Elevate | What You Should Know About Your Role in Myelofibrosis Treatment and Care Decisions Resource Guide

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Evolving Myelofibrosis Treatment Options: What You Should Know Resource Guide

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Thriving with an Myeloproliferative Neoplasm (MPN) Resource Guide

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Thriving With an MPN | Managing Symptoms and Treatment Side Effects Resource Guide

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Becoming an Empowered and [ACT]IVATED MPN Patient

Patient Empowerment Network (PEN) is committed to efforts to educate and empower patients and care partners in the myeloproliferative neoplasm (MPN) community. MPN treatment options are ever-increasing with research advancements in treatments and testing, and it’s essential for patients and families to educate themselves with health literacy tools and resources on the latest information in MPN care. With this goal in mind, PEN kicked off the [ACT]IVATED MPN program, which aims to inform, empower, and engage patients to stay abreast of up-to-date information in myeloproliferative neoplasm care.

The [ACT]IVATED MPN program is aimed at newly diagnosed MPN patients, yet it can help patients at any stage of disease. [ACT]IVATED MPN helps patients and care partners stay updated on the latest options for their MPN, provides patient activation tools to help overcome care disparities and barriers to accessing care, and powerful tips for self-advocacy, coping, and living well with  a blood cancer.

MPN Expert

Myeloproliferative Neoplasm Disparities

Race or ethnicity may have an impact on some health conditions, including MPNs. Cancer patient Lisa Hatfield interviewed Dr. Idoroenyi Amanam, Assistant Professor in the Division of Hematology at City of Hope. He explained about MPN risks and outcomes that may be impacted by patient race or ethnicity. “…we know that if you have high blood pressure, you have a higher risk for these complications-associated MPNs. And we know that African American males have a higher risk for that, so I think those things are…that example is a clear indicator that really identifying these basic risk factors that are related to diet, exercise, your weight, and other behavioral, possibly behavior-related factors may put you at higher risk to have complications from MPNs.”

 

Dr. Amanam further shared research findings and what needs further study to draw conclusions. “We have looked at incidences of thrombotic events in patients who have MPNs, and we tried to see if there was a difference between racial groups, and we didn’t. We did see that if you’re younger, you do have a higher risk of thrombosis over time, but there was no difference for if you were white, Hispanic, or African American. What we did find though, in a small single center study is that if you are non-white, there’s a higher risk of death over time. And I think we still need a lot of work to get a better understanding as to why that’s the case.”

Dr. Amanam Background

Solutions for Improved Myeloproliferative Neoplasm Care

Clinical trials are key in moving MPN research forward to improved treatments and care. Dr. Amanam shared his perspective about other players besides patients who can help move the needle forward. “I think that going back to the idea that we want to practice the best science, we want to be able to publish the best data. The responsibility is on the clinicians, the scientists, the clinical trialists, the drug companies, the institutions to really be able to structure clinical trials that are relevant to our real world experience. And so how can we better encourage that? I think from a government perspective, potentially incentivizing drug companies and institutions and the other major players that really are involved in pushing this field forward to practice better science.

Dr. Amanam expanded on how clinical trials can be diversified. “And once we’re clear that being able to have a diverse participant pool will give us the best results and therefore will lead to your drug being approved. I think we will have more participants from all groups.

Some underrepresented patient communities may experience obstacles to MPN care. MPN Nurse Practitioner Natasha Johnson from Moffitt Cancer Center provided advice to help patients. “Patients themselves can research clinical trials by looking at clinicaltrials.gov and see what’s out there and contact the academic center that’s performing those trials. There’s free information online that provides recorded sessions from conferences or speakers or speaking done by the MPN experts that you can just look to and get to easily to help understand the disease, knowing the symptoms, and then guiding treatment.” Natasha Johnson continued with additional advice for optimal care. “.…to try to get into a large cancer center or academic center and see an MPN expert. Many times, this is just by self-referral. Charity is sometimes provided through these. Zoom visits can be done as consults or follow-up visits. So my encouragement would be search these out, find out who the experts are, and contact them directly and see if there is any possibility or a way that you can get in to see an MPN expert for a consult so you can get the best care possible.” 

Signs of MPN disease progression is something that patients and providers must be on the lookout for. Natasha Johnson shared her advice for patients to empower themselves against disease progression. “…monitor your blood cell counts, be your own advocate. Think about if they’re changing, could it be medication, or is it disease progression? Monitor your symptoms. Look at the total symptoms score or write down your symptoms and try to record where you’re at in intervals. Are things getting worse? If they are, don’t wait three months for your next appointment. Contact your healthcare provider and ask to be seen. Ask about getting a repeat bone marrow biopsy to establish where the current disease status is because that can open up doors possibly to more treatments.”

