A hospital cancer unit is being investigated by police after staff said they were being “pressured or bullied” to falsify data relating to patients.
“Inaccuracies” were found with waiting time data relating to cancer treatment at Colchester hospital, the Care Quality Commission (CQC) found.
Patients’ lives may have been put at risk, the hospitals inspector said.
Essex Police said it was looking into whether a “criminal investigation” was needed.
Staff told inspectors they were “pressured or bullied” to change data relating to patients and their treatment to make it seem people were being treated in line with national guidelines, the CQC said.
The findings were reported to police “due to the serious failings identified”, it added.
Dr Gordon Coutts, chief executive at the Colchester Hospital University NHS Foundation Trust, said: “We are truly sorry that in some cases cancer patients, their carers and families have not always received the high quality of care that they should have expected from our trust.”
Professor Sir Mike Richards, chief inspector of hospitals, recommended the trust be put into special measures, which could lead to a new management team being installed or another trust put in charge.
He said: “It is shocking to think that people’s lives may have been put at risk for the sake of the waiting-time figures.”
NHS England said it would lead an incident management team of cancer specialists to ensure the safety of cancer patients at the hospital.
There will also be a review looking back as far as 2010 to check whether any other patients had their records changed or “inappropriately recorded”.
The CQC said its inspectors visited the trust in August and September after receiving complaints about waiting times for cancer treatment.
It said some patients did not get their treatment within the required 62 days and in three cases delays exceeded 100 days.
“Six people described problems experienced in their treatment, including delays in receiving care,” the report said.
“The provider did not have adequate systems to maintain the safety and welfare of cancer patients.”