Cancer Organizations: W
- W. L. Gore and Associates, Incorporated
- WEX Pharmaceuticals Incorporated
- WHO Melanoma Programme
- WVVA Health Care Alliance, PC at Greenbrier Oncology Clinic
- Wabash County Hospital
- Waccamaw Community Hospital
- Waccamaw Oncology
- Waco Cancer Care
- Waco Family Practice Center
- Waco Hematology Oncology Associates, PA
- Wadley Cancer Treatment Center at Wadley Regional Medial Center
- Wadsworth Cancer Center
- Wageningen University
- Wagner and Associates Plastic and Reconstructive Surgery Consultants of Indiana
- Waikato Hospital
- Wakayama Medical University
- Wake Forest University Baptist Medical Center
- Wake Forest University CCOP Research Base
- Wake Forest University Comprehensive Cancer Center
- Wake Forest University Physicians Comprehensive Cancer Center
- Wake Radiology Oncology Services, PLLC
- Wake Research Associates
- Wake Urological Associates
- WakeMed Health & Hospitals - Raleigh Campus
- WakeMed Cary Hospital
- Wakefield Clinic
- Waldorf Dermatology & Laser Associates, PC
- Wales Cancer Trials Unit
- Wales Gene Park
- Walker Cancer Care Center at Walker Baptist Medical Center
- Walker Cancer Treatment Center at Samaritan Medical Center
- Walla Walla General Hospital
- Wallace Thomson Hospital
- Wallace Wilson Brailsford Clinic
- Walsall Manor Hospital
- Walsgrave Hospital
- Walsh Cancer Clinic, PC
- Walter Reed Army Institute of Research
- Walter Reed Army Medical Center
- Walter and Eliza Hall Institute of Medical Research
- Walther Cancer Institute
- Walton Centre for Neurology and Neurosurgery
- Walton General Hospital
- Wansbeck General Hospital
- Warner Cancer Treatment Center
- Warnie Finnell Oncology Center at Bradley Memorial Hospital
- Warren Grant Magnuson Clinical Center - NCI Clinical Trials Referral Office
- Warren Hospital
- Warren Medical Center
- Warrington Hospital NHS Trust
- Warsaw School of Medicine
- Warwick Hospital
- Warwick Medical School Clinical Trials Unit
- Wasatch Urology Associates
- Washington Adventist Hospital
- Washington Cancer Institute at Washington Hospital Center
- Washington County Hospital Association
- Washington County Regional Medical Center
- Washington Hematology-Oncology Specialists
- Washington Hospital Cancer Center
- Washington Internal Medicine Group
- Washington Oncology-Hematology Center, PC - Chevy Chase
- Washington Oncology-Hematology Center, PC - Washington, D.C.
- Washington Radiology Associates, PC
- Washington Regional Medical Center
- Washington Stanford Radiation Oncology Center
- Washington Township Hospital
- Washington Urological Associates
- Watanabe Naika Clinic
- Waterbury Hospital Health Center
- Waterford Regional Hospital
- Waterlandziekenhuis
- Watertown Memorial Hospital
- Watford General Hospital
- Waukesha Memorial Hospital Regional Cancer Center
- Waupun Memorial Hospital
- Wausau Family Practice Center
- Wausau Hospital
- Wausau Medical Center
- Waverly Hematology Oncology
- Wayne A. Christopherson, M.D. and Associates
- Wayne D. Kuni and Joan E. Kuni Foundation
- Wayne Hospital
- Wayne Memorial Hospital
- Wayne Memorial Hospital, Incorporated
- Wayne Radiation Oncology
- Wayne State University-Institute of Environmental Health Sciences
- Waynesboro Hospital
- Weber Medical Clinic, Limited
- Weeks Medical Center
- Weill Cornell Breast Center
- Weinstein Imaging Associates
- Weir Ear, Nose and Throat Associates
- Weisberg Cancer Treatment Center
- Weisseritztal-Kliniken GmbH
- Welborn Clinic
- Welcare Hospital
- Welch Cancer Center at Sheridan Memorial Hospital
- Weleda AG
- Well Group Health Partners