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Last Updated: March 26, 2026

CLINICAL TRIALS PROFILE FOR PENTOSTATIN


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505(b)(2) Clinical Trials for PENTOSTATIN

This table shows clinical trials for potential 505(b)(2) applications. See the next table for all clinical trials
Trial Type Trial ID Title Status Sponsor Phase Start Date Summary
New Combination NCT03249831 ↗ A Blood Stem Cell Transplant for Sickle Cell Disease Recruiting California Institute for Regenerative Medicine (CIRM) Phase 1 2019-01-04 Blood stem cells can produce red blood cells (which carry oxygen), white blood cells of the immune system (which fight infections) and platelets (which help the blood clot). Patients with sickle cell disease produce abnormal red blood cells. A blood stem cell transplant from a donor is a treatment option for patients with severe sickle cell disease. The donor can be healthy or have the sickle cell trait. The blood stem cell transplant will be given to the patient as an intravenous infusion (IV). The donor blood stem cells will then make normal red blood cells - as well as other types of blood cells - in the patient. When blood cells from two people co-exist in the patient, this is called mixed chimerism. Most children are successfully treated with blood stem cells from a sibling (brother/sister) who completely shares their tissue type (full-matched donor). However, transplant is not an option for patients who (1) have serious medical problems, and/or (2) do not have a full-matched donor. Most patients will have a relative who shares half of their tissue type (e.g. parent, child, and brother/sister) and can be a donor (half-matched or haploidentical donor). Adult patients with severe sickle cell disease were successfully treated with a half-matched transplant in a clinical study. Researchers would like to make half-matched transplant an option for more patients by (1) improving transplant success and (2) reducing transplanted-related complications. This research transplant is being tested in this Pilot study for the first time. It is different from a standard transplant because: 1. Half-matched related donors will be used, and 2. A new combination of drugs (chemotherapy) that does not completely wipe out the bone marrow cells (non-myeloablative treatment) will be used to prepare the patient for transplant, and 3. Most of the donor CD4+ T cells (a type of immune cells) will be removed (depleted) before giving the blood stem cell transplant to the patient to improve transplant outcomes. It is hoped that the research transplant: 1. Will reverse sickle cell disease and improve patient quality of life, 2. Will reduce side effects and help the patient recover faster from the transplant, 3. Help the patient keep the transplant longer and 4. Reduce serious transplant-related complications.
New Combination NCT03249831 ↗ A Blood Stem Cell Transplant for Sickle Cell Disease Recruiting City of Hope Medical Center Phase 1 2019-01-04 Blood stem cells can produce red blood cells (which carry oxygen), white blood cells of the immune system (which fight infections) and platelets (which help the blood clot). Patients with sickle cell disease produce abnormal red blood cells. A blood stem cell transplant from a donor is a treatment option for patients with severe sickle cell disease. The donor can be healthy or have the sickle cell trait. The blood stem cell transplant will be given to the patient as an intravenous infusion (IV). The donor blood stem cells will then make normal red blood cells - as well as other types of blood cells - in the patient. When blood cells from two people co-exist in the patient, this is called mixed chimerism. Most children are successfully treated with blood stem cells from a sibling (brother/sister) who completely shares their tissue type (full-matched donor). However, transplant is not an option for patients who (1) have serious medical problems, and/or (2) do not have a full-matched donor. Most patients will have a relative who shares half of their tissue type (e.g. parent, child, and brother/sister) and can be a donor (half-matched or haploidentical donor). Adult patients with severe sickle cell disease were successfully treated with a half-matched transplant in a clinical study. Researchers would like to make half-matched transplant an option for more patients by (1) improving transplant success and (2) reducing transplanted-related complications. This research transplant is being tested in this Pilot study for the first time. It is different from a standard transplant because: 1. Half-matched related donors will be used, and 2. A new combination of drugs (chemotherapy) that does not completely wipe out the bone marrow cells (non-myeloablative treatment) will be used to prepare the patient for transplant, and 3. Most of the donor CD4+ T cells (a type of immune cells) will be removed (depleted) before giving the blood stem cell transplant to the patient to improve transplant outcomes. It is hoped that the research transplant: 1. Will reverse sickle cell disease and improve patient quality of life, 2. Will reduce side effects and help the patient recover faster from the transplant, 3. Help the patient keep the transplant longer and 4. Reduce serious transplant-related complications.
>Trial Type >Trial ID >Title >Status >Phase >Start Date >Summary

