No association between green tea and the risk of gastric cancer: pooled analysis of two prospective studies in Japan.

Introduction Although green tea shows protective effects against gastric cancer in laboratory experiments and most of eight case-control studies, none of the five prospective studies found a significant inverse association (1–6). Furthermore, no prospective studies have examined the association between green tea and gastric cancer by anatomical subsite or histological subtype. We conducted pooled analysis of two population-based prospective cohort studies in rural northern Japan. We reported null results from one of the two cohorts elsewhere (5).