- Polymorphisms of two fucosyltransferase genes (Lewis and Secretor genes) involving type I Lewis antigens are associated with the presence of anti-Helicobacter pylori IgG antibody. Ikehara, Y., Nishihara, S., Yasutomi, H., Kitamura, T., Matsuo, K., Shimizu, N., Inada, K., Kodera, Y., Yamamura, Y., Narimatsu, H., Hamajima, N., Tatematsu, M. Cancer Epidemiol. Biomarkers Prev. (2001)