03/28/2008 02:45 am ET Updated May 25, 2011

Biotech Firm Says First Human Stem Cell Tests Could Begin This Summer

The first experiments using human embryonic stem cells in human subjects could begin within a few months, the chief executive of biotech Geron said Monday.

At the annual BIO CEO conference in New York, Dr. Thomas Okarma said Geron plans to start embryonic stem-cell studies in humans with spinal cord injuries toward the end of the second quarter. Okarma said the tests would involve up to 40 human patients, while all prior tests involved rats.

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