EGFR and neoplasm: In two studies of Japanese patients, Yatabe et al. [51] (Table 1) and Shimizu et al. [52] (Table 1) analysed, respectively, 77 and 70 primary tumours and corresponding lymph node metastases, and found EGFR mutation status concordance to be 100 % (77/77) and 86 % (60/70).