Mary Lei

Consultant clinical oncologist


Mary Lei has been a consultant clinical oncologist specialising in the treatment of head and neck and thyroid tumours at Guy's and St Thomas' NHS Foundation Trust since 2011. Currently, she is the lead for the clinical oncology radiotherapy research and development group and also leads research and development for the network thyroid cancer team.

Mary undertook her undergraduate medical training at King's College London School of Medicine and Dentistry and completed specialist training in clinical oncology at Imperial College Healthcare and Guy's and St Thomas' NHS Foundation Trusts. 

Mary spent 2 years as a research fellow in the Royal Surrey County Hospital and University of Surrey. Her research focused on image-guided intensity modulated radiotherapy (IMRT) in head and neck cancer and culminated in the award of a Medical Doctorate (MD) postgraduate degree. She was then appointed to a 1-year charity funded IMRT fellowship in head and neck cancer at Guy's and St Thomas' NHS Foundation Trust.

During her training, she was the chair of the oncology trainee forum, representing the interests of clinical oncology trainees across the UK at the Royal College of Radiologists. She continues to be active in developing clinical oncology training in addition to roles as an educational and clinical supervisor.

Education and training

  • MD, University of Surrey, 2013
  • Fellow of Royal College of Radiologists (FRCR) (UK), 2007
  • Membership of the Royal Colleges of Physicians (MRCP) (UK), 2003
  • Bachelor of medicine, bachelor of surgery (MBBS), King's College School of Medicine and Dentistry, University of London, 2000

Research interests

  • Novel systemic therapies
  • Novel radiotherapy technology
  • Predictive biomarkers of disease

Last updated: January 2023

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