EGFR and non-small cell lung carcinoma: The impact of ethnicity, and also possibly environmental factors, clearly emerges from a relevant study conducted on 2146 NSCLC in Southwest China: in the rural Qujing area, the incidence of compound EGFR mutations was 43.6% compared to 10.4% in the non-Qujing region (p < 0.0001), with patients’ occupation (farmer vs. non-farmer) being independently associated with an increased rate of EGFR compound mutations [12].