http://dtp.nci.nih.gov/branches/btb/tumor-catalog.pdf
Since the early 1960s, DCTD has maintained this low-temperature repository, which holds transplantable in vivo-derived tumors and in vitro-established tumor cell lines from an assortment of species. The repository serves as a resource for viable, contaminant-free experimental tumor lines, many of which are not obtainable elsewhere.
Researchers can access these materials under a material transfer agreement.