The price of cancer drugs has doubled in the past decade, with the average brand-name cancer drug in the U.S. costing $10,000 for a month's supply, up from $5,000 in 2003, according to a new report by IMS Institute for Healthcare Informatics, a health information, services and technology company. And those are just average prices; some drugs may cost as much as $30,000 a month. In Europe, where governments negotiate for national discounts, the list prices of cancer drugs are at least 20 to 40 percent lower than in the U.S., the report found.