Recently, Professor Dong Zigang has proposed a new theory of tumor Etiology and Prevention, and his research result “Cancer Etiology and Prevention Principle: 1 + X” has been published in Cancer Research, which is a journal of the American Association for Cancer Research (AACR), one of the top journals in the field of Cancer Research in the world. Professor Dong Zigang is the corresponding author of the paper, and associate researcher Liu Hui, a member of the research team of Zhengzhou University, is the first author of the paper.