Monomethoxypolyethylene glycol (PEG) was attached covalently to arginase. PEG-arginase was effective in prolonging the survival times of mice injected with the Taper liver tumor, whereas unmodified arginase was ineffective. PEG-arginase was more effective than arginase in the in vitro destruction of L5178Y mouse leukemia. However, neither PEG-arginase nor arginase inhibited the in vivo growth of this tumor.
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