Study reveals why some colorectal cancers respond better to immunotherapy

A subset of cancers, known as microsatellite instability (MSI) and deficient DNA mismatch repair (dMMR) cancers, are more visible to the immune system than others.

Because their DNA repair systems are defective, these tumors are more likely to be recognized and attacked by immune cells and tend to respond better to immunotherapy.

But scientists do not fully understand why. ...