Cancer Organizations: M
- Mount Sinai School of Medicine
- Mount Stuart Hospital
- Mount Vernon Cancer Centre at Mount Vernon Hospital
- Mount Vernon Cancer Institute
- Mount Vernon Hospital
- Mount Vernon Urological Associates, LLC
- Mountain Radiation Oncology, PA
- Mountain Regional Cancer Centers - Murphy
- Mountain Regional Cancer Centers - Sylva
- Mountain States Tumor Institute - Meridian
- Mountain States Tumor Institute at St. Luke's
- Mountain States Tumor Institute at St. Luke's Regional Medical Center
- Mountain View Hospital
- Mountainside Hospital Cancer Center
- Mountainview Medical
- Mowery Clinic, LLC
- Mroz-Baier Breast Care Center
- Mt. Sinai Comprehensive Breast Center
- Mt. Sinai Medical Center
- Mt. Sterling Cancer Treatment Center
- Mt. Timpanogos Women's Health Care
- Muenchner Studienzentrum am Klinikum rechts der Isar
- Muhlenberg Regional Medical Center
- Mulago Hospital
- Muljibhai Patel Urological Hospital
- MultiCare Regional Cancer Center - Gig Harbor
- MultiCare Regional Cancer Center at Tacoma General Hospital
- MultiSpecialty Clinical Research
- Multidisciplinary Association for Psychedelic Studies
- Mulvane Family Medcenter
- Mundipharma International Limited
- Munich Oncologic Practice at Elisenhof
- Municipal Clinical Hospital No. 33 n.a. Ostroumov
- Municipal Clinical Hospital No.1
- Municipal Complex of Ludwigshafen
- Municipal Hospital Complex
- Municipal Hospital Complex
- Municipal Hospital Complex
- Municipal Hospital Complex Zwickau
- Municipal Hospital Complex of the University
- Municipal Hospital Munich
- Municipal Hospital Munich Schwarbing
- Municipal Hospital No. 40
- Municipal Oncological Dispensary
- Municipal Oncological Hospital No. 62
- Munroe Regional Medical Center
- Munson Cancer Center at Texoma Medical Center
- Munson Medical Center
- Murmansk Health Administration
- Murray Valley Private Hospital and Cancer Treatment Centre
- Musculoskeletal Transplant Foundation
- Musgrove Park Hospital
- Muskogee Regional Cancer Center at Muskogee Regional Medical Center
- Mustamae Hospital
- Myeloproliferative Disorders Research Consortium
- Myriad Pharmaceuticals, Incorporated
- Myrtue Medical Center
