Competitive survival/proliferation of normal and Ph1‐positive haemopoietic cells

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Abstract
Summary: Bone marrow (BM) cells from 10 patients with Ph1‐positive chronic granulocytic leukaemia (CGL) were placed in long‐term cultures in the presence of fetal calf serum (FCS) and horse serum (HoS), or in the presence of human AB serum. The long‐term cultures were started with three different cell combinations: (1) CGL BM cells (four cases), (2) CGL BM cells + normal BM cells (1:1 ratio) from an HLA identical sex‐matched sibling (five cases), (3) CGL BM cells + normal BM cells (1:1 ratio) from an HLA identical sex mismatched sibling (five cases). Cytogenetic studies were performed at weeks 0, 3, 4 and 5 of culture. The results of this study can be summarized as follows: (a) Ph1‐positive cells could be detected at any time of culture in all three of the described cell combinations; (b) a population of Ph1‐negative cells of patient origin could be detected after 3–5 weeks of culture; (c) there was a trend for a better survival of Ph1‐negative cells in cultures supplemented with FCS + HoS and, conversely, of Ph1‐positive cells in cultures containing human serum. These results warrant further studies on the possibility of manipulating survival and proliferation of normal and leukaemic cells by varying the culture conditions.

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