Lab study reveals a weakness in cancer cells that survive chemotherapy

Researchers at Trinity College Dublin have uncovered a survival mechanism in cancer cells that withstand chemotherapy. In laboratory experiments using human cells, they also found compounds that selectively killed cells left in a non-dividing, “zombie-like” state.

The study, published in Science Advances and led by Seamus Martin and Gokhan Gunay, focused on proteins known as IAPs. These proteins block signals that prompt damaged cells to self-destruct. When chemotherapy damages a cancer cell’s DNA, IAPs can interrupt that response, allowing the cell to survive.

Some surviving cells enter a state called senescence: they stop dividing but remain active. They release inflammatory signals that draw in immune cells and can encourage wound-healing processes. Tumours can exploit those repair processes to help them recover after treatment.

The researchers found that these senescent cells depended heavily on IAPs to stay alive. Compounds that blocked the proteins switched the self-destruct signals back on, selectively eliminating the cells.

That points to a possible strategy: following chemotherapy with a treatment that targets this survival mechanism. It is a promising direction for further research, rather than an established treatment. The findings are experimental, and this study has not demonstrated benefits for patients.