Julius-Maximilians-Universität Würzburg, JMU Sep 16 2025 In almost all solid tumors - i.e. cancers with a solid tissue structure - the detection of tumor cells in the lymph nodes is considered a decisive marker for the progression of the disease. Lymph node involvement has a significant influence on the choice of treatment and the chances of survival for patients. In particular, solid tumors in the breast, on the skin or in the gastrointestinal tract use the lymphatic system as the main route