BeyondSpring Reports 2024 Year-End Financial Results and Highlights Key Clinical & Strategic Milestones

• Plinabulin Final Phase 3 Data Published in The Lancet Respiratory Medicine, Demonstrating Overall Survival Benefit in 2L/3L NSCLC EGFR Wild Type vs. Docetaxel
• Plinabulin Phase 2 Data Highlights Potential to Resensitize Tumors Progressed on PD-1/PD-L1 Inhibitors in Metastatic NSCLC
• SEED Therapeutics Enters into Targeted Protein Degradation Research Collaboration with Eisai with potential payment to SEED of up to $1.5 Billion and Completes $24 Million First Close of Series A-3 Financing
• SEED Therapeutics' Lead Oncology Asset RBM39 Degrader Granted Rare Pediatric Disease and Orphan Drug Designations by the FDA

"2024 was a pivotal year for BeyondSpring, with significant clinical progress for our first-in-class agent Plinabulin and strategic advancements for SEED Therapeutics (SEED), which BeyondSpring co-founded and owns an equity stake in. We believe these developments create value benefiting all stakeholders,” said Dr. Lan Huang, Co-Founder, Chairman, and CEO of BeyondSpring.

"Plinabulin demonstrated a statistically significant survival benefit in patients with second- and third-line non-small cell lung cancer (NSCLC) (EGFR wild-type), a setting where no new therapies have been approved in over a decade. This Phase 3 data, now published in The Lancet Respiratory Medicine, strengthens our regulatory strategy as we prepare for submission to the Chinese National Medical Products Administration (NMPA) and potentially regulatory authorities in other jurisdictions.”

"BeyondSpring is also advancing Plinabulin's potential as a next-generation immuno-oncology agent, with its potent effect in dendritic cell maturation. An ongoing Phase 2 study showed that Plinabulin, in combination with a PD-1 inhibitor and docetaxel, produced promising efficacy in patients with metastatic NSCLC who had progressed on prior PD-1/PD-L1 inhibitors with good tolerability. While PD-1 and PD-L1 antibody annual sales have exceeded $50 billion, with most sales coming from lung cancer, 60% of patients across multiple cancer indications develop acquired resistance to checkpoint inhibitors, which we believe represents a significant opportunity for Plinabulin to impact the treatment landscape and create substantial value.”

"SEED also made significant progress in 2024, securing a strategic research collaboration with Eisai Co., Ltd. ("Eisai”), a second global pharma partnership in addition to the Eli Lilly and Company ("Lilly”) partnership. Under this collaboration, SEED will be eligible to receive upfront payments and potential preclinical, clinical, regulatory and sales milestone payments of up to $1.5 billion, plus tiered royalties on net sales. In parallel, SEED is advancing its internal lead oncology asset, RBM39 degrader, toward clinical development. SEED's recognition in two Nature review papers as a leader in targeted protein degradation (TPD), along with recent granting of Rare Pediatric Disease and Orphan Drug Designations by the FDA for its RBM39 degrader ST-01156, further underscore its unique platform and reinforce its leadership in this emerging field.”

"With strongly anchored pipelines, key global partnerships and deliberate plans to navigate regulatory pathways, we believe BeyondSpring and SEED are well-positioned to drive transformative advancements in oncology and TPD in 2025,” Dr. Lan Huang concluded.

Recent Clinical and Business Updates

Plinabulin Clinical Updates

• Plinabulin Phase 3 Data Published in The Lancet Respiratory Medicine and Presented at the IASLC 2024 conference
  • Demonstrated a statistically significant overall survival, PFS and ORR benefit in second- and third-line NSCLC (EGFR wild-type) compared to standard-of-care docetaxel.
  • Supports planned regulatory submissions to NMPA and potentially regulatory authorities in other jurisdictions.
• Plinabulin Combination Therapy in multiple cancers which failed PD-1/PD-L1 therapies at MD Anderson Cancer Center
  • Phase 1 investigator-initiated study of Plinabulin + PD-1/PD-L1 inhibitor + radiation showed encouraging data in re-sensitizing NSCLC, Head and Neck cancer, and Hodgkin's Lymphoma.
  • Responding patients showed dendritic cell maturation.
• Plinabulin Combination Therapy in NSCLC
  • Ongoing Phase 2 investigator-initiated study (Study 303) of Plinabulin + PD-1 inhibitor + Docetaxel showed encouraging efficacy and safety outcomes in metastatic NSCLC patients who had progressed on prior PD-1/PD-L1 inhibitors.
  • Supports Plinabulin's potential to resensitize tumors to checkpoint inhibitors.
• Other Ongoing Clinical Trial
  • Enrolled first patient in a Phase 2 investigator-initiated study (Study 302) of Plinabulin + PD-1 inhibitor + Etoposide/Platinum (EP) for first-line extensive-stage small-cell lung cancer (ES-SCLC).

