterns or induce the animals to produce human proteins in their milk, food, or urine. This poses serious human risks, such as exposure to pathogens (viruses, prions, and other microorganisms)129,130 or development of malignancies,131,132 allergic reactions,133 or antibiotic resistance.134 These concerns contributed to the European Union’s ban on rBGH, a genetically engineered bovine growth hormone that increases cows’ milk production.135
Compare Milk & the Cancer Connection II: Recombinant Bovine Growth Hormone (rBGH), Insulin-Like Growth Factor-1 (IGF-1) & Cancer Risk

The Importance of Clinical Research

Typically, medical discovery begins with a clinical observation,8,9 which animal researchers then try to mimic with artificially induced animal conditions.6 These researchers tend to highlight animal data that accord with the previous clinical finding, while discounting or ignoring conflicting animal data (which are usually voluminous). Although animal research advocates routinely take credit for discoveries that actually occurred in a clinical context,6 many clinicians have recognized the primary role of human-based clinical research. Reviewing the history of hepatitis, physician Paul Beeson concluded:

“Progress in the understanding and management of human disease must begin, and end, with studies of man. . . Hepatitis, although an almost 'pure' example of progress by the study of man, is by no means unusual; in fact, it is more nearly the rule. To cite other examples: appendicitis, rheumatic fever, typhoid fever, ulcerative colitis and hyperparathyroidism.”10

Similarly, key discoveries in immunology,11 anesthesiology,12 first aid,136 alcoholism 60,137 and psychopharmacology138-139 were based primarily on human clinical research and investigation. Furthermore, clinical research is the only means by which effective public health education and prevention programs can be developed and evaluated.

Non-Animal Methodologies

In science, there are always many ways to address a given question. Vivisection is generally less efficient and reliable than many non-animal methods, which include:

1. Epidemiology (Population Studies)

Medical research has always sought to identify the underlying causes of human disease in order to develop effective preventive and therapeutic measures. In contrast to artificial animal model conditions that generally differ in causes and mechanisms from human conditions, human population studies have been very fruitful. For example, the identification of risk factors for heart disease, so important for prevention techniques, derives from epidemiological studies.140 Similarly, population studies have shown that passive smoking doubles the risk of developing lung cancer.141

Epidemiology's potential is illustrated by the growing field of molecular epidemiology. Researchers can analyze cellular and molecular characteristics of those suffering from cancer or birth defects, thereby elucidating the mechanisms and causes of DNA damage and yielding effective prevention and treatment approaches.142

2. Patient Studies

The main source of medical knowledge has always been the direct study of human disease by closely monitoring human patients. For example, cardiologist Dean Ornish has demonstrated that a low-fat vegetarian diet, regular exercise, smoking cessation, and stress management can reverse heart disease.143 Similarly, Caldwell Esselstyn has shown that lowering cholesterol levels with plant-based diets and medicines as needed arrests and often reverses heart disease.144 Human cancer syndromes have played important roles in understanding more common forms of cancer.145 Henry Heimlich has relied exclusively on human clinical investigation to develop techniques and operations that have saved thousands of lives, including the Heimlich Maneuver for choking and drowning victims, the Heimlich operation to replace the esophagus (throat tube), and the Heimlich Chest Drainage Valve.136,146

Modern non-invasive imaging devices such as CAT, MRI, PET, and SPECT scans have revolutionized clinical investigation.147-150 These devices permit the ongoing evaluation of human disease in living human patients, and have contributed greatly to medical knowledge.

3. Autopsies and Biopsies

The autopsy rate in the United States has been falling steadily, much to the dismay of clinical investigators who recognize the value of this traditional research tool.151,152 Autopsies have been crucial to our current understanding of many diseases, such as heart disease,151 appendicitis,151 diabetes153,154 and Alzheimer’s disease.83 Although the usefulness of autopsies is generally limited to the disease's lethal stage, biopsies can provide information into other disease stages. Diagnostic needle and endoscopic biopsies often permit safe procurement of human tissues from living patients [but compare Biopsies can spread cancer]. For example, endoscopic biopsies have demonstrated that colon cancers derive from benign tumors called adenomas. In contrast, colon cancers in a leading animal model appear to lack this adenoma-to-carcinoma sequence.155,156

4. Post-Marketing Surveillance

Because of computer technology, it is now possible to keep detailed and comprehensive records of drug side effects.157 A central database with such information, derived from post-marketing surveillance, enables rapid identification of dangerous drugs.158 Such a data system would also increase the likelihood that unexpected beneficial side effects of drugs would be recognized. Indeed, the anti-cancer properties of such medications as prednisone,159 nitrogen mustard,160 and actinomycin D;161 chlorpromazine's tranquilizing effect;162 and the mood-elevating effect of MAO-inhibitor163 and tricyclic antidepressants164 were all discovered through clinical observation of side effects.

5. Other Non-Animal Methods

In vitro cell and tissue cultures are powerful investigative tools. Between the mid-1950s and mid-1980s, the NCI screened 400,000 chemicals as possible anti-cancer agents, mostly on mice who had been given mouse leukemia.165 The few compounds that were effective against mouse leukemia had little effect on the major human cancer killers.166

More recently, researchers have favored grafting human cancers onto animals with impaired immune systems that do not reject grafts. However, few drugs found promising in these models have been clinically effective, and drugs with known effectiveness often fail to show efficacy with these models.167 More promising and less costly is a screen of about 60 in vitro human cancer cell lines, a much less costly and more reliable alternative.168 Similarly, in vitro tests using cells with human DNA can detect DNA damage much more readily than animal tests.169

Regarding vaccines, in 1949 researchers discovered that vaccines made from human tissue cultures were more effective, safer, and less expensive than monkey tissue vaccines,170,171 completely avoiding the serious danger of animal virus contamination.172 Likewise, many animal tests for viral vaccine safety have been replaced by far more sensitive and reliable cell culture techniques.173,174

Antibodies have broad research and clinical applications. Researchers use millions of animals to produce antibodies by techniques that cause great suffering. Despite the ready availability of inexpensive in vitro methods, many researchers (who claim to use animals "only when necessary") don't bother to use the humane alternative.175

Mathematical models using human clinical data are another source of information that is more reliable than data derived from animal studies.176 Mathematical models use human clinical and epidemiological data to generate hypotheses about complex disease processes. For example, a mathematical model has indicated that there are two distinct types of breast cancer--one very malignant, the other much less so--that look alike under the microscope. This model suggests that the more malignant form requires early diagnosis and aggressive treatment, while excision is likely curative in the less malignant form.177

continue to Why Vivisection Persists

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