On August 25, 2025 BeOne Medicines Ltd. (Nasdaq: ONC; HKEX: 06160; SSE: 688235), a global oncology company, reported it has entered into an agreement to sell its royalty rights on the worldwide sales, excluding China, of Amgen’s IMDELLTRA (tarlatamab-dlle) for up to $950 million to Royalty Pharma (Nasdaq: RPRX) (Press release, BeOne Medicines, AUG 25, 2025, View Source [SID1234655452]).
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Under the terms of the agreement, BeOne will receive an upfront payment of $885 million, with the option to sell remaining royalties within 12 months for up to $65 million. BeOne will share in a portion of the royalty on annual sales above $1.5 billion, and will maintain royalty and all other rights to other assets under the terms of the existing collaboration with Amgen, including xaluritamig, a first-in-class STEAP1 x CD3 XmAb currently being studied in patients with metastatic castration-resistant prostate cancer (mCRPC).
IMDELLTRA is a first-in-class immunotherapy that binds to both DLL3 on tumor cells and CD3 on T cells, activating T cells to kill DLL3-expressing cells. IMDELLTRA is approved in the United States for patients with extensive-stage small cell lung cancer (ES-SCLC) who have progressed on or after receiving platinum-based chemotherapy.
"Today’s announcement is testament to the value of our long-term collaboration with Amgen, the developer of IMDELLTRA, who recognized the potential of BeOne in advancing their oncology pipeline," said John V. Oyler, Co-Founder, Chairman and CEO of BeOne. "In the five years since entering into this collaboration, we have executed with purpose in advancing our mission to deliver multiple transformative medicines to more patients worldwide."
"This agreement meaningfully accelerates value realization for BeOne, while preserving continued participation in the long-term potential of IMDELLTRA," said Aaron Rosenberg, Chief Financial Officer, BeOne. "A strong balance sheet is a hallmark of the most successful companies in our industry, and this transaction provides increased operational and strategic flexibility as we continue to execute our business strategy for the long term."
About IMDELLTRA (tarlatamab-dlle)
IMDELLTRA is a first-in-class immunotherapy that binds to both DLL3 on tumor cells and CD3 on T cells, activating T cells to kill DLL3-expressing cells. This results in the formation of a cytolytic synapse with lysis of the cancer cell. DLL3 is a protein that is expressed on the surface of SCLC cells in the vast majority of patients with SCLC, but is minimally expressed on healthy cells, making it an exciting target.
Tarlatamab is being investigated in multiple studies including DeLLphi-303, a Phase 1b study evaluating tarlatamab in combination with standard of care therapies in first-line ES-SCLC; DeLLphi-304, a randomized Phase 3 trial comparing tarlatamab monotherapy with standard of care chemotherapy in second-line treatment of ES-SCLC; DeLLphi-306, a randomized placebo-controlled Phase 3 trial of tarlatamab following concurrent chemoradiotherapy in limited-stage SCLC; DeLLphi-308, a Phase 1b study evaluating subcutaneous tarlatamab in second line or later ES-SCLC; and DeLLphi-309, a Phase 2 study evaluating alternative intravenous dosing regimens with tarlatamab in second-line ES-SCLC.