Alex Berenson

Insider trading is hard to prove. To be convicted, a person must have bought or sold a stock based on material information that is both unknown to the general public and likely to have had an important effect on a company's stock price.

Because Genentech is a leading developer of cancer therapies, some doctors also fear that the company's pricing plans for Avastin - around $8,800 a month - may encourage other companies to charge more for their own oncology drugs.

Every time I see documentaries or infomercials about little kids with cancer, I just freak out. It affects me on the highest emotional level... Anytime I think about it, it makes me sadder than anything I can think of.