I. General Topics -- 1. History of Flow Cytometry -- 2. Basic Principles -- 3. Sample-Data Analysis -- . II. Intraoperative Flow Cytometry -- 4. Basic Principles -- 5. Sample - Data Analysis -- . III. Intraoperative Flow Cytometry in CNS malignancies -- 6. Pathology of the Tumors of the Central Nervous System -- 7. Current methods for intraoperative application -- 8. IFC in Gliomas -- 9. IFC in Meningiomas -- 10. IFC in Pediatric Tumors -- 11. IFC in Spine Tumors -- . IV. Intraoperative Flow Cytometry in Breast malignancies -- 12. Breast Cancer -- 13. Current methods for intraoperative application -- 14. IFC in Lumpectomy -- . V. Intraoperative Flow Cytometry in Head and Neck malignancies -- 15. Head and Neck malignancies -- 16. Current Techniques for intraoperative application -- 17. IFC in Head and Neck malignancies -- . VI. Intraoperative Flow Cytometry in Gastrointestinal malignancies -- 18. Gastrointestinal Malignancies -- 19. Current methods for intraoperative application -- 20. IFC in liver cancer -- 21. IFC in Colorectal Cancer -- 22. Future Perspectives of IFC.