CancerSource adheres to the Health on the Net principles when posting cancer-related health information. Editorial content is developed or obtained from a variety of sources to meet the needs of CancerSource users. Once developed or obtained, the content undergoes an internal and external review process of health care professionals with expertise in the content area and CancerSource staff prior to posting the content. Much of this material has been peer-reviewed or previously published. All content is dated and the source clearly posted. The content undergoes an annual review process to ensure its accuracy and that it remains current and relevant.