l-Asparaginase, in the dose of ≥6000 IU/sq m three times weekly, was demonstrated to be an effective agent in reinduction of remissions in childhood leukemia.

Four hundred thirteen children with acute lymphocytic leukemia were treated with l-asparaginase. Doses i.m. ranged from 300 to 12,000 IU/sq m. None of the patients had received prior asparaginase therapy. 6-Mercaptopurine was given p.o. concurrently. All of the patients had experienced several previous relapses, and their disease was not responsive to 6-mercaptopurine. l-Asparaginase was found to be effective in reinducing remissions at the following rates: 9.5% for 300 IU/sq m; 35.1% for 3,000 IU/sq m; 53.5% for 6,000 IU/sq m; and 62.5% for 12,000 IU/sq m. The drug was given three times weekly for four weeks. Hypersensitivity reactions occurred in 6.5% of patients.

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Childrens Cancer Study Group investigators, institutions, and grant numbers are given in “Appendix.” Address requests for reprints to Childrens Cancer Study Group Operations Office, 1721 Griffin Avenue, Los Angeles, Calif. 90031.

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