Tag Archives: myelofibrosis

SOHO State of the Art Updates and Next Questions | Diagnosis, Outcomes, and Management of Prefibrotic Myelofibrosis

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Pankit Vacchani, Sanam Lohgavi, Prithviraj Bose

Abstract

Prefibrotic primary myelofibrosis (prefibrotic PMF) is a myeloproliferative neoplasm with distinct characteristics comprising histopathological and clinico-biological parameters. It is classified as a subtype of primary myelofibrosis. In clinical practice, it is essential to correctly distinguish prefibrotic PMF from essential thrombocythemia especially but also overt PMF besides other myeloid neoplasms. Risk stratification and survival outcomes for prefibrotic PMF are worse than that of ET but better than that of overt PMF. Rates of progression to overt PMF and blast phase disease are also higher for prefibrotic PMF than ET. In this review we first discuss the historical context to the evolution of prefibrotic PMF as an entity, its presenting features and diagnostic criteria. We emphasize the differences between prefibrotic PMF, ET, and overt PMF with regards to presenting features and disease outcomes including thrombohemorrhagic events and progression to fibrotic and blast phase disease. Next, we discuss the risk stratification models and contextualize these in the setting of clinical management. We share our view of personalizing treatment to address unique patient needs in the context of currently available management options. Lastly, we discuss areas of critical need in clinical research and speculate on the possibility of future disease course modifying therapies in prefibrotic PMF.

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Dr Vincelette on MYC Expression in Myelofibrosis

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Nicole D. Vincelette, PhD

Nicole D. Vincelette, PhD, postdoctoral fellow, Moffitt Cancer Center, discusses findings from a study investigating the role of MYC expression and S100A9-mediated inflammation in a subgroup of triple-negative myeloproliferative neoplasms (MPNs).

To determine how MYC expression drives MPNs, such as polycythemia vera, essential thrombocythemia, and primary myelofibrosis, Vincelette and colleagues conducted a study in which they generated a mouse model that overexpresses MYC in the stem cell compartment. This analysis demonstrated that MYC overexpression was associated with the mice developing a myelofibrosis-like phenotype, which included anemia, atypical megakaryocytes, splenomegaly, bone marrow fibrosis, liver fibrosis, spleen fibrosis. The mice also experienced adverse clinical outcomes, such as reduced overall survival (OS), compared with wild-type mice, Vincelette says.

Since the MYC-overexpressed mice developed myelofibrosis, the next step of this research was to investigate how MYC drives myelofibrosis, Vincelette explains. Investigators performed single-cell RNA sequencing to compare the bone marrow cells from MYC-overexpressed and wild-type mice. MYC overexpression correlated with upregulation of the S100A9 protein, which contributes to inflammation and innate immunity, according to Vincelette. Therefore, MYC drives the development of myelofibrosis through S100A9-mediated chronic inflammation. To validate the role of S100A9 downstream of MYC in myelofibrosis, investigators created a mouse model with S100A9 knockout in the presence of MYC overexpression, Vincelette notes. The S100A9 knockout protected against the development of myelofibrosis phenotype in that mouse model, Vincelette emphasizes.

By generating a mouse model that overexpresses S100A9, investigators also determined that S100A9 overexpression alone contributes to the development of myelofibrosis phenotypes, Vincelette says. When investigators treated the MYC-overexpressing mice with the S100A9 inhibitor tasquinimod (ABR-215050), the agent only partially abrogated the myelofibrosis phenotype, meaning the mice had reduced atypical megakaryocytes and splenomegaly. Additionally, the mice developed anemia and no OS difference occurred between tasquinimod and vehicle treatment, potentially because of off-target drug effects, Vincelette concludes.

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CTI BioPharma Announces Extension of FDA Review Period for Pacritinib in MF with Severe Thrombocytopenia

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SEATTLE, Nov. 30, 2021 /PRNewswire/ — CTI BioPharma Corp. (Nasdaq: CTIC) today announced the U.S. Food and Drug Administration (FDA) has extended the review period for the New Drug Application (NDA) for pacritinib for the treatment of adult patients with intermediate or high-risk primary or secondary (post-polycythemia vera or post-essential thrombocythemia) myelofibrosis (MF) with a baseline platelet count of <50 × 109/L. The Prescription Drug User Fee Act (PDUFA) action date has been extended by three months to February 28, 2022.

In the second quarter of 2021, the FDA granted priority review for CTI’s NDA for patients with myelofibrosis with a PDUFA date of November 30, 2021. In the course of product labeling discussions, the FDA requested additional clinical data, which was submitted to the agency on November 24, 2021. Earlier today, the FDA informed the Company that it considers the data submission to constitute a “major amendment” to the NDA and therefore the PDUFA date has been extended by three months to provide additional time for a full review of the submission. At the current time, CTI is not aware of any major deficiencies in the application.

