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Light microscopic observations of transplantable mouse hepatomas.

The origin, histology, generation time, and karyotype of four long-term, stable, transplantable mouse hepatomas are reviewed. All arose as well-differentiated, trabecular, hepatocellular carcinomas and each differentiated in a unique way. Hepatomas BH3 and BNL were induced in BUB mice and have been maintained by serial intrasplenic transplantation since 1959 for 229 and 452 generations, respectively. Hepatomas SS1G and SS1H are sublines of a hepatoma that arose spontaneously in a C3H/StWi mouse in 1949, and they have been maintained by serial s.c. transplantation for 277 and 107 generations, respectively. Hepatoma BNL has a diploid karyotype, hepatoma SS1G is polyploid, and hepatomas BH3 and SS1H each contain two cell lines, one diploid and one polyploid. Neither ploidy nor number and kind of marker chromosomes can be correlated with microscopic characteristics of the hepatomas.