MKI67 and neoplasm: The percentage of Ki67-positive cells in cases of the common, drug-induced, Hp infection-induced, metaplastic, atrophic hyperplasia, and low-grade and high-grade neoplasia of epithelial cells was 1~7%, 11~19%, 14~21%, 9~32%, 18~34%, 26~35%, and 32~40%, respectively (Table 2).