The National Cancer Institute
Lots of cancer information, including CancerNet. Huge resource for health care professionals and patients...

American Cancer Society
Cancer information and ACS programs...

Breast Cancer.Net
Cancer news, treatments, list of support groups...

Cancernet
A service of the national cancer institute...

National Library of Medicine
U.S. National Library of Medicine...

National Health Information Center
From a division of the U.S. Department of Health and Human Services, links to federal health information and keyword database search...