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Chromosome studies were done on 7 patients with chronic T cell leukemia. Their lymphocytes responded in culture to one or more T cell mitogens: PHA, Con A, or the calcium ionophore A23187. Clones of cytogenetically-abnormal cells were present in all seven patients, but on occasion the frequency of such cells varied greatly in cultures stimulated with different mitogens. There was no consistent chromosome change, but alterations of chromosome 2 were noted in four individuals and of chromosome 14 in three. In two patients, there was a translocation to the long arm of chromosome 14, producing a 14q+, with the break point in the terminal portion, an abnormality previously observed in B cell lymphomas. One of these patients also showed evidence of clonal evolution in sequential cytogenetic studies, but more data are needed to determine whether such investigations are of prognostic value with respect to the clinical course of the disease.
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