Abstract
Cells derived from cell-cell fusion events were clonally isolated from primary methyl-cholanthrene (MCA)-induced tumors in allophenic mice. Compared with non-fused cells isolated from the same cultures, the fused cells had markedly greater experimental metastasizing (lung colonizing) activity, but only slightly greater tumorigenicity and the same cloning efficiency in soft agar. Cell-cell fusion may thus contribute to the generation of tumor heterogeneity that underlies the process of tumor progression.
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