"The tendency during the campaign has been for Bush not to attack, or, if he was forced to attack, to go back positive as quickly as possible, " one GOP insider told me.

CNN: Stuart Rothenberg: Can Bush win by 'going positive?'

If your cancer is HER2 positive, you may also be given a targeted therapy to attack the protein that's overproduced in these cancers.

CNN: Recurrent breast cancer

Overall risk of death was reduced by 17%, and the risk of a heart attack was reduced by 28%, which seem to be very positive results.

FORBES: Should Everyone Take Statins?

Authorities say they have no reason to believe the suspect letters are related to the bombing attack at the Boston Marathon on Monday, and they noted that false positive tests for ricin are common.

WSJ: Ricin Also Suspected in Letter to Obama