Lung cancer rising, but not from smoking

Exposure to PM2.5 suspected, though proof requires more study, experts say

Chinese health authorities are trying to figure out the reason for the rapid rise in a form of lung cancer that develops deep in the lung and is not associated with smoking.

China has seen a sharp increase in the disease over the past 10 to 15 years, hitting groups traditionally not susceptible such as women and nonsmokers, said Xue Qi, deputy director of thoracic surgery at the Cancer Hospital Chinese Academy of Medical Sciences, also the country's National Cancer Institute.