- Updated 48-week data from Phase III ASCEMBL trial consistent with improved major molecular response (MMR) rate of Scemblix® (asciminib) vs. Bosulif®* (bosutinib) and lower discontinuation rate due to adverse reactions demonstrated in 24-week primary analysis1
- Data support longer-term use of Scemblix in patients with chronic myeloid leukemia (CML) who have previously struggled with intolerance and resistance to at least two prior tyrosine kinase inhibitor treatments2-4
- Differentiated by novel mechanism of action, Scemblix is the first FDA-approved CML treatment that works by binding to the ABL myristoyl pocket2-4
- Clinical development program continues, evaluating Scemblix across multiple treatment lines in CML2-19
Novartis today announced new 48-week data from the Phase III ASCEMBL trial of Scemblix® (asciminib) demonstrating that the results observed in the primary analysis (24 weeks) vs. Bosulif®* (bosutinib) were maintained in longer-term follow up for patients with Philadelphia chromosome-positive chronic myeloid leukemia in chronic phase (Ph+ CML-CP) previously treated with two or more tyrosine kinase inhibitors (TKIs)1-4.
In this analysis, presented at the 63rd American Society of Hematology Annual Meeting & Exposition (ASH), the major molecular response (MMR) rate at 48 weeks was 29.3% for patients treated with Scemblix vs. 13.2% for patients in the Bosulif arm, which is consistent with a doubling of the efficacy at 24 weeks (25% vs. 13% [P=0.029])1-4. The proportion of patients treated with Scemblix who experienced adverse reactions leading to discontinuation was more than three times lower than those in the Bosulif arm (7.1% vs. 25%)1.
Scemblix is the first FDA-approved CML treatment that works by binding to the ABL myristoyl pocket2. This novel mechanism of action, also known in scientific literature as a STAMP inhibitor, can help address resistance to TKI therapy in patients with CML and overcome mutations at the defective BCR-ABL1 gene, which is associated with the over-production of leukemic cells2-4. Scemblix continues to be studied across multiple lines of treatment for CML-CP3-12.
“We often see that sequential use of TKI treatments can be associated with increased failure rates and greater concerns regarding potential treatment side effects as patients move to later lines. Scemblix offers an increasingly proven option for patients living with CML who have previously tried two or more TKIs, and takes a different approach to targeted inhibition to better manage CML,” said Dr. Michael J. Mauro**, Hematologist and Myeloproliferative Neoplasms Program Leader at Memorial Sloan Kettering Cancer Center (MSK).
In this updated analysis, responses were also durable, with 60 out of 62 patients on Scemblix maintaining MMR at time of their last assessment1. Scemblix continued to deliver more favorable deep molecular responses (MRs) with MR4 and MR4.5 rates at 48 weeks of 10.8% and 7.6%, compared to 3.9% and 1.3% in patients treated with Bosulif, respectively1. Additionally, the cumulative proportion of patients achieving a level of BCR-ABL1IS ≤1% at 48 weeks – a predictor of better long-term outcomes in this heavily pretreated patient population – was higher in the Scemblix arm than in the Bosulif arm (50.8% vs 33.7%)1.
The most common reason for treatment discontinuation was lack of efficacy in 37 (23.6%) patients treated with Scemblix and 27 (35.5%) patients treated with Bosulif1. Median duration of exposure was 15.4 months (range, 0.0–37.3 months) for Scemblix and 6.8 months (range, 0.2–34.3 months) for Bosulif1. With a longer duration of exposure, the safety and tolerability profile remains consistent with the primary analysis of the ASCEMBL trial1-4. The most common (incidence ≥ 20%) adverse reactions reported in this analysis were thrombocytopenia (29.5%) and neutropenia (23.1%) in the Scemblix arm; and diarrhea (71.1%), nausea (46.1%), increased ALT (28.9%), vomiting (26.3%), rash (23.7%), increased AST (21.1%) and neutropenia (21.1%) in the Bosulif arm1.
“We are excited to see the continued benefit with Scemblix for this long-underserved patient population,” said Jeff Legos, Executive Vice President, Global Head of Oncology & Hematology Development at Novartis. “These data are encouraging as we continue to challenge the current standard of care in CML by exploring if and how Scemblix can help more patients living with this disease.”
Scemblix received FDA approval in October 2021 and is currently available for physicians to prescribe to appropriate patients in the US2. Scemblix is also being evaluated in studies across multiple treatment lines and indications for CML-CP, including the ASC4FIRST Phase III study for newly diagnosed adult patients, as well as in a Phase Ib/II dose assessment study in pediatric patients with Ph+ CML-CP. Trial-in-progress posters for both are being presented at ASH13-22.
To learn more about our long-standing commitment to transforming the lives of patients with CML with bold science, the latest information from Novartis and access to our ASH 2021 scientific presentations, visit the Novartis Oncology Congress Hub at https://www.hcp.novartis.com/virtual-congress/ash-2021/.
About Scemblix® (asciminib)
Scemblix (asciminib) is indicated for the treatment of adult patients with Ph+ CML-CP pre-treated with two or more TKIs, as well as adult patients with Ph+ CML-CP with the T315I mutation. The first indication is approved under the US FDA Accelerated Approval Program based on MMR rate at 24 weeks; continued approval for the first indication may be contingent upon verification and description of clinical benefit from confirmatory evidence2.
