Correction to " Type II human epidermal growth factor receptor heterogeneity is a poor prognosticator for type II human epidermal growth factor receptor-positive gastric cancer" World J Clin Cases 2019; 7(15): 1964-1977. In this article, one of the affiliation of the first author was lacked. Akio Kaito, the first author, belonged to Course of Advanced Clinical Research of Cancer, Juntendo University Graduate School of Medicine, Tokyo 163-8001, Japan.