More Coventry patients come forward over unnecessary chemotherapy

The firm has reported Prof Brown to the General Medical Council, Ms Tinsley added.

He is now under interim restrictions, with conditions on his ability to practise and cannot prescribe, administer, or have primary responsibility for any chemotherapy drugs pending a full investigation.

“This could be the tip of the iceberg”, she said.

“I don’t think this is an isolated incident.

“It’s my understanding from my communication with the trust that there is a cohort of patients impacted having taken long term temozolomide.”

The trust has declined to answer any further questions, which it said would be dealt with as part of the internal review.

Prof Hardy said: “We take very seriously any allegation that care provided by a member of staff, past or present, may have fallen below the standards we would expect for our patients.

“I can confirm we are undertaking an internal review of this matter and, once completed, will consider what further steps may be necessary.

“As our review is ongoing, it would be inappropriate to comment further at this stage.”

The BBC has attempted to contact Prof Brown for comment.