Scemblix is the first FDA-approved CML treatment that binds to the ABL myristoyl pocket2. This novel mechanism of action, also known in scientific literature as a STAMP inhibitor, can help address resistance in patients with CML previously treated with two or more TKIs and overcome mutations at the defective BCR-ABL1 gene, which is associated with the over-production of leukemic cells3-12.
Novartis has initiated regulatory filings for Scemblix in multiple countries and regions across the globe.
Scemblix represents an important development for patients who experience resistance and/or intolerance to currently available TKI therapies, and it is being studied across multiple treatment lines for CML-CP3-20. Specifically, the ASC4FIRST Phase III study (NCT04971226) evaluates Scemblix as a first-line treatment and is in the recruitment phase14,21.
About Novartis Commitment to CML
Novartis has a long-standing scientific commitment to patients living with CML. For more than 20 years, our bold science has helped transform CML into a chronic disease for many patients. Despite these advancements, we’re not standing still. We continue to research ways to target the disease, seeking to address the challenges with treatment resistance and/or intolerance that many patients face. Novartis also continues to reimagine CML care through its commitment to sustainable access for patients and collaboration with the global CML community.
SCEMBLIX® (asciminib) tablets is a prescription medicine used to treat adults with Philadelphia chromosome-positive chronic myeloid leukemia (Ph+ CML) in chronic phase (CP), previously treated with 2 or more tyrosine kinase inhibitor (TKI) medicines. The effectiveness of SCEMBLIX in these patients is based on a study that measured major molecular response (MMR) rates. No clinical information is available to show if these patients treated with SCEMBLIX live longer or if their symptoms improve. Ongoing studies exist to find out how SCEMBLIX works over a longer period of time.
SCEMBLIX is also approved for use in adults with Ph+ CML in CP with the T315I mutation.
It is not known if SCEMBLIX is safe and effective in children.
Important Safety Information
SCEMBLIX® (asciminib) tablets may cause low platelet counts (thrombocytopenia), low white blood cell counts (neutropenia), and low red blood cell counts (anemia). Patients should tell their doctor right away if they have unexpected bleeding or easy bruising; blood in their urine or stools; fever; or any signs of an infection. SCEMBLIX may increase enzymes in the patient’s blood called amylase and lipase, which may be a sign of inflammation of the pancreas (pancreatitis). Patients should tell their doctor right away if they have sudden stomach-area pain or discomfort, nausea, or vomiting. During treatment with SCEMBLIX, doctors may check their patients’ blood pressure and treat any high blood pressure as needed. Patients should tell their doctor if they develop elevated blood pressure or symptoms of high blood pressure including confusion, headaches, dizziness, chest pain, or shortness of breath.
If a patient has an allergic reaction while on SCEMBLIX, they should stop taking SCEMBLIX and get medical help right away. Signs or symptoms of an allergic reaction include trouble breathing or swallowing; feeling dizzy or faint; swelling of the face, lips, or tongue; fever; skin rash or flushing; or a fast heartbeat. SCEMBLIX may cause heart and blood vessel problems, including heart attack; stroke; blood clots or blockage of patient’s arteries; heart failure; and abnormal heartbeat which can be serious and may sometimes lead to death. These heart and blood vessel problems can happen in people with risk factors or a history of these problems and/or previously treated with multiple TKI medicines. Patients should tell their doctor right away if they get shortness of breath; chest pain or pressure; a feeling like their heart is beating too fast or they feel abnormal heartbeats; swelling in their ankles or feet; dizziness; weight gain; numbness or weakness on one side of their body; decreased vision or loss of vision; trouble talking; pain in their arms, legs, back, neck, or jaw; headache; or severe stomach-area pain.
Before taking SCEMBLIX, patients should tell their doctor about all of their medical conditions, including if they have a history of pancreatitis; a history of heart problems; or blood clots in their arteries and veins (types of blood vessels). SCEMBLIX can harm an unborn baby. Women should tell their doctor right away if they become pregnant or think they may be pregnant during treatment with SCEMBLIX. Women who are able to become pregnant should have a pregnancy test before they start SCEMBLIX and should use effective birth control during treatment and for 1 week after the last dose of SCEMBLIX. Women should not breastfeed during treatment and for 1 week after their last dose of SCEMBLIX.
Patients should tell their doctor about all the medicines they take, including prescription medicines, over-the-counter medicines, vitamins, and herbal supplements. SCEMBLIX and other medicines may affect each other, causing side effects. The most common side effects of SCEMBLIX include nose, throat, or sinus (upper respiratory tract) infections; muscle, bone, or joint pain; rash; tiredness; nausea; and diarrhea. The most common blood test abnormalities include decreased blood counts of platelets, white blood cells, and red blood cells; and increased blood levels of triglycerides, creatine kinase, liver enzymes, or pancreas enzymes (amylase and lipase).
Please see full Prescribing Information for SCEMBLIX, available at https://www.novartis.us/sites/www.novartis.us/files/scemblix.pdf.
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* Bosulif is a registered trademark of Pfizer.
** Disclosure: Dr. Mauro has provided consulting services to Novartis.
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