Elevated risk of lung cancer among asian American females who have never smoked: an emerging cancer disparity.

Lung cancer is a leading cause of cancer mortality for most ethnic groups of Asian American females, including Chinese, Korean, Japanese, and Vietnamese Americans, a striking pattern given the exceedingly low prevalence of smoking among Asian American females in the general population. Recent research demonstrates that among Asian American females diagnosed with lung cancer, the vast majority of patients have never smoked, as high as > 80% among Chinese and Asian Indian American females. Despite declining rates in lung cancer overall in the United States, rates among Asian American females who have never smoked appear to be increasing. This Commentary articulates extant knowledge, based on studies in Asia, of a range of risk factors such as a family history of lung cancer, history of lung diseases including tuberculosis and chronic obstructive pulmonary diseases, exposure to cooking fumes and second-hand smoke, and various putative risk factors. Unique mutational profiles at the tumor level, including higher prevalence of EGFR mutations among Asian populations, highlight the importance of tumor genomic testing of newly-diagnosed patients. Additional research is essential, given the high burden of disease among Asian American females who have never smoked, and limited knowledge regarding contributing risk factors specific to Asian American females, as the risk factors identified in Asians living in Asia may not apply.