Cancer Organizations: C
- Corpus Christi Cancer Center
- Corvallis Clinic
- Coserics, LLC
- Coshocton County Memorial Hospital
- Cosmetique - Dermatology, Laser & Plastic Surgery, LLP - Long Island
- Cosmo Bioscience
- Cottage Hospital
- Cotton-O'Neil Cancer Center
- Cottonwood Hospital Medical Center
- Cougar Biotechnology, Incorporated
- Coulter Pharmaceutical, Incorporated
- Countess of Chester Hospital
- Country Hospital
- County Hospital
- County of Los Angeles Harbor-UCLA Medical Center
- Covance
- Covenant Cancer Treatment Center
- Covenant Children's Hospital
- Covenant Clinic - Cedar Falls
- Covenant Clinic - Waterloo
- Covenant Medical Center
- Covidence GmbH
- Covington MultiCare Clinic
- Cox Medical Center North
- Cox Radiation Oncology at Hulston Cancer Center
- Craig Hospital
- Craigavon Area Hospital
- Craniofacial Tissue Engineering
- Cranley Clinic
- Cranley Surgical Associates, Incorporated - Monfort Heights
- Craven Regional Medical Center
- Creighton Area Health Services
- Creighton University Medical Center
- Crestview Cancer Care Center
- Creticos Cancer Center at Advocate Illinois Masonic Medical Center
- CritiTech, Incorporated
- Crittenton Hospital Medical Center
- Crittenton Radiation Oncology Center
- Croll GmbH
- Cromwell Hospital
- Cross Cancer Institute at University of Alberta
- Cross Roads Cancer Center
- Crosshouse Hospital
- Crossroads Radiation Therapy Center
- Crouse Hospital
- Crozer-Chester Medical Center
- Cryobanks International, Incorporated
- Crystal Plastic Surgeons, Incorporated
- Crystal Run Healthcare, LLP
- Csongrad County Counsil's Hospital for Chest Diseases
- Cukurova University School of Medicine
- Cullen Research and Consulting
- Cullman Oncology and Hematology
- Cullman Regional Medical Center
- Cumberland Hematology and Oncology - Oak Ridge
- Cumberland Infirmary
- CuraGen Corporation
- CuraTrial SMO & Research
- Cure Tech Limited
- Curie Manavata Cancer Centre
- Curis, Incorporated
- Curtis Cancer Center
- Curtis and Elizabeth Anderson Cancer Institute at Memorial Health University Medical Center
- Cutter Biological Miles Inc.
- Cvitkovic & Associes Consultants S.A.
- CyberKnife Centers of San Diego - Central San Diego
- Cyclacel Pharmaceuticals, Incorporated
- Cyfair Cancer Center
- Cylene Pharmaceuticals
- Cytavis BioPharma GmbH
- Cytheris, Incorporated
- Cyto Pulse Sciences, Incorporated
- CytoCore, Incorporated
- Cytogen Corporation
- Cytokinetics, Incorporated
- Cytopia Research Pty Limited
- Cytori Therapeutics, Incorporated
- Cytos Biotechnology AG
- Cytotech ApS
- Cytran Incorporated