Peek Richard M, a gastroenterologist from Vanderbilt University, had most Np and the highest H-index and TC, and had devoted himself to the study of HP, especially the tumorigenesis and pathobiology of HP-induced GC such as activation of β-catenin, virulence factors, innate immunity, microRNAs, iron deficiency and regulation of p53 (Peek et al., 2010; Polk and Peek, 2010; Wei et al., 2010; Wroblewski et al., 2010; Noto et al., 2013; Amieva and Peek, 2016). This evidence concerns the gene TP53 and Iron deficiency anemia.