Dr Jason Lester is a Consultant Clinical Oncologist based at The Velindre Cancer Centre in Cardiff.

Dr Lester qualified from Guy's Hospital Medical School, London in 1993 and trained in general medicine in the South East of England. He completed his oncological training in 2003, and was appointed as a Consultant Oncologist at Velindre Cancer Centre the same year, where he is currently Deputy Clinical Director and Lead Clinican for lung cancer in the Trust, bringing vast experience and expertise and offering specialist cancer diagnosis and treatment.

He advises patients on all aspects of Non-surgical treatment of lung cancer, mesothelioma and urological cancers (prostate, kidney and bladder cancer); Chemotherapy and targeted therapy for lung and urological cancers; Stereotactic radiotherapy for early lung cancer; Combined modality therapy for locally advanced lung cancer; Brachytherapy for prostate cancer; IMRT / IGRT radiotherapy for prostate cancer; Bladder sparing treatment for bladder cancer. He is responsible for prescribing and supervising the administration of radiotherapy, radioisotope treatment, cytotoxic chemotherapy and hormone therapy. He is also the Clinical Lead for the All Wales Prostate Cancer Brachytherapy service based at Velindre Cancer Centre. 

Dr Lester is a member of Royal College of Physicians, Fellow of the Royal College of Radiologists, Honorary Research Fellow, Cardiff School of Medicine and British Thoracic Oncology Group Committee Member. He also manages The Stepping Stones Appeal, the Wales-based lung cancer research fund.