American Cancer Society is not publicly respected and they are not trustworthy because of their poor reputation and shams. All they are interested is to get your money. Here are just a couple of public record links about them:
http://naturalsociety.com/100-page-report-american-cancer-society-scam/
http://articles.mercola.com/sites/articles/archive/2011/05/24/american-cancer-society--more-interested-in-wealth-than-health.aspx