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Crescent Biopharma announces transformational partnership with Kelun-Biotech and $185M private placement, accelerating and expanding global pipeline of next generation therapeutics for solid tumors

CST Updated Dec 05, 2025 16:34

On December 4, 2025, Crescent Biopharma, Inc. ("Crescent") (Nasdaq: CBIO), a biotechnology company dedicated to rapidly advancing the next wave of therapies for cancer patients, announced an exclusive partnership with Sichuan Kelun-Biotech Biopharmaceutical Co., Ltd. ("Kelun-Biotech") and a comprehensive pipeline update, as well as a $185 million private placement, which is expected to close on or about December 8, 2025, subject to satisfaction of customary closing conditions.


"We're excited to share the tremendous progress we've made executing on our strategy of building a robust portfolio of next generation oncology therapeutics," said Joshua Brumm, chief executive officer of Crescent. "CR-001, our PD-1 x VEGF bispecific antibody, has the potential to be a foundational immuno-oncology backbone and the partnership we announced with Kelun-Biotech today has enhanced our pipeline of ADCs and accelerated our efforts to deliver potentially best-in-class novel combination therapies. Crescent is now poised to have three distinct programs entering the clinic in 2026 and multiple data readouts anticipated from both monotherapy and novel combination therapy studies by the end of 2027. Additionally, the financing we announced today with leading healthcare investors strengthens our balance sheet, providing anticipated cash runway through multiple key inflection points. Our comprehensive update today underscores Crescent's commitment to deliver on our vision of building the next leading biotech oncology company."


Kelun-Biotech and Crescent Strategic Partnership


In a separate release, Kelun-Biotech and Crescent announced a strategic partnership to develop and commercialize next generation oncology therapeutics, including novel combinations. The partnership involves Crescent's CR-001, a PD-1 x VEGF bispecific antibody, and Kelun-Biotech's SKB105 (also known as CR-003), an integrin beta-6 (ITGB6)-directed antibody-drug conjugate (ADC) with a topoisomerase payload.

Under the terms of the collaboration, Crescent has granted Kelun-Biotech exclusive rights to research, develop, and commercialize CR-001 in Greater China (including mainland China, Hong Kong, Macau and Taiwan). In addition, Kelun-Biotech has granted Crescent exclusive rights to research, develop, and commercialize SKB105 (CR-003) in the United States, Europe and all markets outside of Greater China. The partnership includes the development of these candidates as monotherapies, and also the evaluation of CR-001 in combination with SKB105 (CR-003). Both Crescent and Kelun-Biotech have the right to independently develop CR-001 in additional combinations, including combinations of CR-001 with proprietary ADC pipeline assets.


Key Pipeline Updates


CR-001, a PD-1 x VEGF bispecific antibody

  • CR-001 is a tetravalent bispecific antibody being developed for the treatment of solid tumors that combines two complementary, validated mechanisms in oncology via a blockade of PD-1 and VEGF. It was intentionally designed to replicate the cooperative pharmacology of ivonescimab, which demonstrated superior efficacy results compared to the current market leader, pembrolizumab, in a large, third-party Phase 3 trial in non-small cell lung cancer.1 Because of this similar cooperativity, there is the opportunity for rapid and efficient clinical development for CR-001 as Crescent pursues both first-in-class and fast-follower solid tumor indications.

  • Crescent is on track to initiate a global Phase 1/2 clinical trial of CR-001 in patients with solid tumors in the first quarter of 2026. The trial is designed to enroll both treatment-naïve and previously-treated patients with multiple solid tumor types, including non-small cell lung cancer and various gastrointestinal and gynecological tumors. The trial plans to include dose-escalation, back-fill and dose-optimization cohorts to enable robust assessment of the clinical profile of CR-001. Crescent anticipates reporting proof-of-concept clinical data from the Phase 1/2 trial of CR-001 in the first quarter of 2027, including safety, pharmacokinetic, pharmacodynamic and early anti-tumor activity.

  • CR-001's anti-VEGF activity may normalize the vasculature at the tumor site, which has the potential to improve the localization and effectiveness of combination therapies, such as the planned administration of CR-001 with ADCs. The partnership with Kelun-Biotech accelerates the scope and number of combination studies planned with CR-001 as a potential foundational immuno-oncology backbone. Crescent plans to evaluate CR-001 in combination with multiple ADCs, including CR-002 and CR-003 (SKB105), with initial combination data expected by year-end 2027.


CR-002, topoisomerase inhibitor ADC targeting PD-L1

  • CR-002 is a topoisomerase inhibitor ADC directed to PD-L1, a validated target known to have high expression in multiple solid tumors. CR-002 incorporates a PD-L1 antibody selected for high internalization to facilitate payload release in target cells and a linker designed for intracellular cleavage and high stability in circulation.

  • Crescent is on track to submit an Investigational New Drug Application (IND) to the U.S. Food and Drug Administration for CR-002 in mid-2026 to support the initiation of a Phase 1/2 trial in solid tumors in the second half of 2026, with proof-of-concept data expected in the second half of 2027.


CR-003 (SKB105), topoisomerase inhibitor ADC targeting Integrin beta-6

  • CR-003 (SKB105), discovered by Kelun-Biotech, is a topoisomerase inhibitor ADC directed to integrin beta-6 (ITGB6), which is overexpressed in many solid tumors with minimal expression in most normal tissues. CR-003 (SKB105) consists of an anti-ITGB6 fully human IgG1 monoclonal antibody conjugated via a stable, clinically validated cleavable linker. CR-003 (SKB105) demonstrated a favorable efficacy, safety, and pharmacokinetic (PK) profile in preclinical models.

  • Kelun-Biotech plans to initiate a Phase 1/2 trial of CR-003 (SKB105) in Greater China in the first quarter of 2026, with proof-of-concept data expected in the first quarter of 2027. A combination study of CR-003 and CR-001 is planned to initiate in the first half of 2027 with initial data anticipated by year-end 2027.


Pipeline Expansion Opportunities


Crescent also continues to pursue opportunities to advance its strategy in immuno-oncology and best-in-class ADC combinations through internal efforts and with leading partners, including Kelun-Biotech and Paragon Therapeutics.


Anticipated Milestones


First Quarter of 2026

  • Initiation of Phase 1/2 trial of CR-001

  • Initiation of Phase 1/2 trial of CR-003 (SKB105)


Second Half of 2026

  • Initiation of Phase 1/2 trial of CR-002

  • Initiation of the first Phase 1/2 ADC combination trial with CR-001


First Quarter of 2027

  • Proof-of-concept clinical data from Phase 1/2 trial of CR-001

  • Proof-of-concept clinical data from Phase 1/2 trial of CR-003 (SKB105)


First Half of 2027

  • Initiation of Phase 1/2 trial of CR-001 in combination with CR-003 (SKB105)


Second Half of 2027

  • Proof-of-concept clinical data from Phase 1/2 trial of CR-002


By Year-End 2027

  • Initial clinical data from first ADC combination Phase 1/2 trial with CR-001

  • Initial clinical data from Phase 1/2 trial of CR-001 in combination with CR-003 (SKB105)