Karolinska Institutet Jun 15 2026 A type of white blood cell in the immune system, known as neutrophils, can make cancer immunotherapy less effective. This is shown in a new study from Karolinska Institutet published in the journal Immunity . The results show that a signaling molecule in the tumor affects neutrophils, reducing the effect of treatment. Immunotherapy is used to activate the body's own immune system against cancer, but not all patients respond to the treatment. In the new study,