The future of MPN care has an additional approach to address. Dr. Amanam shared his perspective and how patients can help advocate for improved treatments. “I think in the next three to five years, we’re going to have drugs that are going to actually be able to treat the underlying disease before it gets to a point where you may need more aggressive therapy…And so it’s exciting where we’re going, and I think the questions that as a patient that I would ask are, because of the fact that we only have few FDA-approved therapies, are there any clinical trials that are able to target the underlying disease as opposed to just treating the symptoms? I think that’s very important for the patients to ask, especially in this space now.

Rates for stem cell transplant approvals must improve for lower income groups and for African American and Hispanic groups to provide better health outcomes for blood cancers like MPNs. Dr.  Amanam explained what’s involved with transplants and how others can help as donors. “You can donate your bone marrow, or you can donate your stem cells that are not inside of your bone marrow. And typically as a donor, your experience of actually donating is about a day. And the recovery time after you donate your bone marrow or stem cells, it’s typically within about one to three days.  So the benefit of donating your stem cells or bone marrow outweighs the inconvenience of a day or a couple of days of your schedule being altered. So I think that’s really important to understand. And I think if we can get more people to be aware of this, I think we can definitely get more donors.

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[ACT]IVATED MPN Program Resources

The [ACT]IVATED MPN program series takes a three-part approach to inform, empower, and engage both the overall MPN community and patient groups who experience health disparities. The series includes the following resources:

Though there are myeloproliferative neoplasm disparities, patients and care partners can take action to empower themselves to help ensure optimal care. We hope you can take advantage of these valuable resources to aid in your MPN care for yourself or for your loved one.

[ACT]IVATED MPN Resource Guide en español

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Managing Life With an MPN | What You Need to Know Resource Guide

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What Patients Should Know About Developing MPN Treatments and Research Resource Guide

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What Is a JAK2 Mutation?

Editor’s Note: This resource, What is a JAK2 Mutation?, was originally published by MyHealthTeam.


One of the most commonly mutated proteins found in myeloproliferative neoplasms (MPNs) is the protein Janus kinase 2 (JAK2). This important discovery has changed how doctors diagnose and treat people with MPNs. We will be discussing both the JAK protein and the JAK gene.

MPNs are blood cancers caused by the overproduction of blood cells in the bone marrow. Mutations in the gene controlling JAK2 protein production occur most often in the three classic types of MPNs:

The V617F mutation in the JAK2 gene is found in:

  • 96 percent of polycythemia vera cases
  • 50 percent to 60 percent of primary myelofibrosis cases
  • 50 percent to 60 percent of essential thrombocythemia cases

Additionally, more than 50 different JAK2 mutations have been found in other parts of the JAK2 gene, primarily in PV cases.

What Is the JAK2 Gene?

The JAK2 protein plays an important role in controlling the production of blood cells from stem cells found in the bone marrow.

The JAK2 gene is responsible for genetically coding the JAK2 protein. This protein is part of the JAK/STAT pathway, which transmits signals to promote cell growth.

When the JAK2 protein is activated, it relays a signal to the protein STAT, which then binds to another STAT molecule in a process called dimerization. This group of molecules then moves into the cell’s nucleus, turning on genes that tell the cell to grow and proliferate.

What Causes JAK2 Mutations?

There are two main types of JAK2 mutations found in MPNs.

V617F Mutation

The V617F mutation is caused by a change in a single base in the genetic code. This simple change then switches the amino acid valine (V) to phenylalanine (F) at position 617 in the JAK2 protein, changing the shape of the protein. When this mutation is present, JAK2 signaling is turned on and cannot be turned off, leading to uncontrolled cell growth. In the case of MPNs, this causes an overproduction of blood cells, leading to blood cancers.

Multiple Mutations

Many different types of mutations can be found within multiple parts of the JAK2 gene. More than 50 different mutations have been identified in the gene, and almost all of these occur in people with PV.

One part of the JAK2 gene is particularly susceptible to mutations. This area genetically codes for a linker that connects two parts of the JAK2 protein. Common mutations here include deletions and insertions. A deletion is when entire pieces of the protein are lost. Insertions occur when incorrect pieces are put into the protein. Insertions and deletions change the shape of the JAK2 protein, which can affect its function.

