Understanding PAMI Syndrome

If you are reading this, you have likely navigated a long and confusing path to find an answer for the symptoms you or your child are experiencing. PAMI syndrome is an extremely rare genetic autoinflammatory disorder. Unlike an autoimmune disease where the body mistakenly produces antibodies that attack its own tissues, autoinflammation means the innate immune system’s signaling is dysregulated without a clear external trigger like an infection ^[1].

You may have first heard this condition called hyperzincemia and hypercalprotectinemia (HZ/HCP). Medical researchers now use the name PAMI—which stands for PSTPIP1-associated myeloid-related proteinemia inflammatory syndrome—to more accurately reflect the genetic cause and the specific immune cells involved ^[1][2].

Because PAMI is so rare, your local doctor or pediatrician may have never seen a case. In a 2022 systematic review, only 43 cases had been detailed in the medical literature worldwide ^[1]. This means you and your care team are part of a small global community learning about this condition together.

Defining the Core Features of PAMI

PAMI occurs because of a variation (mutation) in the PSTPIP1 gene. This gene provides instructions for a protein that helps regulate the immune system. When this gene has a specific variation, the immune system stays in a constant state of high alert, leading to systemic inflammation ^[1][3].

The hallmark of PAMI is the combination of specific laboratory findings and physical symptoms:

• Extremely High Zinc and Calprotectin: Patients with PAMI have levels of zinc and a protein called calprotectin (also known as MRP8/14) that are markedly higher than normal ^[1][4]. These markers are often what lead doctors to the diagnosis ^[1].
• Blood Count Changes (Cytopenias): In the 2022 review, almost every reported patient experienced anemia (low red blood cells) and neutropenia (low levels of neutrophils, a type of white blood cell that fights infection) ^[1].
• Organ Enlargement: It is very common for the spleen (splenomegaly) and liver (hepatomegaly) to become enlarged as a result of systemic inflammation ^[1].
• Growth and Skin: Many children face growth failure (not growing at the expected rate for their age) and skin issues, such as ulcers or severe acne ^[1]. (Note that statistics from small case reviews do not strictly predict the outcome for every individual patient.)

The Diagnostic Journey

Finding a diagnosis for a rare disease is often a long and difficult journey. While the median age when symptoms first appear is roughly 3.9 years, some children show signs as early as infancy, and others may not be diagnosed until adulthood ^[1][5].

Because the symptoms can look like other conditions, it is common for families to face diagnostic detours. For example, the joint pain of PAMI might be mistaken for other types of bone disease, or the low blood counts might be misidentified as different types of autoimmune anemia ^[6][7]. In one extreme case, a patient waited 30 years from the start of symptoms to receive the correct PAMI diagnosis ^[8].

How PAMI Differs from PAPA Syndrome

PAMI is part of a family of diseases caused by PSTPIP1 mutations. You may hear it compared to PAPA syndrome (Pyogenic Arthritis, Pyoderma gangrenosum, and Acne). While both cause skin and joint issues, PAMI has distinct features ^[9]:

• Blood Counts: PAMI specifically causes low white blood cell counts (neutropenia), which is not typically seen in PAPA ^[9][10].
• Zinc and Calprotectin Levels: The massive elevation in blood zinc and calprotectin levels is characteristic of PAMI and significantly higher than what is seen in PAPA ^[1].
• Systemic Reach: PAMI frequently involves systemic signs like growth failure and organ enlargement, whereas PAPA tends to focus more heavily on the joints and skin ^[9].

What Research Says About Treatment

Currently, there is no single established treatment that works for every patient with PAMI. Research shows that while some symptoms might improve with a specific medication, others—like low neutrophil counts—may persist ^[1][6].

Doctors often use a variety of off-label medications to calm the immune system, including:

• Corticosteroids (to reduce immediate inflammation) ^[1].
• Biologics (targeted therapies like IL-1 inhibitors or anti-TNF agents) ^[1][11].
• Immunosuppressants (such as cyclosporine or methotrexate) ^[1].

In very severe cases where medications are not enough, hematopoietic stem cell transplantation (a bone marrow transplant) has been used, though it carries substantial risks ^[12].

Ongoing Monitoring

Living with PAMI requires regular check-ups to track how the body is responding. Standard care usually includes:

1. Regular Blood Work: Monitoring white and red blood cell counts, as well as inflammatory markers like CRP (C-reactive protein) and ESR (erythrocyte sedimentation rate) ^[1][11].
2. Organ Checks: Periodic clinical exams or ultrasounds to check the size of the liver and spleen ^[1].
3. Kidney and Liver Function: Recent reports suggest it is important to watch kidney and liver health over the long term, as chronic inflammation and treatments can affect these organs ^[9].
4. Growth Tracking: Carefully plotting height and weight to ensure the patient is receiving enough nutrition and that inflammation is not stalling their development ^[1].