Dr Nicholas van As

Medical Director and Consultant Clinical Oncologist MBBCH MRCP FRCR MD(res)

Specialism: Urology

Available at: Chelsea, Kingston

Special interests:

  • prostate cancer
  • CyberKnife, SBRT
  • radiotherapy (IMRT, IGRT)
  • systemic therapy for prostate cancer


Dr Nicholas van As is Medical Director of The Royal Marsden. He has been a Consultant Clinical Oncologist in the Urology Unit in the hospital since September 2004, and has also recently been appointed Associate Honorary Faculty and Team Leader at The Institute of Cancer Research.

Dr van As qualified in medicine in South Africa, and completed specialist training in clinical oncology at Guy's and St Thomas' Hospital, The Royal Marsden, and The Institute of Cancer Research. Dr van As is clinical lead for stereotactic body radiotherapy (SBRT) and CyberKnife. He is also Co-Chair of the UK SBRT Consortium and national clinical lead for NHS England's Commissioning through Evaluation Programme for SBRT.

Dr van As is the chief investigator for the PACE trial, an international, randomized, controlled trial comparing SBRT to image-guided radiotherapy and surgery for treating prostate cancer. Dr van As' main research interests are in stereotactic and image-guided radiotherapy, risk prediction in early prostate cancer, and functional magnetic resonance imaging. He has published numerous papers on these subjects and delivered presentations at international meetings.

Clinical units