Blueprint Medicines Announces Accelerated Regulatory Submission Plans and Recent Clinical Progress

Blueprint Medicines Corporation (NASDAQ: BPMC), a precision therapy company focused on genomically defined cancers, rare diseases and cancer immunotherapy, today announced plans to expedite development of avapritinib, BLU-667 and BLU-782 based on recent clinical progress and interactions with regulatory authorities.

"The updates we are announcing today for avapritinib, BLU-667 and BLU-782 represent the acceleration of multiple clinical-stage programs, including planned marketing applications for avapritinib and BLU-667, and highlight our commitment to executing a portfolio-based strategy," said Jeff Albers, Chief Executive Officer of Blueprint Medicines. "In addition, as we prepare to submit marketing applications for avapritinib for the treatment of PDGFRA-driven and fourth-line GIST in the United States in the second quarter and Europe in the third quarter, we are rapidly building global commercial capabilities to enable us to deliver this important new medicine, if approved, to patients in need."

Summary of Accelerated Regulatory Submission Plans and Recent Clinical Progress

Avapritinib: Gastrointestinal Stromal Tumors (GIST)

Blueprint Medicines now plans to submit a Marketing Authorization Application (MAA) to the European Medicines Agency (EMA) for avapritinib for the treatment of both PDGFRα D842V mutant GIST and fourth-line GIST in the third quarter of 2019.

Avapritinib: Advanced Systemic Mastocytosis (SM)

Blueprint Medicines now plans to submit a New Drug Application (NDA) to the U.S. Food and Drug Administration (FDA) for avapritinib for the treatment of advanced SM in the first quarter of 2020, subject to continuing discussions with the FDA under its breakthrough therapy program to determine the required clinical data for an NDA submission.

BLU-667: RET-Altered Cancers

Top-line interim data from the Phase 1 ARROW clinical trial of BLU-667 for patients with RET-fusion non-small cell lung cancer (NSCLC) and RET-mutant medullary thyroid cancer (MTC) who were response evaluable and treated at the recommended Phase 2 dose of 400 mg once daily, as of November 14, 2018 with follow-up through a data cutoff date of March 1, 2019, showed the following:

In 34 patients with RET-fusion NSCLC previously treated with platinum-based chemotherapy, the overall response rate (ORR) was 62 percent.(1)

In 16 patients with RET-mutant MTC previously treated with the approved multi-kinase inhibitors cabozantinib and/or vandetanib, the ORR was 63 percent.(2)

BLU-667 was generally well-tolerated, and most adverse events (AEs) reported by investigators were mild or moderate (Grade 1 or 2). Across all doses and treatment cohorts (n=217), only eight patients discontinued treatment with BLU-667 due to treatment-related AEs, with one Grade 5 AE (pneumonia/lung infection) determined by the investigator to be possibly related to BLU-667.

Detailed clinical safety and efficacy data from the ARROW trial in RET-fusion NSCLC patients and RET-mutant MTC patients have been submitted for presentation at the American Society of Clinical Oncology Annual Meeting in June 2019.

The enrollment target has been reached and patient screening is now closed for the registration-enabling ARROW trial cohort for patients with previously treated RET-fusion NSCLC. Blueprint Medicines anticipates reaching the enrollment target for the registration-enabling ARROW trial cohort for patients with previously treated MTC in the second quarter of 2019.

Based on the early achievement of the enrollment target for the RET-fusion NSCLC cohort, Blueprint Medicines now plans to submit an NDA to the FDA for BLU-667 for the treatment of patients with NSCLC previously treated with platinum-based chemotherapy in the first quarter of 2020. Blueprint Medicines continues to expect to submit an NDA to the FDA for BLU-667 for the treatment of patients with RET-mutant MTC previously treated with an approved multi-kinase inhibitor in the first half of 2020.

BLU-782: Fibrodysplasia Ossificans Progressiva (FOP)

Based on the progress of the ongoing Phase 1 clinical trial in healthy volunteers and input from clinical experts, Blueprint Medicines now plans to initiate a Phase 2a clinical trial of BLU-782 in patients with FOP in the fourth quarter of 2019.

Footnotes:
(1)  95 percent confidence interval (CI): 44-78 percent; five responses pending confirmation.
(2)  95 percent CI: 35-85 percent; three responses pending confirmation.

About Blueprint Medicines

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 are currently advancing four investigational medicines in clinical development, along with multiple research programs.

Cautionary Note Regarding Forward-Looking Statements

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, as amended, including, without limitation, statements regarding plans and timelines for the development of avapritinib,  BLU-667 and BLU-782; plans and timelines for submitting an MAA to the EMA for avapritinib for the treatment of PDGFRα D842V mutant GIST and fourth-line GIST; plans and timelines for submitting an NDA to the FDA for BLU-667 for the treatment of patients with NSCLC previously treated with platinum-based chemotherapy; plans and timelines for submitting an NDA to the FDA for BLU-667 for the treatment of patients with RET-mutant MTC previously treated with an approved multi-kinase inhibitor; plans and timelines for presenting additional data from the ongoing ARROW trial for BLU-667; plans and timelines for initiating a Phase 2a clinical trial of BLU-782 in patients with FOP; and Blueprint Medicines' strategy, business plans and focus. The words "may," "will," "could," "would," "should," "expect," "plan," "anticipate," "intend," "believe," "estimate," "predict," "project," "potential," "continue," "target" and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Any forward-looking statements in this press release are based on management's current expectations and beliefs and are subject to a number of risks, uncertainties and important factors that may cause actual events or results to differ materially from those expressed or implied by any forward-looking statements contained in this press release, including, without limitation, risks and uncertainties related to the delay of any current or planned clinical trials or the development of Blueprint Medicines' drug candidates, including avapritinib,  BLU-667, BLU-554 and BLU-782; Blueprint Medicines' advancement of multiple early-stage efforts; Blueprint Medicines' ability to successfully demonstrate the safety and efficacy of its drug candidates; the preclinical and clinical results for Blueprint Medicines' drug candidates, which may not support further development of such drug candidates; actions of regulatory agencies, which may affect the initiation, timing and progress of clinical trials; Blueprint Medicines' ability to develop and commercialize companion diagnostic tests for its current and future drug candidates, including companion diagnostic tests for avapritinib for PDGFRα D842V-driven GIST, BLU-667 for RET-driven NSCLC and BLU-554 for FGFR4-driven hepatocellular carcinoma; the success of Blueprint Medicines' current and future collaborations, including its cancer immunotherapy collaboration with F. Hoffmann-La Roche Ltd and Hoffmann-La Roche Inc. and its collaboration with CStone Pharmaceuticals. These and other risks and uncertainties are described in greater detail in the section entitled "Risk Factors" in Blueprint Medicines' Annual Report on Form 10-K for the quarter ended December 31, 2018, as filed with the Securities and Exchange Commission (SEC) on February 26, 2019, and any other filings that Blueprint Medicines has made or may make with the SEC in the future. Any forward-looking statements contained in this press release represent Blueprint Medicines' views only as of the date hereof and should not be relied upon as representing its views as of any subsequent date. Except as required by law, Blueprint Medicines explicitly disclaims any obligation to update any forward-looking statements.

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