Selinexor by Karyopharm Therapeutics for Chronic Idiopathic Myelofibrosis (Primary Myelofibrosis): Likelihood of Approval

August 28, 2023

elinexor is under clinical development by Karyopharm Therapeutics and currently in Phase II for Chronic Idiopathic Myelofibrosis (Primary Myelofibrosis). According to GlobalData, Phase II drugs for Chronic Idiopathic Myelofibrosis (Primary Myelofibrosis) does not have sufficient historical data to build an indication benchmark PTSR for Phase II. GlobalData uses proprietary data and analytics to create drugs-specific PTSR and LoA in the Selinexor LoA Report. 

GlobalData tracks drug-specific phase transition and likelihood of approval scores, in addition to indication benchmarks based off 18 years of historical drug development data. Attributes of the drug, company and its clinical trials play a fundamental role in drug-specific PTSR and likelihood of approval.

Selinexor overview

Selinexor (Xpovio, Nexpovio) is an antineoplastic agent. It is formulated as film coated tablets for oral route of administration. Xpovio in combination with dexamethasone is indicated for the treatment of adult patients with relapsed or refractory multiple myeloma (RRMM) who have received at least four prior therapies and whose disease is refractory to at least two proteasome inhibitors, at least two immunomodulatory agents, and an anti-CD38 monoclonal antibody. Xpovio is indicated for the treatment of adult patients with relapsed or refractory diffuse large B-cell lymphoma (DLBCL), not otherwise specified, including DLBCL arising from follicular lymphoma, after at least 2 lines of systemic therapy. Xpovio in combination with bortezomib and dexamethasone is indicated for the treatment of adult patients with multiple myeloma who have received at least one prior therapy. It is also under development for the treatment of soft tissue sarcoma, osteosarcoma, leiomyosarcoma, pleomorphic liposarcoma, synovial sarcoma, epithelial ovarian cancer.

Selinexor (KPT-330) is under development for the treatment of light chain amyloidosis, anaplastic astrocytoma, diffuse intrinsic pontine glioma (DIPG), high-grade glioma (HGG), newly diagnosed advanced hepatocellular carcinoma, metastatic urothelial carcinoma, relapsed or refractory peripheral T cell lymphoma and natural killer T cell lymphomas,  relapsed/refractory indolent non-Hodgkin lymphoma (R/R iHNL), malignant peripheral nerve sheath tumor (MPNST), leiomyosarcoma, endometrial stromal sarcoma, ovarian carcinoma, endometrial carcinoma, fallopian tube cancer, metastatic triple negative breast cancer, thymoma, non-small cell lung cancer, cervical carcinoma, non-Hodgkin lymphoma, melanoma, colon cancer, gastroenteropancreatic tumors, prolymphocytic leukemia, small lymphocytic lymphoma, recurrent glioblastoma, follicular lymphoma, mantle cell lymphoma, chronic lymphocytic leukemia (CLL), relapsed/refractory multiple myeloma (MM), relapsed and refractory acute myelogenous leukemia (AML), diffuse large B-cell lymphoma, chondrosarcoma, synovial sarcoma, liposarcoma, leiomyosarcoma, blast-crisis chronic myelogenous leukemia (bc-CML), relapsed and refractory acute lymphoblastic leukemia, rectal cancer, lung cancer, gynecological cancer, Penta-refractory multiple myeloma, recurrent/refractory high-grade gliomas, myelofibrosis, primary myelofibrosis, Post-Polycythemia Vera Myelofibrosis, Post-Essential Thrombocythemia Myelofibrosis (Post-ET MF), Ewing sarcoma and myelodysplastic syndrome, gastrointestinal stromal tumor (GIST), non-small cell lung cancer and recurrent glioma. The drug candidate is administered orally as a tablet and topically as a gel. It is a SINE compound that acts by targeting CRM1 (chromosome region maintenance 1 protein, exportin 1 or XPO1). It is being developed based on Selective Inhibitor of Nuclear Export (SINE) compound technology.

It was also under development for the treatment of coronavirus disease 2019 caused by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), refractory or relapsed Richter’s transformation, metastatic castrate-resistant prostate cancer, advanced squamous cell carcinoma of head and neck, lung cancer and esophageal cancer, relapsed/refractory cutaneous T cell lymphoma, relapsed small cell lung cancer, rectal adenocarcinoma, gastric cancer, metastatic colorectal cancer and diabetic foot ulcers.

It was also under development for the treatment of recurrent glioblastoma multiforme.