“CTI is continuing to engage collaboratively and constructively with the FDA during review of our NDA,” said Adam R. Craig, M.D., Ph.D., President and Chief Executive Officer of CTI Biopharma. “We are committed to providing patients suffering from cytopenic myelofibrosis with a new treatment option as soon as possible and are confident in pacritinib’s potential to establish a new standard of care.”

Pacritinib is a novel oral kinase inhibitor with specificity for JAK2, IRAK1 and CSF1R, without inhibiting JAK1. The NDA was accepted based on the data from the Phase 3 PERSIST-2 and PERSIST-1 and the Phase 2 PAC203 clinical trials, with a focus on the severely thrombocytopenic (platelet counts less than 50 x 109/L) patients enrolled in these studies who received pacritinib 200 mg twice a day, including both frontline treatment-naive patients and patients with prior exposure to JAK2 inhibitors. In the PERSIST-2 study, in patients with severe thrombocytopenia who were treated with pacritinib 200 mg twice a day, 29% of patients had a reduction in spleen volume of at least 35%, compared to 3% of patients receiving the best available therapy, which included ruxolitinib; 23% of patients had a reduction in total symptom scores of at least 50%, compared to 13% of patients receiving the best available therapy. In the same population of patients treated with pacritinib, adverse events were generally low grade, manageable with supportive care, and rarely led to discontinuation. Platelet counts and hemoglobin levels were also stabilized.

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Selecting Therapy to Treat MF

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OncLive

Pankit Vachhani, MD: Fedratinib is a JAK2 inhibitor that was recently FDA approved for treatment of patients with myelofibrosis, intermediate-2 and high risk. We consider using this drug either in the frontline space or in a setting where ruxolitinib has previously been used and failed the patient in giving them a long-term benefit.

When a patient is newly diagnosed with myelofibrosis, if their platelet count is higher than 50 x 109 per liter and they happen to be intermediate-2 or high risk in terms of their risk stratification, one could either use ruxolitinib or fedratinib in that setting. A key thing to consider here is the need for an assessment for stem cell transplant. Should a patient progress after using the first JAK2 inhibitor, they could use the alternative JAK2 inhibitor, or consider clinical trials at that point as well.

If, on the other hand, a patient has lower-risk myelofibrosis, the key thing to identify is whether they are symptomatic. For patients who are symptomatic, one could use ruxolitinib to alleviate the patient’s symptoms despite the disease being lower risk in nature. If one should need to use alternative agents, these would include drugs like hydroxyurea or interferon. In the event that the patients have lower-risk myelofibrosis and are asymptomatic, one may choose to monitor the patients every few months to assess their symptomatology, spleen volume or length, and assess their platelet counts.

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MPN Specialists Videos

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MPN Advocacy & Education International partnered with MPN specialists to offer insights on patient concerns and updates on drug treatments during this pandemic. The videos are now available on our YouTube channel, click here to subscribe.

These videos are made possible by a grant from Bristol Myers Squibb

Naveen Pemmaraju, MD-MD Anderson Cancer Center

 

Mark Heaney, MD, PhD-Columbia University Medical Center

 

Ellen Ritchie, MD-Weill Cornell Medicine

 Linda Smith-Resar, MD-Johns Hopkins

Dr. Resar’s presentation will be posted as soon as it is available.

One Patient’s Point of View on “Living” with Myelofibrosis

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David told his story at the Cleveland MPN Patient Program in November

On a beautiful fall day in late August 2013, I received a call that changed the course of my life. The voice on the other end told me that they had reviewed my blood counts and determined that I had some sort of leukemia. They had pre-admitted me to the local hospital to meet an oncologist and have the necessary tests. After about two weeks I received my diagnosis of Primary Myelofibrosis, Intermediate 1. I was told that treatment options were limited and the only true cure was allogeneic bone marrow transplan

It is tempting to focus all our energies on our hope in medical interventions. But diagnosis brings fear, denial, anger, & depression. These impact your relationships and can throw you into a downward spiral. Being diagnosed with a life-threatening disease like an MPN is an existential challenge. It raises all the questions: Why are we here? What is life about? What lies beyond this life? How you answer these questions will affect how you deal with your disease and its physical effects.

We are all tempted to be sad and maybe even angry. But you do not have to give in to the negative. You can choose to respond with a positive attitude.

 

My diagnosis has changed the course of my life – but for the better. Because of myelofibrosis, I realized that I was spending far too much of my time and energy focused on some sort of future achievement. I was super-busy every day and the days passed in a blur. But myelofibrosis woke me up to the truth that life is not about some future achievement. Life is about today. Since my diagnosis, I have come to have a heightened enjoyment of the simple pleasures of daily living.

