All of the 10 most expensive paid search keywords are related to mesothelioma, a cancerous tumor that is at the center of many asbestos-related lawsuits, according to recent paid search stats from Adgooroo.

Long-tail keywords referring to mesothelioma attorneys in specific states, plus general structured settlement keywords, are the priciest Google desktop search ads based on average cost-per-click (CPC), the analysis of January through June 2015 ad spend data found.

"Mesothelioma attorneys TX" is the most expensive search keyword, on average ($272 CPC), followed by "mesothelioma attorneys Maryland" ($262).

The high cost of these keywords is the result of competitive bidding, according to the report.

For mesothelioma-related keywords, attorneys set high bids in Google AdWords because they stand to receive large sums of money when a plaintiff in a lawsuit gains a favorable judgment or settlement.