One possible explanation is that "a more rapid regrowth occurs when you stop Avastin, " he says.
The results were spectacular - in one instance 14mm of nerve regrowth was produced.
Other research has shown that lens injury can promote nerve regrowth in these sorts of injury.
This suggests that the same signals that trigger the fat expansion will also trigger hair regrowth.
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One question: Why would regrowth in the hippocampus reverse depression, when the ailment also affects many other areas of the brain?
People with severe hair loss typically turn to dermatologists for medicinal treatment such as Minoxidil, an active ingredient in Rogaine, for hair regrowth.
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Genentech is now testing in mice whether its lung cancer drug Tarceva can spur nerve regrowth, following positive preliminary findings published last month by Harvard researchers.
While it is possible that a seizure can signal the regrowth of the original tumor a thought that surely crossed many people's minds some experts caution against leaping to that conclusion.
When the regrowth was removed, they vanished again.
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It suggests that doctors must have determined there was no evidence on brain scans that Kennedy is suffering from an obvious regrowth of the brain tumor, called a glioblastoma, that caused his first seizure last May.
Dr. Walter Koroshetz, deputy director of the National Institute of Neurological Disorders and Stroke, says that these days doctors will perform scans on patients with prior brain tumors every couple of months to check for early evidence of regrowth.
Dr James Fawcett, from the Cambridge Centre for Brain Repair, says that any successful attempt to produce nerve regrowth in humans would probably depend on a combination of treatments, both aimed at breaking down scar tissue and encouraging nerves to sprout.
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