Here is a collection of clinical trail links that may also be useful to you in your reseach of this subject:

American College of Surgeons Oncology Group (ACOS-OG)
CancerNet Search for Clinical Trials (PDQ)
CancerTrials (NCI site)
Cancer Therapy Evaluation Program (CTEP)
Center for Drug Evaluation and Research (CDER): Drug Information
CenterWatch Clinical Trials Listing Service
Children's Oncology Group
Clinical Trials and Noteworthy Treatments for Brain Tumors
CureSearch
Eastern Cooperative Oncology Group (ECOG)
European Organization for Research and Treatment of Cancer (EORTC)
Gynecologic Oncology Group (GOG)
National Cancer Institute of Canada Clinical Trials Group (NCIC CTG)
National Surgical Adjuvant Breast and Bowel Project (NSABP)
National Wilms Tumor Study Group (NWTSG)
North Central Cancer Treatment Group (NCCTG)
PhRMA: America's Pharmaceutical Companies
Radiation Therapy Oncology Group (RTOG)
Search the Studies (NIH)
Southwest Oncology Group (SWOG)
USC/Norris Comprehensive Cancer Center and Hospital
US TOO International, Inc.