But recent findings suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed.

VOA: special.2009.09.22

But recent findings have suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed.

VOA: special.2009.08.12

So based on some early indications, scientists are projecting that we're actually going to be seeing a tsunami of brain cancer unless we do something to educate people to lower their exposure to this kind of risk."

VOA: special.2011.06.06