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The evidence presented last week suggested this is not the case. But at week's end AIDS researchers were stressing that the study was terminated too soon to learn if the drug prolongs life for more than just a few months or if it has any serious long-term side effects. And they were confident that AZT is not the ultimate weapon against AIDS, that other, more effective drugs will come along. "This is not the end of the story," says Jerome Groopman. "It's exciting to have a drug that appears to benefit patients with AIDS, but there's a lot more work that has to be done."