American Cancer Society (ACS)
ACS is a nationwide, community-based health organazation.

American Society of Clinical Oncology (ASCO)
Oncologist-approved cancer information site from the American Society of Clinical Oncology. Read about GI cancer from ASCO.

Colon Cancer Alliance
A non-profit organization dedicated to patient support, advocacy, and education

Carcinoid Cancer Foundation, Inc.
A non-profit organization supporting research and education on carcinoid tumors and related neuroendocrine tumors.

National Cancer Institute
The NCI is part of the National Institutes of Health and the Department of Health and Human Services. They supporting cancer research; training physicians and scientists; and disseminating information about cancer detection, diagnosis, treatment, prevention, control, palliative care, and survivorship.