Do JAK2 Mutations Cause MPNs?

MPNs are caused by a mutation in a single stem cell found in the bone marrow. These mutations cause the cell to rapidly divide, creating too many of one cell type. JAK2 gene mutations are involved in many cases of MPNs. In addition to JAK2 genesmutations found in CALR and MPL genes are also common contributors to the development of MPNs. These three mutations are usually mutually exclusive, meaning that if one mutation is present, then the others are not.

JAK2 Mutations and MPN Diagnosis and Prognosis

A number of tests are required to diagnose MPNs, each providing a different piece of information. The doctor will begin with a physical examination and health history. They may also order a complete blood count (CBC) with a differential, which assesses the number of red blood cells, platelets, and white blood cells.

Because most MPNs are associated with a specific genetic mutation, a pathologist may use blood samples to test for these. Two tests used to identify genetic abnormalities are quantitative polymerase chain reaction (qPCR) and fluorescent in situ hybridization (FISH). Typically, only one of the two tests is required for diagnosis. It is also an option to perform DNA sequencing to identify the driving mutation in an MPN case.

Quantitative Polymerase Chain Reaction

Quantitative polymerase chain reaction (qPCR) is the most commonly used method for diagnosing JAK2 mutations. qPCR is also the most sensitive test, and it can detect small amounts of mutation when other methods fail.

With qPCR, DNA obtained from a blood test is mixed with a fluorescent dye, which is run through a machine that amplifies the sequences containing the JAK2 mutation.

Fluorescent In Situ Hybridization

This test determines whether someone has chromosomal abnormalities contributing to a cancerous phenotype. For example, one type of MPN, chronic myeloid leukemia (CML), is characterized by the presence of a Philadelphia chromosome (named for where it was discovered). A Philadelphia chromosome forms when two pieces of broken chromosomes stick together. This is also called the BCR-ABL1 gene, because one broken piece contains the BCR gene, and the other contains the ABL1 gene.

Most people with MPNs who are Philadelphia chromosome-negative (Ph-) have the V617F mutation in JAK2. This important discovery revealed the driving mutation behind Ph- MPNs. Before the discovery of JAK2 mutation, the cause of these defects was unknown. This also led to the development of specific JAK2 inhibitors for treatment of myeloproliferative disorders.

In 2016, the World Health Organization (WHO) revised its document “WHO Classification of Tumours of Haematopoietic and Lymphoid Tissues.” This revision included new criteria for diagnosing MPNs by the three main driver mutations in JAK2, CALR, and MPL genes. PV is characterized by the presence of a JAK2 mutation. ET and MF are characterized by the presence of any of the three driver mutations.

JAK2 Mutations and MPN Treatments

Since the discovery of JAK2 mutations in MPNs, researchers have developed a number of inhibitors targeting the protein. There are currently two JAK2 inhibitors approved by the U.S. Food and Drug Administration (FDA) for the treatment of MPNs:

Jakafi

Jakafi (ruxolitinib) is approved for treatment of MF hydroxyurea-resistant PV. It is also being investigated for use in people with hydroxyurea-resistant ET. Additionally, some trials are investigating the effects of Jakafi in combination with the antimetabolite chemotherapies Vidaza (azacitidine) and Dacogen (decitabine). Antimetabolites are a special type of cancer drug that interfere with DNA by acting as a substitute for the normal building blocks of DNA.

Inrebic

Approved in 2019, Inrebic (fedratinib) is the newest MPN drug in almost a decade. It’s used to treat three forms: high-risk MF, post-polycythemia vera MF, and post-essential thrombocythemia MF with splenomegaly (enlarged spleen).

Other JAK2 inhibitors are currently in phase 3 clinical trials, including Pacritinib for the treatment of MF and severe thrombocytopenia, and Momelotinib for the treatment of MF. These promising new drugs are in final phases of testing.

Overall, the discovery of JAK2 mutations in MPNs has helped advance drug research, development, and MPN treatment. It has also helped combat uncontrolled proliferation of blood cells, improving the lives of people with MPNs. New medications continue to be developed and tested, providing a hopeful future for those affected by myeloproliferative diseases.

Finding Support With an MPN

You are not alone living with an MPN. When you join myMPNteam, you gain a community of others who know what it’s like to face a rare blood cancer diagnosis.

Do you know whether your MPN has tested positive for a JAK mutation? Did your doctor explain what the results of the test mean for your condition? Share your experiences on myMPNteam.

How Clinical Trials Advance MPN Treatment and Research Resource Guide

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