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POLB 001 has the potential to expand administration of cancer immunotherapies from centralised specialist cancer centres into community hospitals by making the treatment safer through the prevention of the life-threatening side effect, Cytokine Release Syndrome (CRS). As such, POLB 001 could increase the number of patients that can receive these life-saving treatments, thereby increasing the market opportunity.
An effective preventative therapy for cancer immunotherapy-induced CRS, has an estimated market opportunity of >US$10B in relapsed/refractory multiple myeloma and diffuse large B-cell lymphoma alone.
POLB 001 has demonstrated a compelling safety and efficacy profile in both preclinical and clinical settings and in May 2025, the FDA granted Orphan Drug Designation to POLB 001 as an oral preventative therapy for T-cell engager bispecific antibody-induced CRS.
A Phase 2a clinical trial is aims to investigate the safety and efficacy of POLB 001, in particular its ability to reduce the incidence of CRS, in approximately 30 relapsed/refractory multiple myeloma patients receiving an approved bispecific antibody. Interim data is expected Summer 2026.
Effective preventative therapy represents a market opportunity exceeding US$10B1
Navigate POLB 001:
Significant Market Opportunity in a Rapidly Growing Field
CRS is a major issue and rate limiting in delivering cancer immunotherapies
- No approved therapy for CRS prevention & few approved for CRS management
- The need for effective CRS management is being driven by rapid growth of CRS-inducing immunotherapies
- Bispecific antibody and CAR T therapy market expected to grow exponentially
Bispecific Antibodies & CAR T Therapies4,5,6
POLB 001 – potential first approved preventative therapy for cancer immunotherapy-induced CRS
Significant opportunity exists for POLB 001 as CRS preventative for bispecific antibody & CAR T treatment3
1st, 2nd and 3rd line+ Multiple Myeloma (MM) and Diffuse Large B-Cell Lymphoma (DLBCL) patients in the US and EU5, receive CAR T and bispecific antibody therapy7
An effective preventative therapy for CRS could enable outpatient administration and broader uptake of cancer immunotherapies8
Potential across additional haematological malignancies, solid tumours and new areas like severe influenza
Potential to Greatly Enhance Uptake of bispecific antibody and CAR T Therapies
Effective prevention of CRS by POLB 001 may enable broader access to cancer immunotherapies
*CRS prevention may contribute to bottleneck removal. Other issues, such as manufacturing, supply and other adverse events, may also present barriers to wider uptake.
Key Opinion Leaders Supportive of POLB 001’s Significant Potential
Dr Martin Kaiser, Consultant Haemato-Oncologist The Institute of Cancer Research & Royal Marsden Hospital discusses CRS and its impact on cancer immunotherapy administration
August 2025
“Bispecific antibodies will only be delivered in specialist cancer centres until there is a way to make treatment safe enough to extend them to a much wider patient population.”
Prof Gareth Morgan, myeloma specialist, US
“If there was a therapy that was orally delivered, a whole lot of infrastructure requirement falls away.”
Prof Martin Kaiser, myeloma specialist, UK
POLB 001 Scientific & Supporting Data
Potent and Selective Inhibition of p38 MAPK Signaling
Effective target engagement demonstrated in LPS human challenge trial
Levels of phosphorylated p38 MAPK in circulating monocytes
- POLB 001 was widely distributed
- POLB 001 inhibited p38 MAPK activation, direct measurement of activation
- POLB 001 inhibited in vivo and ex vivo responses to LPS-induced TNF-α, indirect measurement p38 activity
Blood samples were taken before and after administration of intravenous LPS. Peripheral blood samples were analysed by flow cytometry. Monocytes were gated by FSC, SSC and CD14+. Data is presented as mean MFI values of phospho-p38 +/- SEM
Reduced Key Inflammatory Cytokines Following LPS Challenge
Dose dependent reductions, without ablation of immune system, leaving key immune functions intact
TNF-α
TNF-α reduction of 73.5% and 56.2% seen for 70 mg and 150 mg doses respectively (p = 0.0003†)
IL-6
IL-6 reduction of 57.4% and 63.5% seen for 70 mg and 150 mg doses respectively (p = 0.0002†)
IL-8
IL-8 reduction of 80.7% and 76.7% seen for 70 mg and 150 mg doses respectively (p < 0.0001†)
TNF-α, IL-6 and IL-8 levels decreased between 56-81% in subjects treated with 70 mg or 150 mg POLB 001 twice daily
†The exploratory analysis suggested statistically significant improvement in treatment (p<0.05) for the endpoints examined.
