There were two primary reasons for lack of tissue EGFR test results for NSCLC patients, namely, failure to obtain adequate biopsy sample due to advanced age of patients or aggressive disease in 37.5% of cases (6/16) and failure to obtain informative EGFR test results from collected biopsies for 62.5% of cases (10/16). This evidence concerns the gene EGFR and non-small cell lung carcinoma.