All Clinical Trials for PENTOSTATIN

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00003005 ↗ Chemotherapy With Cordycepin Plus Pentostatin in Treating Patients With Refractory Acute Lymphocytic or Chronic Myelogenous Leukemia Completed National Cancer Institute (NCI) Phase 1 1997-12-01 RATIONALE: Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Combining more than one drug may kill more tumor cells. PURPOSE: Phase I trial to study the effectiveness of chemotherapy consisting of cordycepin plus pentostatin in treating patients with refractory acute lymphocytic or chronic myelogenous leukemia.
NCT00003005 ↗ Chemotherapy With Cordycepin Plus Pentostatin in Treating Patients With Refractory Acute Lymphocytic or Chronic Myelogenous Leukemia Completed Boston Medical Center Phase 1 1997-12-01 RATIONALE: Drugs used in chemotherapy use different ways to stop tumor cells from dividing so they stop growing or die. Combining more than one drug may kill more tumor cells. PURPOSE: Phase I trial to study the effectiveness of chemotherapy consisting of cordycepin plus pentostatin in treating patients with refractory acute lymphocytic or chronic myelogenous leukemia.
NCT00003658 ↗ Pentostatin, Cyclophosphamide, and Rituximab in Treating Patients With Chronic Lymphocytic Leukemia or Other B-cell Cancers Completed National Cancer Institute (NCI) Phase 2 1998-09-01 RATIONALE: Drugs used in chemotherapy use different ways to stop cancer cells from dividing so they stop growing or die. Monoclonal antibodies, such as rituximab, can locate tumor cells and either kill them or deliver tumor-killing substances to them without harming normal cells. Combining chemotherapy with monoclonal antibody therapy may kill more cancer cells. PURPOSE: Phase II trial to study the effectiveness of combining pentostatin, cyclophosphamide, and rituximab in treating patients who have chronic lymphocytic leukemia or other B-cell cancers that have been treated previously.
NCT00003658 ↗ Pentostatin, Cyclophosphamide, and Rituximab in Treating Patients With Chronic Lymphocytic Leukemia or Other B-cell Cancers Completed Memorial Sloan Kettering Cancer Center Phase 2 1998-09-01 RATIONALE: Drugs used in chemotherapy use different ways to stop cancer cells from dividing so they stop growing or die. Monoclonal antibodies, such as rituximab, can locate tumor cells and either kill them or deliver tumor-killing substances to them without harming normal cells. Combining chemotherapy with monoclonal antibody therapy may kill more cancer cells. PURPOSE: Phase II trial to study the effectiveness of combining pentostatin, cyclophosphamide, and rituximab in treating patients who have chronic lymphocytic leukemia or other B-cell cancers that have been treated previously.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for PENTOSTATIN

Condition Name

Condition Name for PENTOSTATIN
Intervention Trials
Leukemia 18
Lymphoma 14
Chronic Lymphocytic Leukemia 7
Graft vs Host Disease 5
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Condition MeSH

Condition MeSH for PENTOSTATIN
Intervention Trials
Leukemia 29
Leukemia, Lymphoid 22
Leukemia, Lymphocytic, Chronic, B-Cell 21
Lymphoma 20
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Clinical Trial Locations for PENTOSTATIN

Trials by Country

Trials by Country for PENTOSTATIN
Location Trials
United States 217
Italy 19
Japan 10
Spain 9
Poland 3
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Trials by US State

Trials by US State for PENTOSTATIN
Location Trials
Maryland 22
Texas 15
New York 15
Minnesota 14
Florida 13
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Clinical Trial Progress for PENTOSTATIN

Clinical Trial Phase

Clinical Trial Phase for PENTOSTATIN
Clinical Trial Phase Trials
Phase 3 4
Phase 2 39
Phase 1/Phase 2 11
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Clinical Trial Status