Reduced Key Indicators of LPS-Induced Systemic Inflammation
The reduction of systemic cytokines align with improvement in clinically meaningful endpoints
Mean Body Temperature
No significant effect on body temperature with a trend towards reduction compared to placebo
Heart Rate Rise (bpm)
Suppressed increase in heart rate following IV LPS administration
C-Reactive Protein (CRP)
CRP level reductionof 33.1% and 33.3% seen for 70mg and 150mg doses respectively
POLB 001 Prevented CRS in Humanised Mouse Model
Highly effective and superior to a TNF-α antibody in a gold standard model of CRS
CRS Scores
POLB 001 prevented CRS symptoms*
CRS Biomarkers
POLB 001 decreased all key CRS biomarkers tested
The experimental model is a previously validated CD28 superagonist induced CRS model in humanized tumour bearing mice performed by The Jackson laboratory. A TNF antibody was included as a robust comparator as these have been found empirically to be the most potent preventors of CRS in mice despite limited utility in humans. *Statistically significant reduction of CRS scores compared to untreated controls. CRS scores had no significant difference to No CRS Control group. BID: twice daily; CRS: Cytokine Release Syndrome; TNF: Tumour necrosis factor; IL-6: Interleukin-6; IL-8: Interleukin-8
Strong Patent Portfolio & Orphan Drug Designation
- FDA Orphan Drug Designation granted in May 2025 for POLB 001 for prevention of bispecific antibody-induced CRS
- Oncology patent applications with potential for protection out to at least 2044; in vivo animal data enhances & facilitates expansion of patent applications
- Significant US patent granted in 2024 covering a class of drugs (including POLB 001) for treating hypercytokinaemia (cytokine storm) and for preventing hypercytokinaemia in a patient after an immune response has been triggered. This encompasses cytokine storm that is induced in any disease indication
- Granted patents for severe influenza which provide protection until at least 2038
Upcoming Phase 2a Trial
In advanced stage of preparation with interim data expected Summer 2026
| Chief Investigator: Dr Emma Searle, MBChB MA MRCP FRCPath PhD | Trial run by: Accelerating Clinical Trials (ACT) – specialist blood cancer trials organisation |
| Sites: The Christie NHS Foundation Trust and other leading UK specialist cancer centres | Objective: To investigate the safety and efficacy of POLB 001, in particular its ability to reduce incidence of CRS in patients receiving an approved bispecific antibody |
| No. subjects: c. 30 | Patient population: Relapsed/refractory multiple myeloma patients |
“I have seen first-hand the challenges that CRS presents to the delivery of cancer immunotherapies, requiring many of our patients to be hospitalised for treatment. These transformative therapies will continue to be restricted until there is a way to administer them more safely. POLB 001 holds great promise in tackling this issue; potentially leading to improved patient wellbeing, reducing the strain on healthcare systems while making these treatments more accessible to a broader patient population.”
Dr Emma Searle, Consultant Haematologist
Trial Design
Key Objectives/Endpoints
- Incidence of Grade 2+ CRS
- Incidence of CRS all grades
- Confirm safety and pharmacokinetics
- Tocilizumab usage
POLB 001 Media & Presentations
FDA Orphan Drug Designation Update Presentation
May 2025
POLB 001 Phase 2a Update
September 2025
References
1. Independent research by Decisive Consulting Limited. 2. Average rate from Summary of Product Characteristics (SmPCs) for Yescarta, Tecartus, Abecma, Kymriah, Carvykti, Breyanzi, Elrexfio, Columvi, Epkinly, Tecvayli and Talvey; 3. In this context, adequately is defined as both not completely preventing grade 2+ CRS and potentially sufficient to support active clinical development towards a regulatory approval of a medicine. Grade 2 CRS is defined as described by Lee et al, Biol Blood Marrow Transplant . 2019 Apr;25(4):625-638. janssenscience.com & doi.org/10.1182/blood-2022-159381; CAR T: Chimeric Antigen receptor T cell; 4. Grand View Research. CAR T-Cell Therapy Market Analysis 2023-2030. 5. Grand View Research. Bispecific Antibodies Market Size, Share & Trends Analysis Report. 6. Datamonitor Healthcare. Forecast: Diffuse Large B-Cell Lymphoma and Multiple Myeloma, 2023. 7. Datamonitor Healthcare. Forecast: Diffuse Large B-Cell Lymphoma and Multiple Myeloma, 2023. 8. Hansen DK et al., Cancers (Basel). 2023. 7;15(24):5746.