It is true because gastric cancer prevalence in China is much higher than in the US. China: about 100,000 per year; US: about 15,000. Liver cancer in China: 300,000 per year; US: 15,000. However, liver cancer has different causes. Gastric cancer prevalence is pretty high in Japan as well. It is believed that high-salt, preserved food, even sushi rice are the main culprit. Just be careful out there.