Blueprint Medicines Presents Updated Part 1 Data from PIONEER Trial of Avapritinib Showing Robust Reductions in Cutaneous Disease Symptoms in Patients with Indolent Systemic Mastocytosis
SM is a rare disease driven by the KIT D816V mutation in nearly all patients and characterized by uncontrolled mast cell proliferation and activation. The disorder can lead to debilitating systemic, gastrointestinal and neurocognitive symptoms, including life-threatening anaphylaxis. Additional skin manifestations such as itching, flushing and pigmented skin lesions are common and can significantly impact quality of life. Avapritinib is a potent and highly selective inhibitor of D816V mutant KIT.
"Patients with indolent systemic mastocytosis often suffer from extensive skin lesions and severe mediator symptoms that can be life-threatening," said
"These promising data reinforce our commitment to rapidly advance development of avapritinib to meet persistent medical needs in indolent systemic mastocytosis, which are poorly addressed by a patchwork of available symptomatic therapies," said
The presentation is available on-demand via the
Highlights from the EAACI Presentation of PIONEER Trial Data
Previously reported data from part 1 of the PIONEER trial showed that treatment with avapritinib was well-tolerated and resulted in robust and clinically meaningful improvements on measures of mast cell burden, disease symptoms and patient-reported quality of life through 16 weeks. Based on these data, avapritinib 25 mg once daily (QD) was selected as the recommended part 2 dose. Updated data on disease symptoms through 24 weeks and new skin assessment results were reported in the EAACI presentation.
Updated clinical activity and safety data
As of a data cutoff date of
The updated data also showed a 60 percent response rate in patients treated with avapritinib 25 mg QD compared to a 0 percent response rate in patients treated with placebo at 24 weeks, with response defined as a 30 percent or greater reduction in ISM-SAF TSS. Based on these data and feedback from the
As of a data cutoff date of
Additional clinical activity data on measures of skin disease
High resolution skin photographs were taken at baseline and every 12 weeks during treatment for patients with significant cutaneous involvement who consented to photography. To assess changes in skin disease, photographs were assessed by a blinded independent review committee and a computational image analysis algorithm. Images and data as of a cutoff of
Based on skin photography at 24 weeks or the last available assessment, results showed that skin lesions lightened in 71 percent of patients treated with avapritinib (n=17; all doses) compared to 25 percent of patients treated with placebo (n=8), per blinded review by the independent committee. In addition, the median percent change from baseline in most affected surface area was -35 percent for avapritinib (n=18; all doses) compared to -8 percent for placebo (n=8), based on a computational image analysis algorithm.
Mast cell infiltration in skin lesions was also assessed by lesional skin biopsies obtained at baseline and 12 weeks. The median percent change from baseline in mast cell infiltration was -46 percent for avapritinib (n=18; all doses) compared to +51 percent for placebo (n=7).
Phase 1 Trial of BLU-263 in
SM is a rare disease driven by the KIT D816V mutation. Uncontrolled proliferation and activation of mast cells result in chronic, severe and often unpredictable symptoms for patients across the spectrum of SM. The vast majority of those affected have non-advanced (indolent or smoldering) SM, with debilitating symptoms that lead to a profound, negative impact on quality of life. A minority of patients have advanced SM, which encompasses a group of high-risk SM subtypes including aggressive SM, SM with an associated hematologic neoplasm and mast cell leukemia. In addition to mast cell activation symptoms, advanced SM is associated with organ damage due to mast cell infiltration and poor overall survival.
Debilitating symptoms associated with SM, including anaphylaxis, maculopapular rash, pruritis, brain fog, fatigue and bone pain, often persist despite treatment with a number of symptomatic therapies. Patients often live in fear of attacks, have limited ability to work or perform daily activities, or isolate themselves to protect against unpredictable triggers. Currently, there are no approved therapies that selectively inhibit D816V mutant KIT.
About AYVAKIT™ (avapritinib)
AYVAKIT™ (avapritinib) is a kinase inhibitor approved by the FDA for the treatment of adults with unresectable or metastatic gastrointestinal stromal tumor (GIST) harboring a PDGFRA exon 18 mutation, including PDGFRA D842V mutations. For more information, visit AYVAKIT.com.
Avapritinib is not approved for the treatment of any other indication, including SM, in the
Blueprint Medicines is developing avapritinib globally for the treatment of advanced, smoldering and indolent SM. The FDA granted Breakthrough Therapy Designation to avapritinib for the treatment of advanced SM, including the subtypes of aggressive SM, SM with an associated hematologic neoplasm and mast cell leukemia.
Blueprint Medicines has an exclusive collaboration and license agreement with CStone Pharmaceuticals for the development and commercialization of avapritinib and certain other drug candidates in Mainland China, Hong Kong, Macau and Taiwan. Blueprint Medicines retains development and commercial rights for avapritinib in the rest of the world.
About the Phase 2 PIONEER Trial
PIONEER is a randomized, double-blind, placebo-controlled, registration-enabling trial evaluating avapritinib in patients with indolent SM. The trial includes three parts: dose-finding part 1, registration-enabling part 2 and long-term treatment part 3. All patients who complete parts 1 or 2 will have an opportunity to continue to receive treatment with avapritinib in part 3. Key trial endpoints include the change in patient-reported disease symptoms as measured by the ISM-SAF TSS, patient-reported quality of life, quantitative measures of mast cell burden and safety. Part 1 has completed patient enrollment.
Patients and healthcare providers with questions about opportunities to participate in the PIONEER trial can contact the
Blueprint Medicines is a precision therapy company striving to improve human health. With a focus on genomically defined cancers, rare diseases and cancer immunotherapy, we are developing transformational medicines rooted in our leading expertise in protein kinases, which are proven drivers of disease. Our uniquely targeted, scalable approach empowers the rapid design and development of new treatments and increases the likelihood of clinical success. We have one FDA-approved precision therapy and are currently advancing multiple investigational medicines in clinical development, along with a number of research programs. For more information, visit www.BlueprintMedicines.com and follow us on Twitter (@BlueprintMeds) and LinkedIn.
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