Cancer Information Service

What the Cancer Information Service (CIS) is

The Cancer Information Service (CIS) is a free and confidential program run by the National Cancer Institute (NCI). It is designed to help anyone affected by cancer—including patients, family members, caregivers, health professionals, and researchers—find clear, reliable information about cancer. CIS staff are trained information specialists who provide personalized answers to questions about cancer types, symptoms, risk factors, prevention, screening, treatment options, clinical trials, and living with cancer. They use easy-to-understand language to help make complex cancer information less overwhelming.

Why CIS matters in cancer care

Cancer can be confusing and scary, and it’s common to have many questions about diagnosis, treatment, and what to expect. CIS offers a trusted place to get accurate information and support. For example, if you want to understand your diagnosis better, explore treatment choices, or learn about ways to reduce your cancer risk, CIS can help. They also provide specialized help for people who want to quit smoking, recognizing that quitting is difficult and offering counseling to manage cravings and triggers. Having access to clear information can help you feel more confident and prepared when talking with your healthcare team.

How you might use CIS

You can contact CIS by calling 1-800-4-CANCER (1-800-422-6237) or by using the live chat service on the NCI website during business hours, Monday through Friday, 9 a.m. to 9 p.m. Eastern Time. The service is available in English and Spanish. When you reach out, a trained specialist will listen to your questions and provide answers based on the latest cancer research and guidelines. They can also guide you to other helpful resources or programs. CIS is often mentioned in cancer education materials, websites, or by healthcare providers as a reliable source of information.

What CIS does not do

It’s important to know that CIS provides general cancer information and support but does not give medical diagnoses, make treatment decisions, or offer personalized medical advice. CIS is not a substitute for your doctor’s care. Always discuss any information you receive from CIS with your healthcare provider to understand how it applies to your specific situation. CIS complements your medical care by helping you better understand your condition and prepare questions for your care team.

Next steps and safety

If you or a loved one is facing cancer or wants to learn more about cancer prevention and care, reaching out to the Cancer Information Service can be a helpful first step. Using CIS can help you feel more informed and supported as you navigate cancer-related questions and decisions. Remember that while CIS is a trusted educational resource, it cannot replace your healthcare provider’s advice. Always talk with your doctor before making any changes to your treatment or care plan.