Dr Arackal Manu Nair, who it is alleged gave prostate cancer treatment to patients who did not have the disease, is also being investigated by the UK's General Medical Council (GMC), it emerged today.
The consultant urologist is also alleged to have given some patients laser treatment - a high intensity focused ultrasound (HIFU) - which was yet to be approved by the UK's National Institute for Clinical Excellence (Nice).
The GMC has placed a number of restrictions on the doctor's license until July 2017.
The surgeon, who also worked at Spire Hospitals in Solihull, near Birmingham, resigned from the NHS Trust in July 2015.
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"We would like to unreservedly apologise for any distress this has caused," a spokesperson for the trust said.
Lawyers representing former patients are now urging anyone who fears they may have suffered medical negligence to come forward by September 30.
Nair has also appeared on a television show in the UK called 'Embarrassing Bodies' as a medical expert.
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