In most cases, the animals will probably end up dead. But in some experiments the tests will run until the animal dies. Such a case is determining the lethal dose of radiation used in cancer therapy. Although researchers claim that they depend on animal test data to achieve medical advances, we should demand other means of research. The American Medical Association has stated that it believes that research involving animals is essential to maintaining and improving the health of human beings. They point out that all advances in medical science in the 20th century, from antibiotics to organ transplants, has been achieved either directly or indirectly through the use of animals in laboratory experiments. Arguments for animal experimentation may question the morality, necessity, and validity of these studies. The moral issue on animal experimentation concerns the need to protect human life and to improve the quality of life. The gains in human health and well being outweigh the cost in animal suffering (which nonetheless should be kept to a minimum), in this viewpoint. It would be immoral to conduct such tests on humans, and so animals serve as our stand-ins for many kinds of testing and research. Those who support animal testing may care deeply about animals but don't place them on an equal status with humans. Research on animals may be deemed necessary for a variety of reasons: to develop vaccines and treatments and cures for diseases, to ensure that new products are safe to use. Such as making sure that they won't blind us, burn our skin, or even kill us (which did happen in several instances, before product safety testing was required by law); and to help students, especially prospective doctors, veterinarians, and so on, learn their way around a body. Animals do make good research subjects for many purposes and research on them can tell us a great deal about ourselves. Animals are, in many ways, biologically similar to humans and are susceptible to many of the same health problems.