• Entered into definitive agreements to sell a portion of BeyondSpring's Series A-1 Preferred Shares of SEED for gross proceeds of approximately $35.4 million to advance late-stage clinical development of Plinabulin. First closing of approximately $7.35 million completed in February 2025.

• Strategic Collaborations & Financing
  • Research collaboration with Eisai to develop molecular glue degraders for oncology and neurodegenerative diseases with potential payments to SEED of up to $1.5 billion.
  • $24 million Series A-3 financing first close, led by Eisai.
  • Achieved third milestone with Lilly R&D collaboration.
• Industry Recognition & FDA Designations
  • SEED was recognized in two Nature review articles as a leading company in TPD.
  • Received Rare Pediatric Disease and Orphan Drug Designations from the FDA for RBM39 degrader ST-01156, reinforcing its potential as a breakthrough therapy for hard-to-treat cancers.

Continuing operations:

• R&D expenses: $2.6 million (vs. $7.3 million in 2023), reflecting completion of Plinabulin Dublin-3 and Protective Studies.
• G&A expenses: $6.1 million (vs. $7.8 million in 2023), driven by cost optimization measures.
• Net loss: $8.9 million (vs. $14.0 million in 2023).
• Cash, cash equivalents, and short-term investments: $2.9 million as of December 31, 2024.

• Net loss: $7.8 million (vs. $7.9 million in 2023).
• Current assets: $25.3 million as of December 31, 2024.

Plinabulin

• 1H 2025: Updated data from Phase 2 of Study 303 in metastatic NSCLC progressed on PD-1/PD-L1 inhibitors.
• 2H 2025: Preliminary data from Phase 2 of Study 302 in 1L ES-SCLC.

• Mid-2025: Expected IND filing of RBM39 degrader.
• 2H 2025: RBM39 degrader expected to begin patient enrollment.
• 2H 2025: Tau degrader expected to achieve in vivo efficacy.

About BeyondSpring

BeyondSpring (NASDAQ: BYSI) is a clinical-stage biopharmaceutical company developing first-in-class therapies for high unmet medical needs. Its lead asset, Plinabulin, is in late-stage clinical development as an anti-cancer agent in NSCLC and a range of cancer indications. Plinabulin's novel mechanism of action as a dendritic cell maturation agent supports both anti-cancer activity and immune modulation, offering a unique approach to resensitizing tumors to checkpoint inhibitors. Learn more at beyondspringpharma.com.

About SEED Therapeutics

SEED Therapeutics is a biotech company pioneering targeted protein degradation (TPD). Its proprietary RITE3™ platform is advancing novel molecular glue degraders across oncology, neurodegeneration, immunology, and virology. SEED collaborates with Eli Lilly and Company and Eisai Co., Ltd. and is advancing its RBM39 degrader into clinical development. Learn more at seedtherapeutics.com.

Cautionary Note Regarding Forward-Looking Statements

This press release includes forward-looking statements that are not historical facts. Words such as "will,” "expect,” "anticipate,” "plan,” "believe,” "design,” "may,” "future,” "estimate,” "predict,” "objective,” "goal,” or variations thereof and variations of such words and similar expressions are intended to identify such forward-looking statements. Forward-looking statements are based on BeyondSpring's current knowledge and its present beliefs and expectations regarding possible future events and are subject to risks, uncertainties, and assumptions. Actual results and the timing of events could differ materially from those anticipated in these forward-looking statements as a result of several factors including, but not limited to, difficulties raising the anticipated amount needed to finance the Company's future operations on terms acceptable to the Company, if at all, unexpected results of clinical trials, delays or denial in regulatory approval process, results that do not meet the Company's expectations regarding the potential safety, the ultimate efficacy or clinical utility of the Company's product candidates, increased competition in the market, the Company's ability to meet Nasdaq's continued listing requirements, and other risks described in BeyondSpring's most recent Form 10-K on file with the U.S. Securities and Exchange Commission. All forward-looking statements made herein speak only as of the date of this release and BeyondSpring undertakes no obligation to update publicly such forward-looking statements to reflect subsequent events or circumstances, except as otherwise required by law.

Investor Contact: IR@beyondspringpharma.com

Media Contact: PR@beyondspringpharma.com

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