Immune Biomarker Study for Head and Neck Cancer

This is an observational study. Consequently, study participation does not alter the therapy of the treated disease. Blood will be drawn from patients at several time points during and after radiotherapy (RT) and therapy with immune checkpoint inhibitor (ICI) for detailed immunomonitoring of the patients. In addition, faeces and sputum of the patients for microbiomic and metabolomic measures will be collected. Whenever possible, adequate tissue samples are taken from the center of the tumor and a biopsy is taken from the edge of the tumor including the adjacent mucosa in the nearby area without affecting the pathological assessment (study group). Blood, faeces and sputum will be taken from patients of the control group prior to surgery. After surgery, only blood will be taken.