- CDH1 c-160a promotor polymorphism is not associated with risk of stomach cancer. Pharoah, P.D., Oliveira, C., Machado, J.C., Keller, G., Vogelsang, H., Laux, H., Becker, K.F., Hahn, H., Paproski, S.M., Brown, L.A., Caldas, C., Huntsman, D. Int. J. Cancer (2002)