Cancer Organizations: A
- A & A Pain Institute of St. Louis
- A & G Dermatological Associates, Limited
- A Medical Corporation
- A. Alfred Taubman Health Care Center at University of Michigan Medical Center
- A. Perrino Hospital
- A. oe. Krankenhaus der Barmherzigen Schwestern Kinderabteilung
- A. oe. Landeskrankenhaus Abt. fuer Kinderkrankheiten
- A.Gvamichava National Center of Cancer
- A.O. Fox Memorial Hospital
- A.P. Pharma, Incorporated
- A.o. Bezirkskrankenhaus Kufstein
- AAIPharma
- AAMC Breast Center
- ABC Children's Health Center
- ABC Medical Center
- ABHM Associates
- ACE Research Specialists, LLC
- AESCA Pharma Ges.m.b.H.
- AFLAC Cancer Center and Blood Disorders Service of Children's Healthcare of Atlanta - Egleston Campus
- AFLAC Cancer Center and Blood Disorders Service of Children's Healthcare of Atlanta - Scottish Rite Campus
- AGENSIS Unternehmensberatung
- AGIRx Limited
- AGO Ovarian Cancer Study Group
- AIDS Associated Malignancies Clinical Trials Consortium
- AIDS Clinical Trials Group
- ALZA Corporation
- AM-Pharma
- AMAG Pharmaceuticals, Incorporated
- AMC Cancer Research Center
- AMDeC Foundation, Incorporated
- AMI Clinic
- AML-BFM Trial Centre at Hannover Medical School
- ANDROS Mannenkliniek
- ANZ Breast Cancer Trials Group
- AO Foundation
- AOI Pharmaceuticals, Incorporated
- AOSpine North America
- APN-IMPATH Research Corporation
- ARIAD Pharmaceuticals, Incorporated
- ART Advanced Research Technologies Incorporated
- ARTAC
- ASL NO. 1 Imperiese
- AVAX Technologies, Incorporated
- AVEO Pharmaceuticals, Incorporated
- AVI BioPharma
- AZ Damiaan
- AZ Groeninge - Oncologisch Centrum
- AZ Klina
- AZ Maria Middelares
- AZ Nikolaas - Sint-Niklaas
- AZ Sint Lucas
- AZ Sint-Jan
- AZ Volkskliniek
- AZ Zusters Van Barmhartigheid
- Aalborg Hospital
- Aalesund Hospital
- Aarhus Universitetshospital - Aarhus Sygehus
- Aastrom Biosciences Incorporated
- Abant Izzet Baysal University
- Abben Cancer Center at Spencer Hospital
- Abbott Japan Company, Limited
- Abbott Laboratories
- Aberdeen Royal Infirmary
- Abide Dermatology Clinic
- Abilene Diagnostic Clinic Surgical Associates
- Abilene Hematology Oncology Group, PA
- Abilene Regional Medical Center
- Abington Hematology Oncology Associates, Incorporated - Meadowbrook
- Abington Hematology Oncology Associates, Incorporated - Willow Grove
- Abiogen Pharma S.p.A.
- Abramson Cancer Center of the University of Pennsylvania
- Abrass and Conrath Hematology - Oncology
- Abraxis Bioscience
- Abraxis Oncology
- Abt. Innere Medizin Onkologic
- Academia Nacional de Medicina
- Academic Associates of Michigan
- Academic College of Tel Aviv-Jaffa
- Academic Dermatology Associates
- Academic Hospital
- Academisch Medisch Centrum at University of Amsterdam
- Academisch Ziekenhuis Maastricht
- Academisch Ziekenhuis der Vrije Universiteit Brussel
- Academy Health Center Departments at University of Minnesota
- Acadiana Neurosurgery
- Acceleron Pharma, Incorporated
- Accentia Biopharmaceuticals
- Access Clinical Research
- AccuMed Research Associates
- Accuray, Incorporated - Worldwide Headquarters
- AcelRx Pharmaceuticals, Incorporated
- Acharya Harihar Regional Cancer Centre
- Acharya Tulsi Regional Cancer Treatment and Research Institute
- Acibaden Kozyatagi Hospital
- Action Cancer
- Active Biotech
- Adachi Kyousei Hospital
- Adair County Memorial Hospital
- Adams Cancer Center
- Addenbrooke's Hospital