In addition, the incidence of EGFR-TKI-associated ILD appears comparatively higher in Asians than in Caucasians, as demonstrated in two large, multi-institutional studies reporting its incidence in Japan at 3.5–4.0% [5, 6], as compared with that of 0.3% in the U.S. [7]. The gene discussed is EGFR; the disease is interstitial lung disease.