11.   It has been used in many previous gene therapy trials.

12.   Jesse was especially interested in the gene trial since it promised dramatic improvement.

13.   Last year, a modified virus designed for that purpose killed a volunteer in a gene therapy trial.

14.   Nor does it necessarily mean an end to gene therapy clinical trials at the university.

15.   The biotechnology company conducted eight unsuccessful gene therapy trials for cystic fibrosis.

16.   The clinical gene therapy trials are to test a method aimed at growing new blood vessels to bypass arterial blockages in the heart or the leg.

17.   The Food and Drug Administration, the main enforcement agency on human drug tests, stopped that experiment and a similar gene therapy trial.

18.   The Food and Drug Administration, whose approval is required for gene therapy trials, agreed.

19.   The Food and Drug Administration last spring halted all six gene therapy trials that Isner was conducting, citing a long list of alleged violations of patient protection rules.

20.   With the uptick in gene therapy trials, the government continues to impose tighter regulations.