Studies have shown that recombinant human alpha interferon (rIFN alpha) inhibits the growth of colonies of multipotential stem cells from human bone marrow. This report demonstrates that rIFN alpha inhibits the growth of such colonies from the bone marrow of patients with chronic myelogenous leukemia (CML) to a greater extent than from bone marrow of healthy individuals. It also shows that T lymphocyte colonies subcloned with interleukin 2 (IL-2) from CML mixed colonies were inhibited more by rIFN alpha than were similar colonies subcultured from normal mixed colonies. The report demonstrates that the Ph' chromosome is present in such T cell colonies subcultured from CML mixed colonies. When mixed colonies were grown from CML bone marrow in the presence of rIFN alpha, Ph' negative colonies were observed, whereas no such Ph' negative mixed colonies grew from a similar number of bone marrow cells incubated without rIFN alpha. These observations confirm that T lymphocytes derived from bone marrow stem cells are from the CML clone, and that the inhibition of growth of Ph' positive colonies, by rIFN alpha permits the growth of residual normal stem cells. The disappearance of the Ph-chromosome in subclones of T lymphocytes supports the notion of nonclonal hematopoiesis in patients with CML.
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