Law firm Brabners says it has obtained data, using Freedom of Information requests that shows UHCW spent more than £3.6m on temozolomide between 2009 and 2024 – more than 10 times that of comparable NHS hospitals.
In a statement, UHCW said: "The Trust is committed to providing the safest possible care.
"We have comprehensively reviewed and spoken to all individuals who were receiving temozolomide (TMZ) treatment at the end of 2023 to ensure appropriate support and care plans are in place."
It added: "A high-grade brain tumour is an extremely complex condition and all modes of treatment – surgery, chemotherapy and radiotherapy – carry the risk of complications and side effects.
"National Institute for Health and Care Excellence guidelines recognise that clinicians can exercise professional judgement appropriate to individual circumstances when offering treatment to patients.
"We have commissioned the Royal College of Physicians to conduct an independent review of a representative cohort of patients who received greater than 12 cycles of adjuvant TMZ between 2017 and 2023.
"As this process is ongoing, it would be inappropriate to comment further at this stage."
A statement from the GMC said: "Dr Ian Brown is currently registered with a licence to practise but with interim conditions on his registration pending the conclusion of a GMC investigation.
"The interim restrictions were first imposed on Dr Brown's practice on 23 August 2024."