Graft-Versus-Host Disease (GVHD): Symptoms, Causes, and Treatment

What is Graft-Versus-Host Disease (GVHD)?

Graft-versus-host disease (GVHD) is a serious and potentially life-threatening complication that can occur after certain types of medical treatments, most commonly stem cell or bone marrow transplants. It happens when the donated cells (the graft) recognize the recipient's body (the host) as foreign and attack it. This immune response can damage various organs and tissues, leading to a range of symptoms.

GVHD is classified into two main types:

• Acute GVHD: Typically occurs within the first 100 days after transplant. It often affects the skin, liver, and digestive tract.
• Chronic GVHD: Develops later, usually after 100 days, and can last for months or even years. It may involve multiple organs and can resemble autoimmune diseases.

While GVHD can be a significant challenge, advances in medical care have improved outcomes for many patients. Early detection and treatment are key to managing this condition effectively.

Source: Mayo Clinic, National Cancer Institute (NCI)

Common Causes

GVHD primarily occurs after procedures that involve transferring immune cells from one person to another. The most common causes include:

• Allogeneic stem cell transplant: The most frequent cause, where stem cells are donated by another person (not the patient). The risk is higher if the donor is not a close genetic match.
• Bone marrow transplant: Similar to stem cell transplants, bone marrow transplants from a donor can trigger GVHD if the immune cells in the donated marrow attack the recipient's body.
• Peripheral blood stem cell transplant: Stem cells collected from a donor's bloodstream can also cause GVHD.
• Cord blood transplant: While the risk is lower, stem cells from umbilical cord blood can still lead to GVHD in some cases.
• Haploidentical transplant: Transplants from a half-matched donor (e.g., a parent or child) carry a higher risk of GVHD due to the genetic differences.
• Mismatched donor transplant: When the donor and recipient are not well-matched genetically, the risk of GVHD increases significantly.
• Reduced-intensity conditioning: Some transplants use lower doses of chemotherapy or radiation before the transplant, which can increase GVHD risk because the recipient's immune system is not fully suppressed.
• Donor lymphocyte infusion (DLI): This treatment, used to boost the immune response after a transplant, can sometimes trigger GVHD.
• Solid organ transplants (rare): In very rare cases, GVHD can occur after solid organ transplants (e.g., liver or intestine) if immune cells from the donor are transferred with the organ.
• Blood transfusions (extremely rare): In individuals with severely weakened immune systems, transfusions containing white blood cells can, in rare cases, lead to GVHD.

Source: National Cancer Institute (NCI), Leukemia & Lymphoma Society

Associated Symptoms

The symptoms of GVHD vary depending on whether it is acute or chronic and which organs are affected. Below are the common symptoms associated with each type:

Acute GVHD Symptoms

• Skin:
  • Red or pink rash, often starting on the palms, soles of the feet, ears, or face
  • Itching or burning sensation
  • Peeling or blistering in severe cases
• Digestive Tract:
  • Nausea and vomiting
  • Severe diarrhea (sometimes bloody)
  • Abdominal pain or cramping
  • Loss of appetite
• Liver:
  • Jaundice (yellowing of the skin and eyes)
  • Dark urine
  • Pain or discomfort in the upper right abdomen

Chronic GVHD Symptoms

Chronic GVHD can affect many parts of the body and may include:

• Skin and Nails:
  • Dry, thickened, or tightened skin
  • Skin discoloration (darker or lighter patches)
  • Rash or sores
  • Nail changes, such as ridges, splitting, or loss
• Mouth:
  • Dry mouth or difficulty swallowing
  • Mouth sores or ulcers
  • Sensitivity to spicy or acidic foods
• Eyes:
  • Dry, gritty, or painful eyes
  • Redness or inflammation
  • Light sensitivity
• Lungs:
  • Shortness of breath
  • Chronic cough
  • Wheezing
• Joints and Muscles:
  • Joint pain or stiffness
  • Muscle weakness or cramping
• Genital Area:
  • Dryness, irritation, or sores
  • Pain during intercourse
• General Symptoms:
  • Fatigue
  • Weight loss
  • Fever

Source: Mayo Clinic, National Cancer Institute (NCI)

When to See a Doctor

If you or a loved one has undergone a stem cell or bone marrow transplant, it is crucial to monitor for signs of GVHD closely. Contact your healthcare provider immediately if you experience any of the following:

• A new rash, especially if it spreads quickly or is accompanied by itching or pain.
• Persistent nausea, vomiting, or diarrhea, particularly if there is blood in the stool.
• Yellowing of the skin or eyes (jaundice).
• Severe abdominal pain or cramping.
• Difficulty breathing or persistent cough.
• Unexplained fever or fatigue.
• Mouth sores that make eating or drinking difficult.
• Dry or painful eyes that interfere with vision.

Early intervention can significantly improve outcomes, so do not wait to seek medical advice if you notice any of these symptoms.

Source: American Cancer Society

Diagnosis

Diagnosing GVHD involves a combination of clinical evaluation, laboratory tests, and sometimes biopsies. Here’s how doctors typically approach diagnosis:

Medical History and Physical Exam

• Your doctor will review your transplant history, including the type of transplant, donor match, and any previous episodes of GVHD.
• A thorough physical exam will assess symptoms, particularly focusing on the skin, mouth, eyes, and abdomen.

