EGFR and non-small cell lung carcinoma: The odds ratio (OR) for <i>EGFR</i> mutations between Xuanwei region and non-Xuanwei region was calculated, and the absolute incidence of <i>EGFR</i> mutations in Xuanwei was pooled by mutation subtype.<h4>Results</h4>Seven studies involving 1,355 patients with NSCLC from Yunnan Province (442 in Xuanwei and 913 in other regions) were included.