| cancer411.org | Cancer411 |
| cancer.gov | NCI: Clinical Trials Search |
| coh.org | City of Hope: Clinical Trials Online |
| cancertrialshelp.org | Coalition of National Cancer Cooperative Groups |
| cancerguide.org | CancerGuide: Finding Clinical Trials on the Net |
| canceranswers.org | Clinical Trials Matching System |
| cancerportfolio.org | International Cancer Research Portfolio |
| canceradvisors.org | Cancer Advisors: Clinical Trial Matching |
| centerwatch.com | CenterWatch Clinical Trials Listing Service |
| ascent-2.com | Ascent-2: Prostate Cancer Clinical Trial |
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