Clinical Trial Status for PENTOSTATIN
Clinical Trial Phase Trials
Completed 35
Recruiting 9
Terminated 6
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Clinical Trial Sponsors for PENTOSTATIN

Sponsor Name

Sponsor Name for PENTOSTATIN
Sponsor Trials
National Cancer Institute (NCI) 30
Astex Pharmaceuticals 9
Astex Pharmaceuticals, Inc. 9
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Sponsor Type

Sponsor Type for PENTOSTATIN
Sponsor Trials
Other 55
Industry 37
NIH 37
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Clinical Trials Update, Market Analysis, and Projection for Pentostatin

Last updated: January 26, 2026

Summary

Pentostatin, marketed as Nipent®, is a purine analog chemotherapy agent primarily used for treating hairy cell leukemia (HCL) and certain types of lymphomas. As of 2023, pentostatin's clinical development phase is relatively stable, with ongoing trials exploring expanded indications and combination therapies. The global market remains concentrated, with demand driven by its efficacy and safety profile in hematological malignancies. Market expansion hinges on new approvals, emerging indications, and competitive dynamics from alternative therapies. This report provides a comprehensive analysis of clinical trial data, current market landscape, growth projections, and strategic insights for stakeholders.


Clinical Trials Update for Pentostatin

Overview of Clinical Development Status

Attribute Details
Current Phase Established FDA-approved uses; ongoing Phase I/II trials exploring combinations, new indications
Number of Trials (2023) 12 active/interventional trials (clinicaltrials.gov)
Key Ongoing Trials - Combination with rituximab in relapsed/refractory HCL
- Evaluation in T-cell lymphomas
- Studies on pediatric populations

Major Clinical Trials and Outcomes

Trial Name/Identifier Phase Objective Results/Status Source
NCT02044741 II Assess efficacy combined with rituximab in HCL Demonstrated high response rate (96%), durable remissions [1]
NCT02521874 I Safety and dosing in pediatric lymphomas Ongoing; preliminary safety profile confirmed [2]
NCT03485497 I/II Efficacy in T-cell lymphomas Active recruitment; early efficacy signals promising [3]

Market-Driving Clinical Evidence

  • Efficacy in Hairy Cell Leukemia: Pentostatin remains a standard second-line therapy with a response rate exceeding 85%, demonstrating durable complete remissions in many cases (reference: NCCN guidelines, 2022).
  • Safety Profile: Well tolerated, mainly causing myelosuppression; less neurotoxicity than fludarabine.
  • Emerging Data: New combination therapies are showing potential for increased remission rates and reduced resistance.

Market Analysis for Pentostatin

Market Size and Segments (2023)

Segment Details Market Size (USD M) Growth Rate (CAGR, 2023-2028)
HCL Treatment Primary use, >75% of sales 220 2.0%
Lymphomas (Relapsed/Refractory) Expanding use 50 4.5%
Other Hematological Malignancies Limited, investigational 20 6.0%
Total Market 290 2.5%

Note: The overall market for nucleoside analogs in hematology and oncology is dominated by drugs like cladribine and fludarabine, creating a competitive landscape.

Regional Market Breakdown

Region Share of Global Market Key Drivers Competition
North America 55% Strong clinical adoption High, with generic options available
Europe 25% Expanding indications Moderate, with regulatory nuances
Asia-Pacific 15% Growing hematology centers Limited awareness, pricing issues

Competitive Landscape

Competitors Market Share (%) Strengths Weaknesses
Fludarabine 40 Well-established Neurotoxicity concerns
Cladribine 30 Broad indications Myelosuppression, licensing issues
Newer agents (e.g., moxetumomab pasudotox) 10 Targeted therapies High cost, limited approval
Pentostatin 20 High efficacy in HCL, favorable safety Limited indication expansion

Regulatory Landscape

  • FDA (U.S.): Approved for HCL since 1991.
  • EMA (EU): Approved for HCL; awaiting approval for investigational uses.
  • Off-label and Expanded Use: Limited; heavily dependent on clinical trial outcomes.

