Hello, all you grammar gurus and word mavens. I need some clarification on word usage. Background: We have a new VP who is on our case about typos. A doctor came into his office today, complaining about a typo on the front of an old Breast Center brochure. He says there's a typo in the headline. The VP agrees. We say it isn't a typo. It's correct. The headline reads: Every woman is at risk of breast cancer. He thinks it should be: Every woman is at risk for breast cancer. Who is right? And why (any grammar rules)? I say they can both be used. Any and all help would be appreciated. I've looked in the Stylebook and a grammar guide and I can't find anything. Many thanks for your help!