The medical clinic where Rob Ford received treatment for drug and alcohol addiction has a subsidiary that specialized in detection of pre-cancer problems, corporate documents show.

GreeneStone Healthcare’s financial documents show it has received as much as $1.8 million in revenue annually to do colonoscopy and other medical detective work in recent years, with much of that money coming from the provincial health insurance plan.

Whether Ford availed himself of any of that treatment is not known. Ford’s staff have not responded to questions about his treatment over the past few days including Sunday.

After a series of alcohol and drug-fuelled escapades earlier this year Ford entered rehab in early May. The clinic he chose after checking out several others was GreeneStone in Bala, a former resort property now run by Shawn Leon.

GreeneStone offers addiction rehabilitation, executive health care and “gastrointestinal services” that include a medical endoscopy clinic. Endoscopy refers to using an endoscope (small camera) to look inside body cavities for polyps or small tumours. A colonoscopy is a form of endoscopy where a camera on a flexible tube travels through the colon looking for polyps that could become cancerous.

“We strongly recommend a screening colonoscopy to check for colon cancer and to treat colon polyps in order to reduce the potential for cancer,” reads a statement on the GreeneStone website.

Patients going in for addiction rehab, as Ford did in May, are all given an extensive medical to determine if they are fit for the addiction-rehab process which includes being able to withstand the effects of withdrawal.

GreeneStone documents state that all new patients in the rehab program are to be assessed to see if they have any other health issues, including chronic pain. GreeneStone doctors, the documents say, will work to treat those alongside the addiction issues.

Ford emerged from rehab this summer proclaiming he was feeling great, though he has recently said he has been experiencing discomfort for three months, back to when he entered rehab.

Ford announced Wednesday evening that he was under treatment in hospital after experiencing stomach pains. He has had a biopsy at Mt. Sinai Hospital in Toronto and is under the care of a colorectal surgeon with experience in colon and rectal surgery. Ford has a tumour in his abdomen but doctors have said they do not yet know whether it is cancer.

Ford pulled out of the mayor’s race Friday and his brother Doug is running in his place. Rob Ford will run in Ward 2, his old ward, in the October election.

The Star reached out to Leon, president of GreeneStone, but did not receive an answer to questions about Ford’s treatment, including whether or not the clinic did a full examination of the mayor before his treatment began in mid May.

Previously, Leon and a doctor at the clinic had told the Star they were unable to answer any questions about Ford’s treatment. A previous story by the Star revealed Ford was aggressive to other patients and to staff during his time in rehab and also revealed that, according to a source with knowledge of his care, Ford had continued to use drugs and alcohol while there.

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GreeneStone’s corporate filings (it is a U.S.-registered company) show that over the past two years its revenue for both sides of the business has been just under $6 million, with about a third of that coming from the endoscopy business.