• RTICC (Red Temática de Investigación Cooperativa en Cáncer)
• Servicio de Oncología Médica de Salamanca
• Sidney Kimmel Comprehensive Cancer Center at Johns Hopkins
• Oncolink (Abramson Cancer Center of the University of Pennsylvania)
• IARC (International Agency for Research on Cancer)
• UICC (International Union Against Cancer)
• Cancer Research UK
• Clinical Trials Help
• MD Anderson Cancer Center
• The Cancer Letter