Neuroblastoma

Disease Description (Causes and Symptoms)

• Definition·pathophysiology: Neuroblastoma is a pediatric cancer caused by malignant transformation of sympathetic nervous system precursor cells (neuroblasts) derived from the neural crest during embryonic development. It mainly develops in the adrenal medulla or sympathetic ganglia around the spine, and tumor cells may secrete catecholamines, resulting in elevated urinary VMA/HVA. Among genetic factors, N-myc amplification is associated with a poor prognosis.
• Causes: The exact cause is unknown, but reports suggest that it may be associated with chromosomal abnormalities (e.g., chromosomal abnormalities reported in some cases), prenatal environmental factors, and other factors.
• Main symptoms (vary depending on the site of occurrence and whether metastasis is present):
  • Abdominal mass, abdominal distension, weight loss
  • Edema of the lower extremities, scrotum, face, or limbs (venous compression)
  • Tachycardia, sweating, facial flushing, hypertension (related to catecholamine secretion)
  • Shortness of breath (thoracic tumor or superior vena cava syndrome)
  • Pain or difficulty walking (bone metastasis)
  • Paraplegia and urinary or fecal dysfunction in cases of spinal cord compression
  • Rarely, spontaneous regression (observed in infants)

Treatment Methods (Standard Treatment·Self-Care·Precautions)

• Summary of tests needed for diagnosis and staging:
  • Blood and urine tests (urinary VMA/HVA), serum NSE
  • Imaging tests: CT, MRI, MIBG scan (radioactive iodine-labeled microparticle examination), and PET-CT if necessary
  • Biopsy (pathology) and bone marrow examination (to confirm bone marrow infiltration)
• Standard treatment (applied differently according to risk and stage):
  • Localized stage (low risk): Surgery (with the goal of complete resection) and observation
  • Intermediate/high risk: Surgery + multi-agent chemotherapy (including induction therapy for local tumor reduction) + radiation therapy (if necessary) + autologous hematopoietic stem cell transplantation (for high-risk groups) + targeted and immunotherapy (e.g., anti-GD2 immunotherapy and retinoids as maintenance therapy)
  • Metastatic or recurrent lesions: Consider MIBG therapy (radioisotope therapy) and clinical trials (targeted therapy·immunotherapy)
• Medications and procedure-related treatments: Chemotherapy (combination therapy), radiation therapy, autologous hematopoietic stem cell transplantation, immunotherapy (anti-GD2), high-dose MIBG therapy, etc.
• Lifestyle management and precautions:
  • Infection prevention (be alert for neutropenia during chemotherapy), oral and skin care, nutritional management (nutritional supplementation in cases of weight loss)
  • Management of catecholamine-related symptoms such as hypertension and tachycardia (control of blood pressure and heart rate in emergencies)
  • Immediate emergency evaluation if spinal cord compression is suspected (to prevent neurological deterioration)
  • Long-term follow-up is needed for long-term complications (hearing loss, cardiotoxicity, growth and endocrine problems, reduced fertility, etc.)
• Risk of complications: Bone marrow and bone metastasis, spinal cord compression, neurological sequelae, treatment-related toxicity (infection, hearing loss, cardiotoxicity), paraneoplastic syndromes (e.g., opsoclonus-myoclonus)

Checklist Before an Outpatient Visit (Including Example Questions)

• Items to prepare (to bring to the hospital):
  • List of currently used medications (prescription and nonprescription medicines and supplements)
  • Previous test results (imaging, blood and urine tests, pathology reports) and surgery/hospitalization records
  • Records of symptom changes (fever, pain, changes in weight or appetite, shortness of breath, changes in urination or bowel movements, etc.)
  • Family and past medical history (especially information related to hereditary diseases and congenital abnormalities)
• Items to explain to the doctor in advance during the outpatient visit:
  • Recent weight changes and whether fever, sweating, tachycardia, or abnormal blood pressure has occurred
  • Location, intensity, and presence or absence of pain (especially nighttime pain and walking problems)
  • Neurological symptoms (weakness of the limbs, sensory abnormalities, urinary or fecal dysfunction)
• Example questions to check before the visit:
  • Do you have the files or reports from recently performed imaging tests (CT/MRI/MIBG)?
  • Do you have the results of recent urinary VMA/HVA and serum NSE tests?

Examples of General Questions to Ask the Doctor

• "What are my current stage and risk group, and what is the standard treatment plan?"
• "What are the expected effects and major side effects of the recommended treatment?"
• "How will long-term complications from treatment (hearing, heart, growth, fertility, etc.) be managed?"
• "How should I respond if an emergency such as infection or bleeding occurs during chemotherapy?"
• "What is the schedule for follow-up tests and what items will be monitored after treatment?"

Examples of Disease-Specific Questions

• "Has my tumor been found to have N‑myc gene amplification, and how will this result affect the treatment plan?"
• "If the MIBG result is positive, can MIBG therapy (radioisotope therapy) be used? What are the eligibility requirements, expected effects, and side effects?"

If symptoms requiring immediate emergency medical care occur, such as decreased consciousness, severe shortness of breath, sudden motor weakness or paralysis affecting urination or bowel movements, or uncontrollable hypertension or tachycardia, you should visit the emergency room.