Definition

The National Cancer Institute’s Cancer Information Service (CIS) provides cancer-related information to the public, free of charge. CIS staff provide personalized responses to questions in easy-to-understand language. Help with quitting smoking is also available. Contact CIS by calling 1-800-4-CANCER (1-800-422-6237), or by using the LiveHelp instant-messaging service at https://livehelp.cancer.gov. Also called CIS.