Excess weight clearly increases the risk of cancer. This information comes from Dr. Walter Willet, who is chair of the School of Public Health at Harvard Medical School. He and colleagues at Harvard are among the leaders worldwide on the importance of proper nutrition.
http://www.union-bulletin.com/local_columnists/studies-show-connection-between-excess-weight-cancer/article_8de97808-3f39-11e8-bccd-831253101843.html
Studies show connection between excess weight, cancer