Laboratory Tests

• Blood tests: These can check liver function (e.g., bilirubin levels), kidney function, and complete blood counts to assess overall health.
• Stool samples: If diarrhea is present, samples may be tested for infections or other causes.

Biopsies

• Skin biopsy: A small sample of affected skin is removed and examined under a microscope to confirm GVHD.
• Liver biopsy: If liver involvement is suspected, a biopsy may be performed to assess damage.
• Gastrointestinal biopsy: An endoscopy or colonoscopy may be used to obtain tissue samples from the digestive tract.

Imaging Tests

• Imaging studies like CT scans or MRIs may be used to evaluate organ damage, particularly in the liver or lungs.

Grading GVHD

Once diagnosed, GVHD is often graded based on severity (mild, moderate, or severe) to guide treatment decisions. Grading considers:

• The extent of skin involvement (e.g., percentage of body surface affected).
• The severity of liver dysfunction (e.g., bilirubin levels).
• The amount of diarrhea or gastrointestinal symptoms.

Source: UpToDate, National Center for Biotechnology Information (NCBI)

Treatment Options

Treatment for GVHD aims to suppress the immune response causing the attack on the body's tissues while minimizing side effects. The approach depends on the type (acute or chronic) and severity of GVHD.

Medical Treatments

First-Line Treatments

• Corticosteroids:
  • Prednisone or methylprednisolone are often the first-line treatments for both acute and chronic GVHD. They work by reducing inflammation and suppressing the immune system.
• Calcineurin Inhibitors:
  • Medications like tacrolimus or cyclosporine are commonly used alongside steroids to prevent or treat GVHD.

Second-Line Treatments

If first-line treatments are ineffective, other options may include:

• Immunosuppressants:
  • Medications like mycophenolate mofetil, sirolimus, or methotrexate may be used to further suppress the immune system.
• Biologic Therapies:
  • Ruxolitinib (Jakafi): A JAK inhibitor approved for steroid-refractory GVHD that helps reduce inflammation.
  • Ibrutinib (Imbruvica): Used for chronic GVHD, particularly when other treatments fail.
• Extracorporeal Photopheresis (ECP):
  • A procedure where blood is treated with ultraviolet light outside the body to reduce GVHD symptoms, particularly in chronic cases.
• Monoclonal Antibodies:
  • Drugs like infliximab or rituximab target specific parts of the immune system to reduce GVHD activity.

Supportive Care

In addition to medical treatments, supportive care is essential to manage symptoms and improve quality of life:

• Skin Care:
  • Use mild, fragrance-free moisturizers to relieve dryness.
  • Avoid hot showers and harsh soaps.
  • Wear loose, soft clothing to reduce irritation.
• Oral Care:
  • Rinse your mouth with salt water or prescribed mouthwashes.
  • Avoid acidic, spicy, or hard foods.
  • Stay hydrated to prevent dry mouth.
• Eye Care:
  • Use artificial tears or prescribed eye drops for dryness.
  • Wear sunglasses to protect against light sensitivity.
• Nutrition:
  • Eat small, frequent meals if nausea or diarrhea is present.
  • Consider a dietitian’s help to ensure adequate nutrition.
• Pain Management:
  • Over-the-counter pain relievers (e.g., acetaminophen) may help with mild pain, but always consult your doctor first.

Emerging Treatments

Research is ongoing to develop new treatments for GVHD, including:

• Mesenchymal Stem Cells (MSCs): These cells may help modulate the immune system and repair damaged tissues.
• New Biologic Agents: Drugs targeting specific immune pathways are being tested in clinical trials.

Source: National Cancer Institute (NCI), National Center for Biotechnology Information (NCBI)

Prevention Tips

While GVHD cannot always be prevented, certain strategies can reduce the risk, especially in the context of stem cell or bone marrow transplants:

• Choose the Right Donor:
  • Opt for a closely matched donor (e.g., a sibling with similar HLA typing) to minimize the risk of GVHD.
  • If a matched sibling is not available, consider a matched unrelated donor or cord blood transplant, which may have a lower risk.
• Pre-Transplant Conditioning:
  • Follow your doctor’s recommended chemotherapy or radiation regimen to suppress your immune system before the transplant.
• Post-Transplant Medications:
  • Take immunosuppressive drugs (e.g., tacrolimus, cyclosporine) as prescribed to prevent GVHD.
  • Do not skip or adjust doses without consulting your healthcare team.
• Monitor for Early Signs:
  • Attend all follow-up appointments and report any new symptoms immediately.
• Infection Prevention:
  • Avoid crowds and people who are sick to reduce infection risk, as immunosuppressants increase vulnerability.
  • Practice good hygiene, including frequent handwashing.
• Lifestyle Adjustments:
  • Eat a balanced diet to support immune function.
  • Stay hydrated and avoid alcohol, which can worsen liver issues.
  • Protect your skin from sun exposure, as GVHD can increase sensitivity.
• Clinical Trials:
  • Consider participating in clinical trials that test new prevention strategies or treatments for GVHD.

Source: Leukemia & Lymphoma Society, American Cancer Society

Emergency Warning Signs

Source: Mayo Clinic, Centers for Disease Control and Prevention (CDC)