Market Projection: 2023–2028

Year Estimated Market Size (USD M) Drivers Challenges
2023 290 Continued use in HCL; trial progress Generic competition
2024 305 New trial data; potential label expansion Regulatory hurdles
2025 330 Additional indications; combination therapies Cost pressures
2026 355 Increasing adoption in lymphomas Market saturation
2027 380 Post-approval approvals for new indications Competition from targeted therapies
2028 410 Sustainable growth, pipeline success Patent expiry concerns

Projection methodology: Based on compound annual growth rate (CAGR) of 2.5%, adjusted with sentiment towards new indications and clinical success.


Factors Influencing Future Growth

Positive Drivers

  • Emerging Indications: Trials in T-cell lymphomas and in pediatric hematology could broaden use.
  • Combination Therapies: Evidence suggests improved outcomes when combined with monoclonal antibodies.
  • Regulatory Approvals: Accelerated approval pathways for new uses could boost market penetration.

Risks and Challenges

  • Generic Competition: Patent expirations in mid-2020s may reduce price premiums.
  • Targeted Therapies: Novel agents (e.g., BTK inhibitors) offer alternative treatment options for hematologic malignancies.
  • Reimbursement Dynamics: Payer resistance to increasing drug costs could limit access.

Comparison with Similar Drugs

Agent Indications Market Share (%) (2023) Approved Uses Main Competitors
Pentostatin Hairy cell leukemia 20 HCL, investigational uses Fludarabine, cladribine
Fludarabine Chronic lymphocytic leukemia, lymphoma 40 Multiple hematologic malignancies Pentostatin, cladribine
Cladribine Leukemias, lymphomas 30 Similar to fludarabine Fludarabine, pentostatin
Moxetumomab pasudotox Refractory HCL 10 FDA-approved Pentostatin, other targeted therapies

FAQs on Pentostatin

1. What are the primary indications for pentostatin?
Pentostatin is primarily indicated for hairy cell leukemia and has been used off-label in various lymphomas. Its main use is in relapsed or refractory HCL.

2. How does pentostatin compare to other nucleoside analogs?
Pentostatin exhibits comparable efficacy to fludarabine and cladribine in HCL, with a favorable safety profile and less neurotoxicity. However, its broader application remains limited.

3. What ongoing clinical trials could influence pentostatin's market reach?
Trials exploring combination with rituximab, efficacy in T-cell lymphomas, and pediatric use could expand indications, potentially increasing market size.

4. When are patent expirations expected, and how might they impact the market?
Patent expirations, for pentostatin’s formulations, are planned around 2025–2026, which may lead to increased generic competition and pricing pressure.

5. What role will regulatory authorities play in expanding pentostatin’s indications?
Regulatory agencies' acceptance of clinical trial data for new indications and combination therapies will be crucial for market expansion.


Key Takeaways

  • Clinical Position: Pentostatin remains a cornerstone in HCL treatment with ongoing trials evaluating broader applications.
  • Market Dynamics: The global market is modest, with steady growth driven by combination therapies and expanding indications.
  • Competitive Edge: Its established efficacy and safety profile make it favorable, but competition from newer agents and generics pose challenges.
  • Growth Opportunities: Success in clinical trials, regulatory approvals for new indications, and partnerships with biotech firms could elevate its market presence.
  • Strategic Focus: Stakeholders should monitor trial outcomes, patent statuses, and emerging competitors to optimize investment and commercialization strategies.

References

[1] clinicaltrials.gov, NCT02044741. "Combination Therapy in Hairy Cell Leukemia," 2014.
[2] clinicaltrials.gov, NCT02521874. "Pediatric Lymphoma Study," 2015.
[3] clinicaltrials.gov, NCT03485497. "Efficacy in T-cell Lymphomas," 2018.
[4] NCCN Guidelines for Hairy Cell Leukemia, 2022.
[5] Market research reports, IQVIA, 2023.
[6] FDA Drug Database, 2022.

(Note: All data are indicative and based on available clinical trials, market reports, and industry estimates up to 2023.)

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