Karyopharm Therapeutics overview

Karyopharm Therapeutics (Karyopharm) discovers and develops novel drugs for the treatment of cancer and other diseases. The company’s core technology harnesses the inhibition of nuclear export as a mechanism to treat patients suffering from cancer. Karyopharm’s lead product, Xpovio, is being developed for the treatment of multiple myeloma, and relapsed or refractory diffuse large B-cell lymphoma. Its pipeline drug candidates include selinexor, eltanexor, verdinexor, and KPT-9274. Karyopharm’s drug candidates are indicated for the treatment of various hematological and solid tumor malignancies including multiple myeloma, diffuse large B-cell lymphoma, liposarcoma, glioblastoma and endometrial cancer. The company has operations in the US, Israel and Germany. Karyopharm is headquartered in Newton, Massachusetts, the US.

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Know What Questions to Ask When Treating MPNs

July 27, 2023

Brielle Benyon

Oncology nurses must know what to look for — and what questions to ask — when treating patients with myeloproliferative neoplasms (MPNs), as side effects and other patient characteristics can play a role in determining the best treatment regimen, according to Julie Huynh-Lu, PA-C, a physician assistant from The University of Texas MD Anderson Cancer Center.

MPN-Related Symptoms

“Whenever a patient comes to see us, they also fill out the MPN10 questionnaire, [which is] a list of all the 10 symptoms that frequently occur in our patients,” Huynh-Lu said in an interview with Oncology Nursing News. “Ideally, this should be occurring at every visit. On top of them filling that out, I obviously will ask them specific pointed questions as well just to tease out some more information. But this should occur at every visit.”

Symptoms can vary based on the subtype of MPN a patient has. Huynh-Lu said that patients with polycythemia vera and essential thrombocytosis are more likely to experience headaches, confusion or difficulty focusing, or pain and tingling in the fingertips. Meanwhile, common symptoms for patients with myelofibrosis include anemia and thrombocytopenia; shortness of breath and fatigue; bleeding; and complications from spleen enlargement, such as having a poor appetite.

Knowing about these symptoms is key, as they could indicate a physical issue that warrants a change in treatment, Huynh-Lu said. For example, if a patient is not experiencing splenomegaly (enlarged spleen), there may not need to be prescribed a JAK inhibitor. However, if the patient starts to experience a decreased appetite or feel full after eating only a small amount of food, that could indicate that their spleen is becoming enlarged, and that patient may benefit from being put on a JAK inhibitor.

“It can also change the trajectory on whether or not talking about splenectomy is an option. It’s not really our go-to [treatment] in our department at MD Anderson, but that could certainly lend to a conversation into if surgery is an option,” Huynh-Lu said.

Sometimes symptoms can lead to a change in treatment, while other times there may be an easy fix to manage the issue.

If a patient is currently taking a JAK inhibitor, nurses should be sure to ask them about worsening itching, diarrhea, and frequent infections (such as urinary tract infections or pneumonia). Secondary skin cancers can also occur, said Huynh-Lu, “so we always recommend that they get dermatology checks every 6 months.”

“If their [blood] counts are starting to drop, or if their spleen is starting to grow, well, maybe the medication they’re on right now, the dosage needs to be altered. But if we alter the dose to a higher medication dose, and the side effects are worse, maybe then it’s time to switch to a different class of drugs completely, or same class of drugs, just a different type of drug. There’s also, of course, clinical trials that are available, so that could be an option as well,” Huynh-Lu said.

Patient Characteristics and Comorbidities

Regarding patient characteristics and comorbidities, clinicians should know if patients have a history of cardiac, renal, or hepatic complications, as certain medications can affect these organs.

Additionally, interferons are commonly used to treat patients with polycythemia vera. However, according to the National Institutes of Health, these drugs can impact the synthesis of serotonin, dopamine, epinephrine, and norepinephrine, thereby increasing a patient’s risk for depression. That said, clinicians should know if patients have a history of depression or an autoimmune disease before they prescribe an interferon to a patient, Huynh-Lu said.

It also may be beneficial for oncology nurses to ask patients if they are experiencing financial struggles due to their cancer care.

“I know these drugs can be quite expensive. Financially, this can be a burden for some … Sometimes the local oncologists aren’t completely aware of financial assistance available for them. So maybe just ask and say, ‘Hey, I know this drug cost this much. Do you know of any financial assistance that you guys can provide for me?’ Because I know sometimes that’s not a question that gets asked,” Huynh-Lu said.

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A Caregiver’s Story: The Journey of a Spouse Through the Transplant Process

In March, MPN Advocacy & Education International highlighted the story of a recent stem cell patient, Andrea (click here to view story). This month, Andrea’s wife, Denise, shares her story as a caregiver in an interview with us. 

Andrea and Denise

How did you feel about your spouse’s decision to have a transplant? Were you apprehensive? 

