[Stereotyped chromosome abnormalities in human leukemia and lymphoma]

That chromosomal abnormalities in leukaemias and lymphomas are not non-randomly distributed has been demonstrated by banding techniques. Abnormalities characteristic of a given type of proliferation are described. The chromosomal breakpoints corresponding to these changes are located close to the sequences encoding for cellular oncogens (c-onc), which justifies the growing interest in the cytogenetic study of malignant cells.