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A widely used and inexpensive type 2 diabetes drug, once hoped to hold enormous promise in treating breast cancer, does not prevent or stop the spread of the most common forms of the disease, according to new research.

The study, which has yet to be peer-reviewed, was led by Toronto researchers and run by the under the umbrella of the network. It is the largest study of its kind to date, tracking more than 3,600 breast cancer patients from across Canada, the U.S., Switzerland and the U.K.

Pamela Goodwin (photo courtesy of Sinai Health)

The randomized, double-blind trial enrolled patients who were treated with two pills a day of either placebo or the diabetes drug metformin. Overall, researchers found the addition of metformin to standard breast cancer treatments did not improve outcomes in the two most common types of breast cancer, hormone receptor-positive or negative.

“The results tell us that metformin is not effective against the most common types of breast cancer and any off-label use of this drug for the treatment of these common types of breast cancer should be stopped,” said Pamela Goodwin, a professor in the at the University of Toronto’s , who also is a medical oncologist at and a clinician scientist at the .

Goodwin presented the findings this week at the 2021 . 

While metformin was found not to be effective in treating the most common forms of breast cancer, Goodwin said the trial found a potentially important result for individuals with a less common but aggressive form of the disease called HER2-positive breast cancer.

For this subtype of breast cancer, researchers found there was evidence that use of metformin for five years might lead to a reduction in deaths. HER2-positive cancer makes up about 20 per cent of all breast cancers.

“Metformin is not beneficial for use in most common breast cancers, but in the cases of HER2 positive breast cancer, our findings suggest it may be beneficial,” said Goodwin, who is also a professor in the at the .

“These results need to be replicated in future research before metformin is used as a breast cancer treatment, however, it could provide an additional treatment option for HER2-positive breast cancer,” said Goodwin.

Metformin belongs to a class of drugs called biguanides, which are used to treat high blood sugar or diabetes. Previous observational and pre-clinical studies suggested metformin may also reduce the risk of development and increase survival of some cancers, including breast cancer.

It was theorized the drug may slow breast cancer growth by improving patient metabolism, notably insulin levels, leading to reduced growth of cancer cells, or that it might impact cancer cells directly.

The results have been submitted for publication. A potential next step will be to prospectively test the impact of metformin in patients with HER2-positive breast cancer in a randomized clinical trial. 

The multinational trial involved a large team of scientists including Goodwin and Vuk Stambolic, a professor of at ����TV and at senior scientist at the , University Health Network.

Professors Wendy Parulekar and Bingshu Chen of and the Canadian Cancer Trials Group were also involved with the study.

The research was funded by the Canadian Cancer Society Research Institute, National Cancer Institute (U.S.), Canadian Breast Cancer Foundation, Breast Cancer Research Foundation, Cancer Research UK, Hold’Em for Life Charity Challenge and Apotex (Canada).