Guide to Health Plans Cancer Resources Consumers' CHECKBOOK offers a wide range of health care information. The sites listed below provide useful information to help you understand diseases and available tests and treatments. Oncolink - Information from the University of Pennsylvania Cancer Center. CancerNet - A gateway to recent cancer information from the National Cancer Institute. Resources for Rare Diseases Consumers' CHECKBOOK offers a wide range of health care information. The sites listed below provide useful information to help you understand diseases and available tests and treatments. Office of Rare Diseases - Rare disease section of CancerNet. National Organization for Rare Disorders - Information from this organization, which works toward the prevention, treatment, and cure of rare "orphan" diseases.