Pure red cell aplasia

Graft-versus-host disease (Graft‑versus-host disease, GVHD)

1) Disease Description (Causes and Symptoms)

• Cause/pathophysiology: After an allogeneic (from another person) hematopoietic stem cell transplant (or, rarely, a blood transfusion), mature donor T lymphocytes recognize the patient's (host's) tissues as non-self and trigger an immune response. Cytotoxicity and cytokine secretion by donor T cells cause damage to target organs such as the skin, liver, and gastrointestinal tract. It is generally classified as acute GVHD when it occurs within 100 days after the procedure and chronic GVHD when it occurs after 100 days.
• Major target organs: Skin (rash, possibly becoming pustular), liver (jaundice, elevated liver enzyme levels), gastrointestinal tract (nausea, vomiting, loss of appetite, abdominal pain, diarrhea), and infections caused by impaired immune function (e.g., CMV reactivation).
• Summary of common symptoms: Rash (commonly occurring on the auricles, palms, and soles), itching/redness, epidermal peeling and blisters in severe cases, jaundice and abnormal liver function, recurrent and severe diarrhea and abdominal pain, generalized weakness, and fever.

2) Treatment Methods and Precautions

• Initial/standard treatment
  • First-line: Systemic high-dose steroids (e.g., prednisone) — used to relieve symptoms during the acute phase.
  • For steroid-refractory disease or long-term treatment: Additional or alternative immunosuppressants (cyclosporine, tacrolimus), immunosuppressive drugs with anticancer properties (e.g., methotrexate, mycophenolate), biologic agents (e.g., anti-IL-2 receptor agents), or JAK inhibitors, which have increasingly been used in recent cases.
• Topical treatment
  • Skin lesions: Moisturization, topical steroids, and infection-prevention care.
  • Gastrointestinal symptoms: Electrolyte replacement and nutritional management; hospitalization and consideration of parenteral nutrition in severe cases.
• Prevention of complications and infections
  • Immunosuppressive treatment increases the risk of opportunistic infections → Antiviral/antifungal/antibacterial prophylaxis and active monitoring are necessary (e.g., CMV PCR monitoring).
  • Vaccination may be limited depending on immune status (live vaccines are particularly contraindicated).
• Lifestyle management and precautions
  • In case of emergency signs such as fever, sudden severe diarrhea (especially bloody diarrhea), difficulty breathing, or rapidly worsening jaundice, visit a medical institution immediately.
  • When the skin is damaged, take care to prevent wound infections; hygiene and skin moisturization are important.
  • During long-term steroid use, monitoring for side effects such as osteoporosis, hyperglycemia, and gastrointestinal complications is necessary.

3) Checkpoints Before an Outpatient Visit (Items to Prepare and Information to Collect) — Including Example Questions

• Items/materials to prepare or submit
  • Transplant-related information: Transplant date, donor information (whether related by blood and HLA matching status), type of transplant (type of allogeneic hematopoietic stem cell transplant), and a list of prophylactic immunosuppressants used before and after transplantation.
  • Medication list: All medications currently being taken (including prophylactic medications), recent steroid dose, and tapering history.
  • Recent test results: CBC, liver function tests (AST/ALT/bilirubin), electrolytes, CMV PCR, and others.
  • Symptom records: When symptoms began, their progression (skin photographs if available), the frequency and amount of diarrhea, weight changes, and whether fever is present.
• Materials to show the doctor during the outpatient visit
  • Photographs of skin lesions (at onset and during progression), a bowel movement diary (frequency, color, and presence of mucus/blood), and medication and allergy records.
• Example questions to check before the outpatient visit
  • "When and how did the symptoms begin?"
  • "Which immunosuppressants, including steroids, are you taking, and at what doses?"
  • "Do you have the results of any recent tests, such as liver enzyme levels, CBC, or CMV tests?"

4) Examples of General Questions to Ask the Doctor

• "How do you determine whether my current condition is acute or chronic?"
• "What is the recommended standard treatment, and what side effects can be expected?"
• "When can the immunosuppressant, such as steroids, be reduced?"
• "Which tests should I undergo regularly to prevent infections?"
• "What should I be careful about in daily life, such as diet, exercise, and vaccinations?"

5) Examples of Disease-Specific Questions (1–2)

• "What is the degree of HLA matching for the transplant I received, and how high is the risk of GVHD recurrence resulting from it?"
• "If steroid-refractory GVHD is suspected, what alternative treatment options, such as JAK inhibitors or cell therapy, are available, and what are their expected benefits and risks?"

Additional information: Rapid diagnosis and immediate treatment are important for the prognosis of acute GVHD. Because immunosuppressive treatment carries a risk of infection, regular testing and infection monitoring, particularly for CMV, should be performed together.