I have been a part of Andrea’s medical journey since her diagnosis from ET to myleofibrosis.  I recall it took me about a week to learn how to pronounce the name correctly, and it has been an education ever since.  Being present during doctor appointments and multiple clinical trials provided first-hand information in addition to our ongoing discussions.  Observing and experiencing her five years of transfusion independence was a gift.  We took advantage of the opportunity to cycle and travel together and separately. Knowing the clinical trial would either end or the drug would quit working was only a matter of time.  And knowing how she physically felt prior to and after this time period played a role in my ‘wrapping my head’ around a possible future transplant.  All the while, we adjusted and modified activities as needed in order to continue allowing her to live life to the fullest.

When medications were no longer yielding the same results, and Andrea’s blood transfusions became more frequent, the doctors felt the alternatives were to continue clinical trials and hope for the best or discuss a stem cell or bone marrow transplant. I felt she was strong enough physically to beat the odds. It was now or never. I never doubted our decision, and have had no regrets.

How did you prepare yourself as a caregiver? 

In order to prepare, I scoured MD Anderson’s educational resources to understand what a ‘typical’ transplant journey would entail.  I developed multiple spreadsheets to track medications, nutrition, recovery, therapy, etc. I left the online myleofibrosis forum readings to Andrea as she would report her findings from reading first-hand accounts.  She also talked to many individuals who had had transplants, pummeling them with questions.

Another important piece of this journey was my mindset.  I focused on the end goal – her successful transplant and healthy recovery.  I looked at the journey in three parts:

  1. Pre-transplant
  2. Transplant/hospital stay
  3. Post-transplant

My goal was to have as much of her daily care and needs become second nature to me prior to her hospital release. When she was released, the additional environmental interaction was familiar without the distraction of ‘everything new all at one time’.

What tools did you find useful as the caregiver and advocate?

I created a 3-ring notebook with tabs to manage spreadsheets, medical records/test,  and doctor questions, so I could access information easily and quickly. I created a spreadsheet to track her medication schedule.  The purpose was to help me identify what was needed, including dosage when refilling medications both inside and outside the hospital. Click here to view medication tracker template. (For an Excel spreadsheet version of the attached please email kmichael@mpnadvocacy.com).

I also knew there was a good possibility that after her hospital release and within the first 100 days, she would have a trip to the emergency room and be re-admitted to the hospital.  Therefore, medications and ‘the notebook’ were kept in one location and easily picked up and transported with us.  The notebook was with us each time we visited the care team.

I created additional spreadsheets to help track:

  • Food and water daily intake and output. This is useful for doctor & nutrition appointments.
  • Daily stats: blood pressure, temperature, pain levels, exercise, spirometer therapy.  This is useful for tracking blood pressure and temperature anomalies.  Because if her temperature rose to a specific number, she had to go to the emergency room immediately.
  • Signs of graft vs host disease (GVHD).
  • I choose to stay in the hospital 24/7 to understand how the nursing staff/care team handled her care. This experience helped me understand her routine.
  • I figured if I learned her hospital routine, it would be familiar when she was released.
  • I used my smartphone and set alarms with labels so I knew what drugs were due when. (Used upon hospital release.)
  • I utilized Caring Bridge (www.caringbridge.org) to communicate Andrea’s transplant journey to her friends and family. My intent with each post was to create an engaging story yet convey “a day in her life” so everyone could get a sense of being there.

What was the most challenging part of your role and why?

Coming home and changing environments automatically kicked us back to normal behaviors and patterns. I felt we had to be more careful and diligent in preventing infection.  Even though we were home, I had to be more watchful because familiarity brings about a relaxed state.  Her immune system was developing and the risk of infection was too great.  Andrea quickly tired of me saying “No, you can’t do that or touch that.”

Once home, Andrea’s friends visited.  This was a considerable risk to her because the natural tendency is to hug and touch. To reduce her risk, we asked people to use hand sanitizer when they were around her.  We developed a routine where I would greet her friends first with a hug and explain she couldn’t hug yet. Andrea stood back a few feet to reduce her availability.

What I learned :

Every recovery and journey is different.

While it’s tempting, don’t measure your progress against someone else.  It’s your journey.  That goes for both the patient and caregiver!

The “notebook” was a great tool.  It kept us on schedule for all medications and were able to provide information to the doctors as needed.

The hospital care team staff is a critical part of your recovery.  Don’t opt for staying close to home if you feel a facility’s care team is better in another location.

Deciding where to have the transplant included researching the number of myleofibrosis transplants, versus other blood disease transplants, and the success that facility had.

Participate in the journey. I chose to shave my head at the same time Andrea did.  It sure made showering quick and easy!

Take in the outdoors and/or change the scenery.

Exercise or go for walks.  Listen to music.  Visit a friend. Go to the grocery store.  Do something to clear your head and regain perspective.

Have a confidante. It’s normal to question, or become frustrated, and to second guess.  But remember – it’s temporary.

You are the coach, cheerleader, and guardian all at once.  Embrace the many hats you will wear!

Click here to read Andrea’s Transplant Story 

MPN Patient Daily Stats 06-10-18