Control of a human tumour (ewing sarcoma) in mice by a single lethal dose of dimethyl-myleran and bone marrow

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Abstract
A Ewing sarcoma grown in immunosuppressed mice was eradicated with a single lethal dose of dimethylmy-leran (DMM) followed by autologous or syngeneic bone marrow. Sarcomas treated 2 weeks after grafting in a phase of rapid proliferation disappeared and large sarcomas treated after 6 or 10 weeks were reduced to necrotic tissue. A human osteosarcoma also regressed distinctly after this therapy while a human colon carcinoma responded poorly. Sub-lethal DMM treatment induced complete remissions in only 62% of the mice. Tumours which display sensitivity in this model may be treated clinically with lethal doses of DMM and autologous marrow transplantions.