Dr Alastair Thomson qualified as a doctor after completing his medical training at the University of Southampton in 1996. He gained medical and surgical experience at the Queen Alexandra Hospital (Portsmouth) and Dorchester/West Dorset Hospitals, before completing higher medical qualifications whilst working at Salisbury District Hospital.His specific oncological experience started at Salisbury District Hospital, before he progressed to work in London at the Royal Marsden Hospital. He went on to complete his fellowship in the treatment of cancer whilst based at the Gloucestershire Oncology Centre and Bristol Haematology and Oncology Centre, before becoming a locum Consultant Clinical Oncologist at the Gloucestershire Oncology Centre. He accepted the post of Consultant Clinical Oncologist at the Royal Cornwall Hospital in Truro in 2005.

He treats breast and urological malignancies, with wide ranging research interests including molecular changes in secondary cancer cells, current clinical practice and education.