These last six years have been wonderful and I have enjoyed them more because of my disease. My son and his wife have been kind enough to give us two new grandchildren in the past four years – and I am making the most of that. I’ve made many good friends in the MPN community.  I took up motorcycle riding.  The more aware I am of my mortality – the more I savor every experience of life.

Your life only comes one day at a time. Today is the day you have – make it into something good. Refuse to let an uncertain future rob you of today’s joys.

David shared his story in the MPN Community Connection Newsletter click here to view

 

David is the support group coordinator for the northern Pennsylvania/Ohio area, if you are interested in participating you can contact us for more information. Click here to contact us.

 

 

 

 

Fedratinib and Ruxolitinib: Advice for Deciding Which Agent to Give and When

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The introduction of fedratinib (Inrebic) to the treatment landscape of myelofibrosis (MF) and the challenges that have arisen over deciding between administering fedratinib or ruxolitinib (Jakafi) means more community oncologists should consult specialists when treating these patients, said Andrew Kuykendall, MD.

Research shows that fedratinib and the earlier JAK inhibitor, ruxolitinib have similar efficacy in patients with MF. However, their toxicity profiles differ, and the potential for encephalopathy with fedratinib is an ongoing concern, resulting in a black box warning on the label. Now that the agent is FDA approved for the treatment of MF, oncologists are left with a decision of which JAK inhibitor to give to which patients and when to prescribe them.

How to continue using ruxolitinib now that fedratinib is available remains an unanswered question, said Kuykendall, assistant member, Moffitt Cancer Center; however, experts in treating myeloproliferative neoplasms (MPNs) can be a helpful resource for other oncologists.

Another resource for treatment decision-making is clinical data from the JAKARTA-2 trial, which studied fedratinib in patients with MF who were previously treated with ruxolitinib. Findings from a re-analysis of the study were presented at the 2019 ASCO Annual Meeting and showed that 46 of the 83 assessable patients achieved a spleen response (55%; 95% CI, 44%-66%), meeting the primary endpoint of the study.

The most common adverse events included diarrhea (n = 60), nausea (n = 54), vomiting (n = 40), constipation (n = 20), and others. Additionally, hematologic abnormalities including, grade 3/4 anemia (n = 96), thrombocytopenia (n = 68), and neutropenia (n = 23) were seen. Eighteen patients (19%) discontinued treatment due to adverse events.

These data suggest that fedratinib may be a second-line option for patients who are resistant or sensitive to ruxolitinib. The management of the gastrointestinal (GI)-related toxicities and checking of thymine levels to prevent encephalopathy, however, are newer management concerns that physicians must be aware of when administering fedratinib to patients with MF and is another point when consulting an MPN specialist may come in handy.

Read Targeted Oncology’s interview with Dr. Kuykendall.

Caregiving: What I’ve Learned

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By Stephen W.

My wife was diagnosed with ET (Essential Thrombocythemia) in 2007. Since then, her health issues have varied. For several months, she will do very well with little to no problems, and then an episode that has included an ER visit on occasion, will throw us into action mode. Even our children know what is expected of them. We all becoming a caregiving team.

Caregiving has many layers. It requires endurance, listening skills, humility, open mindedness, flexibility, wisdom, empathy, managerial skills, problem solving skills, healthy choices, rest, outlets, support and in many ways, the needs similar to those we care for, except that we have to be willing to be the strength BEHIND the patient.

Endurance. There will be days when the one you are caring for requires everything you’ve got. It is easy to get burnt out. You may find yourself doing it all and feeling a bit resentful, at times. My suggestion is to get a backup caregiver. So many people offer help and we graciously decline with a thank you and assurance that we are okay. I now say, thank you and how can you help? Getting help doesn’t mean you are shrugging your responsibilities or care less about your loved one. It is a wise decision when times are tough. Sometimes just having someone grocery shop is a great gift.

Humility. Caregiving is not about you. I’ve learned to keep my place and learn from my wife and those that administer her medical care. I don’t have all the answers. My role is vital but there is no room for an ego.

Managerial skills. I never dreamed the managerial skills I learned in my career would come in handy for caregiving. Managing appointments, medical needs, insurance companies, children, household needs, and day to day care for the patient can be overwhelming without a system. When times are tough we run a tight ship with each of us knowing our role and responsibilities. Delegating is a way of life. We’ve learned to adjust quickly and as needed.

Keeping EVERYONE healthy. Parenting and caregiving for an adult are very similar. If we aren’t healthy, everyone suffers. Proper nutrition, exercise, rest, and finding outlets and support are essential. Recognize when you need a break and take it.

The Rewards. I’ve never felt closer to my wife. Our family is stronger and we know we can rely on one another. I’ve learned a lot about ET, but equally about life and love.

Click here for more Caregiver Resources