Cornelia de Lange syndrome

Disease Description (Causes and Symptoms)

• Name clarification: This disease is medically commonly referred to as "carcinoid syndrome."
• Definition/Cause: This is a condition in which neuroendocrine tumors (NETs, carcinoid tumors) arising in the small intestine, appendix, rectum, pancreas, lungs, and other sites excessively secrete biologically active substances such as serotonin, bradykinin, and histamine, causing systemic symptoms. Symptoms usually occur when the substances bypass hepatic metabolism (first-pass metabolism), such as with liver metastasis or a primary pulmonary lesion.
• Pathophysiology summary: Serotonin and other substances secreted by the tumor cause vasodilation, increased intestinal motility, bronchoconstriction, and fibrosis around the heart valves. When the tumor originates in the gastrointestinal tract, systemic symptoms commonly occur only when liver metastasis is present.
• Main symptoms: Sudden facial and chest flushing, recurrent diarrhea (mucoid), abdominal pain, bronchoconstriction (asthma-like symptoms), enlargement of the extremities (hands and feet), fatigue and weight loss, fever, skin lesions, erectile dysfunction, and decreased libido. It may cause carcinoid heart disease (mainly pulmonary and tricuspid valve abnormalities on the right side of the heart) and carcinoid crisis (severe hemodynamic instability and bronchospasm).
• Prevalence/Epidemiology: This is a rare disease, and many reports indicate that it is more common in people aged 50 or older. Common sites of origin include the small intestine (especially the ileum), appendix, rectum, and lungs.

Treatment Methods and Precautions

• Symptom control (basic)
  • Somatostatin analogs (SSA): Octreotide and lanreotide are used as first-line treatments and effectively suppress flushing, diarrhea, and asthma symptoms; they may also inhibit tumor growth in some patients.
  • Treatment of carcinoid crisis: Intravenous (IV) octreotide bolus followed by continuous infusion and supportive treatment (hemodynamic support, bronchodilators, etc.).
  • Telotristat ethyl: Reduces diarrhea by inhibiting tryptophan hydroxylase in patients whose diarrhea is not controlled with SSA.
• Curative/Tumor treatment
  • Surgical resection: Surgical removal of the primary lesion and, when possible, metastatic lesions is the cornerstone of curative treatment. Partial or extensive resection is determined according to the size of the primary tumor and whether metastasis is present.
  • When liver metastasis is present: Hepatectomy, local ablation or resection, hepatic artery embolization, or hepatic artery chemoembolization may be used to relieve symptoms and reduce tumor burden.
  • Peptide receptor radionuclide therapy (PRRT): Targeted radiotherapy such as 177Lu-DOTATATE is used for somatostatin receptor-positive tumors and is effective in advanced disease or when systemic treatment has failed.
  • Systemic chemotherapy: Streptozocin-based chemotherapy, temozolomide ± capecitabine, and other chemotherapy may be considered for high-grade or rapidly progressing NETs.
  • Targeted and immunotherapy: Everolimus and other treatments may be considered depending on the primary site and degree of differentiation.
• Management of carcinoid heart disease
  • Symptom control and treatment of heart failure (ACE inhibitors/ARBs, diuretics, etc.); severe valvular disease may require valve replacement or surgical correction.
• Lifestyle management and precautions
  • Patients should be advised to avoid triggers for attacks (alcohol, stress, strenuous exercise, certain foods—including amine-rich foods such as cheese, processed meat, bananas, avocados, tomatoes, and alcoholic beverages—and some medications).
  • Octreotide prophylaxis should be administered before invasive procedures such as surgery or endoscopy (to prevent carcinoid crisis).
  • Long-term monitoring is required (hormonal markers, imaging studies, echocardiography, etc.).

Outpatient Visit Checkpoints (Including Preparations and Example Questions)

• Items/preparations
  • A list of all medications currently being taken (including prescription drugs, OTC medications, and supplements)
  • Past medical history and surgical records, and pathology reports (the pathology report if a carcinoid tumor was diagnosed)
  • Results of previous tests (CT/MRI, nuclear medicine/PET, echocardiography) or CDs and image files
  • Symptom diary: Frequency and duration of flushing, triggers, frequency and characteristics of diarrhea, respiratory symptoms, weight changes, etc.
  • 24-hour urine 5-HIAA collection (if instructed to undergo the test): Certain foods (bananas, walnuts, pineapple, avocados, tomatoes, cheese, citrus fruits, etc.) and medications (including aspirin? and some other medications) must be avoided for several days before the test — confirm the instructions with the attending physician before the test.
  • Allergy and contraindication information (medications, iodinated contrast media, etc.)
• Points to inform the medical staff of in advance during an outpatient visit
  • Whether symptoms such as flushing or diarrhea have recently worsened and what triggers them
  • Whether surgery or a procedure is scheduled soon (e.g., dental treatment, endoscopy, etc.)
  • Whether there are plans for pregnancy or whether the patient is breastfeeding

Examples of General Questions to Ask the Doctor

• "What blood, urine, and imaging tests are recommended to confirm this diagnosis?"
• "What are the effects and common side effects of the medication you prescribed, such as octreotide?"
• "Is a cure possible with surgery, and how high is the risk of recurrence?"
• "Are there any foods or medications I should avoid in daily life?"
• "What should be prepared to prevent carcinoid crisis before surgery or a procedure?"

Examples of Disease-Specific Questions

• "What is the meaning of my 24-hour urine 5-HIAA result (or Chromogranin A level), and how often should it be monitored?"
• "If I have liver metastasis, what treatment options are recommended for me (hepatectomy, embolization, PRRT, etc.), and what are their expected effects and side effects?"
• (Additional) "If cardiac symptoms are suspected, when should an echocardiogram be performed, and what are the indications for valve surgery?"

Additional guidance: Instructions regarding food and medication restrictions before testing and prophylactic administration of octreotide during procedures may vary depending on the hospital and testing method, so be sure to confirm the instructions with the outpatient physician in charge or the laboratory.