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Cachexia is rare in nude mice bearing human malignant tumors even when the transplanted tumors become as large as the body size of the host. In our series on heterotransplantation of a variety of human malignant tumors into nude mice, a malignant melanoma (SEKI) was found to induce severe body weight loss in the host at the early stage of transplantation. There was no electrolyte disturbance, hyper- or hypoadrenocorticism, hyperthyroidism, or destruction of cells of vital organs to account for the weight loss. Moreover, no evidence was obtained for concomitant infection with bacteria, Mycoplasma or fungi. These cachectic mice revealed remarkably increased levels of serum sialyltransferase and decreased liver catalase activity. The removal of tumor tissues from these mice resulted in prompt recovery of body weight, serum sialyltransferase, and liver catalase activity within 1 to 2 weeks. On the basis of the results obtained, the SEKI melanoma was thought to have produced a pathophysiological state in host nude mice which was very similar to that of cachexia in cancer patients. Nude mice bearing transplants of SEKI melanoma may provide a useful system for the study of cancer cachexia in humans.
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