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Blueprint Medicines and CStone Pharmaceuticals Announce Exclusive Collaboration and License Agreement to Develop and Commercialize Avapritinib, BLU-554 and BLU-667 in Greater China

Blueprint Medicines Corporation (NASDAQ: BPMC), a leader in discovering and developing targeted kinase medicines for patients with genomically defined diseases, and CStone Pharmaceuticals, a privately-held biopharmaceutical company devoted to developing a new generation of innovative drugs, today announced an exclusive collaboration and license agreement for the development and commercialization of avapritinib, BLU-554 and BLU-667 in Mainland China, Hong Kong, Macau and Taiwan, either as monotherapies or combination therapies. Discovered and developed by Blueprint Medicines, avapritinib, BLU-554 and BLU-667 are potent and highly selective investigational kinase medicines that have each demonstrated clinical proof-of-concept in genomically defined subsets of patients with cancer. Blueprint Medicines will retain all rights to the licensed products in the rest of the world.

The collaboration strengthens CStone Pharmaceuticals' portfolio with exclusive rights in the territory to three clinical-stage targeted therapies and expands Blueprint Medicines' global efforts to address patient populations with high unmet needs. CStone Pharmaceuticals will lead clinical development of the licensed products in the territory by leveraging its regulatory expertise and broad local network, with the goal of commercializing the licensed products in the territory either as monotherapies or combination therapies. In addition, the companies plan to initiate a proof-of-concept clinical trial in China evaluating BLU-554 in combination with CS1001, a clinical-stage anti-programmed death ligand-1 (PD-L1) immunotherapy being developed by CStone Pharmaceuticals, as a first-line therapy for patients with hepatocellular carcinoma (HCC).

"Founded by seasoned executives with deep global and regional development experience and with a growing portfolio of potentially complementary cancer therapies, CStone Pharmaceuticals is an ideal partner in China," said Jeff Albers, Chief Executive Officer of Blueprint Medicines. "With recent regulatory reforms in China and the emergence of innovative companies like CStone Pharmaceuticals, we believe this forward-looking collaboration has the potential to expand our ability to address significant patient needs in Greater China while supporting global development of avapritinib, BLU-554 and BLU-667. In particular, we are excited to announce the expansion of the BLU-554 clinical development program in China, where more than half of all new cases of hepatocellular carcinoma worldwide occur each year."

"We are thrilled to enter into this collaboration with Blueprint Medicines, a leader in the discovery and development of highly selective kinase medicines, as the first step in a potentially long-term strategic partnership," said Frank Jiang, Chief Executive Officer of CStone Pharmaceuticals. "Based on the compelling clinical data reported to date, we believe Blueprint Medicines'