Cancer: Answers About L-Asparaginase

Among almost a dozen chemicals which have a selective damaging effect on cancer cells, L-asparaginase is unique in one respect: its action is so much more selective that it appears to do no harm whatever to normal cells. Since L-asparaginase was erroneously reported to have cured a case of childhood leukemia (TIME, April 14; July 7), researchers have been trying to answer three main questions: 1) Against what types of cancer is it effective?; 2) Will a laboratory test show in advance whether a particular patient's disease will respond?; and 3) Even...

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