Part 1: Neurologic complications of systemic therapies: According to agent: 1. Alkylating agents; 2. Antimetabolites 3. Plant Alkaloids; 4. Topoisomerase inhibitors; 5. Epothilones; 6. Amino acid degraders; 7. Corticosteroids; 8. Immunomodulatory agents; 9. Immunosuppressants; 10. Biologic Agents; 11. Targeted Therapies; 12. Hormonal therapies; 13. Supportive therapies; According to adverse event: 14. Cognitive function; 15. Central nervous system complications (except cognitive dysfunction); 16. Peripheral nervous system complications (excluding muscle and NMJ disorders); 17. Neuromuscular junction and myopathy; Part 2: Neurologic complications of radiation therapy: 18. Mechanisms of radiation damage; 19. Early CNS complications; 20. Late-delayed CNS complications; 21. Radiation-induced tumors; 22. Radiation vasculopathy; 23. Spinal cord damage; 24. Peripheral nerve damage; Part 3: Neurologic complications of surgery: 25. Surgery; Part 4: Neurologic complications of hematopoietic stem cell transplantation: 26. Hematopoietic stem cell transplantation