To more efficiently treat breast cancer, scientists have been researching molecules that selectively bind to cancer cells and deliver a substance that can kill the tumour cells, for several years.

Researchers from the University and University Hospital Basel have now for the first time successfully combined such an antibody-drug conjugate with a therapy that stimulates the immune system to attack tumour cells.

This opens the door to new therapeutic options in the treatment of breast cancer, report the researchers in the scientific journal Science Translational Medicine.

In nearly every fifth breast cancer patient, an above-average number of HER2 receptors are located on the surface of the tumour cells.

These receptors are molecules that send growth factor signals into the cell.

The overabundance of receptors causes the cancer cells to divide rapidly and the tumour grows faster than average.

For some years now, a new class of drugs called antibody-drug conjugates (ADCs) have been used, which work in two ways: they consist of an antibody that binds selectively to the tumour cell receptor and interrupts the signal to propagate; they also act as a transport vehicle for a chemical substance that enters the cancer cells with the antibody and triggers their death.

The researchers demonstrate that the use of specific cytotoxic substances can also have a beneficial effect on the body’s immune system.

Combination with immunotherapy

Researchers, led by Prof. Alfred Zippelius at the Department of Biomedicine, from the University and University Hospital Basel have now gone one step further: in a pre-clinical study performed in mouse breast cancer models, they combined the ADC ‘trastuzumab emtansine’ with an additional immunotherapy that activates the immune system into attacking tumours more efficiently.

They focused on what is known as immunoregulatory checkpoints.

These are receptors on immune cells, which control for example effector T-cells by dampening their activation if damage to healthy cells is imminent.

By administering a complementary antibody, they blocked the function of two such immune checkpoints, whereby different types of endogenous T-cells were activated.

On its own, this immune response had no immediate effect in the fight against the utilised breast tumours, but in combination with the ADC it proved itself effective in attacking cancer cells in mice, resulting in the complete cure of the majority of mice receiving the combination therapy.

The researchers were also able to further demonstrate that regulatory T-cells play a host protective role in this therapeutic setting.

Their removal resulted in excessive inflammation and tissue damage.

“Our results clearly demonstrate that antibody-drug conjugates are suitable for use in a combination therapy, opening new perspectives for the treatment of breast cancer,” says lead author Dr. Philipp Müller on the significance of the study.

Source: Universität Basel