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American Journal of Pathology, Vol 136, 95-102, Copyright © 1990 by American Society for Investigative Pathology

REGULAR ARTICLES

Regional growth of different human melanomas as metastases in the brain of nude mice

G Schackert, JE Price, RD Zhang, CD Bucana, K Itoh and IJ Fidler
Department of Cell Biology, University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030.

Cells from eight different human melanomas and two murine melanomas were injected into the internal carotid artery of anesthetized nude mice. Although all were injected by the same route, particular melanomas produced lesions in different regions of the brain. Two melanoma cell lines isolated originally from brain metastases in patients produced metastases predominantly in the brain parenchyma. In contrast, melanoma cells from subcutaneous or lymph node metastases produced more lesions in the meninges, choroid plexus, and ventricles than in the brain parenchyma. All of the melanomas grew in the brain after a direct intracerebral injection. The pattern of brain metastasis did not correlate with tumorigenicity per se or with the ability of the melanomas to grow in the lungs of nude mice. Two mouse melanomas showed different patterns of experimental metastasis after internal carotid artery injection, with one growing predominantly in the parenchyma and the other more frequently in the meninges and choroid plexus. The growth pattern of human melanoma metastasis in the brain of T cell- deficient nude mice suggests that it is determined by properties unique to each tumor interacting with the host's organ microenvironment.


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Copyright © 1990 by the American Society for Investigative Pathology.