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A Phase 1/2 Study of STP938 for Adult Subjects With Relapsed/Refractory B-Cell and T-Cell Lymphomas

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ClinicalTrials.gov Identifier: NCT05463263
Recruitment Status : Recruiting
First Posted : July 18, 2022
Last Update Posted : September 21, 2023
Sponsor:
Information provided by (Responsible Party):
Step Pharma, SAS

Study Description
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Brief Summary:

The Phase 1 part of the study is a dose escalation of STP938 as monotherapy.

The Phase 2 part of the study is cohort expansion of STP938 as a monotherapy in 5 different B and T cell lymphomas.


Condition or disease Intervention/treatment Phase
Lymphoma, B-Cell Lymphoma, T-Cell Drug: STP938 Phase 1 Phase 2

Detailed Description:

The drug STP938 is an inhibitor of an enzyme called cytidine triphosphate synthase 1 (CTPS1). CTPS1, and a very similar enzyme cytidine triphosphate synthase 2 (CTPS2), control the final step in the production of the cytidine triphosphate (CTP). CTP is an essential building block of deoxyribonucleic acid (DNA) and ribonucleic acid (RNA). Studies of people with inherited mutations of the CTPS1 gene indicate that certain types of blood cells required CTPS1 in order to divide rapidly, whereas other cells in the body use the CTPS2 enzyme. Based on these observations, it is expected that blocking CTPS1, using the drug STP938, may be an effective treatment for certain types of cancer that arise from blood cells.

The purpose of this study is to see if STP938 is effective at treating different types of lymphoma. STP938 will be given as a tablet. Blood samples will be taken during the study in order to understand the effects of STP938 on the lymphoma and on the rest of the body. The main outcome of the first part of the study is to see if STP938 can be given safely to patients with lymphoma, and to work out the best dose of STP938. The main outcome of the second part of the study is to see if ST938 is effective in treating different types of lymphoma.

Study Design
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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 180 participants
Allocation: Non-Randomized
Intervention Model: Sequential Assignment
Intervention Model Description: Patients will be assigned to a dose level of STP938 (Phase 1) or an expansion cohort (Phase 2) at the time of their enrollment.
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: An Open-Label, First in Human, Phase 1/2 to Evaluate Safety, Tolerability, Pharmacokinetics, and Preliminary Efficacy of the CTPS1 Inhibitor STP938 In Adult Subjects With Relapsed/Refractory B-Cell and T-Cell Lymphomas
Actual Study Start Date : August 3, 2022
Estimated Primary Completion Date : December 2025
Estimated Study Completion Date : December 2025

Resource links provided by the National Library of Medicine

MedlinePlus related topics: Lymphoma

Arms and Interventions
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Arm Intervention/treatment
Experimental: Phase 1 (Part 1, Dose Escalation)
Up to 5 dose levels with STP938 administered as oral monotherapy
 Drug: STP938
Small molecule
Experimental: Phase 2 (Part 2; expansion)
At defined dose level(s) with STP938 administered as oral monotherapy
 Drug: STP938
Small molecule


Outcome Measures
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Primary Outcome Measures :
  1. Safety and Tolerability (Phase 1 / Dose Escalation) [ Time Frame: Through study completion, an average of 9 months ]
    Incidence of dose limiting toxicities (DLTs), serious adverse events (SAEs), treatment-emergent adverse events (TEAEs)

  2. Objective Response Rate (ORR) (Phase 2 / Dose Expansion) [ Time Frame: Through study completion, an average of 9 months ]
    ORR is defined as the proportion of subjects achieving a confirmed response (complete response [CR] or partial response [PR]). Evaluation of ORR will be via standard response criteria


Secondary Outcome Measures :
  1. Maximum plasma concentration (Cmax) of STP938 including effects of food on absorption (Phase 1 / Dose Escalation) [ Time Frame: 16 Days ]
    Pharmacokinetic parameter from plasma STP938 levels

  2. Time to reach maximum concentration (TMax) of STP938 including effects of food on absorption (Phase 1 / Dose Escalation) [ Time Frame: 16 Days ]
    Pharmacokinetic parameter from plasma STP938 levels

  3. Area under the curve (AUC) of STP938 including effects of food on absorption (Phase 1 / Dose Escalation) [ Time Frame: 16 Days ]
    Pharmacokinetic parameter from plasma STP938 levels

  4. Evaluate preliminary clinical activity of STP938 (Phase 1) [ Time Frame: Through study completion, an average of 9 months ]
    Evaluation of ORR using standard response criteria

  5. Evaluate best overall response of STP938 (Phase 1 / Phase 2) [ Time Frame: Through study completion, an average of 9 months ]
    Evaluation of best overall response (Complete response [CR], Partial response [PR], Stable disease [SD], Progression of disease [PD], Not evaluable, Not applicable) using standard response criteria

  6. Evaluation Time To Respond (Phase 1 / Phase 2) [ Time Frame: Through study completion, an average of 9 months ]
    Time to response (TTR) defined as the time from first dose of STP938 to the date of first CR or PR response assessment

  7. Evaluation Duration of Response (Phase 1 / Phase 2) [ Time Frame: Through study completion, an average of 9 months ]
    Duration of response (DoR) is defined as the time, in days, from the date measurement criteria that are first met for CR or PR (whichever is first recorded) to the first date that relapse, progressive disease or death, whichever occurs first

  8. Evaluation Progression Free Survival (Phase 1 / Phase 2) [ Time Frame: Through study completion, an average of 9 months ]
    Progression-free survival (PFS) is defined as the time from first STP938 dose to the date of disease progression or death, whichever occurs first

  9. Evaluation of Complete Response Rate (Phase 2) [ Time Frame: Through study completion, an average of 9 months ]
    Complete Response Rate using standard response criteria

  10. Safety and Tolerability (Phase 2 / Dose Expansion) [ Time Frame: Through study completion, an average of 9 months ]
    Incidence of SAEs and TEAEs


Eligibility Criteria
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Ages Eligible for Study:   18 Years and older   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Criteria

Main Inclusion Criteria:

  • Signed and dated informed consent, and able to comply with the study procedures and any locally required authorization.
  • Male or female aged ≥ 18 years.
  • Relapsed/refractory patients with histologically confirmed diagnosis of B cell or T cell lymphoma
  • Must have received at least 2 prior systemic therapies and have no treatment options known to provide clinical benefit
  • Must have measurable disease per Lugano lymphoma classification except for cutaneous T-cell lymphoma (CTCL) which is measured via International Society for Cutaneous Lymphomas (ISCL)/ European Organization of Research and Treatment of Cancer (EORTC).
  • Eastern Cooperative Oncology Group (ECOG) performance status ≤2.
  • Life expectancy > 3 months as assessed by the Investigator.
  • Adequate organ function (bone marrow, hepatic, renal function and coagulation).
  • All toxicities (except alopecia) from prior cancer treatments or procedures must have resolved to ≤Grade 1 or returned to baseline levels prior to enrollment.

Main Exclusion Criteria:

  • Pregnant or breastfeeding females and women of child bearing potential or males unwilling to comply with contraception requirements.
  • Known carcinomatous meningitis or central nervous system (CNS) involvement with lymphoma.
  • Active malignancy within 2 years of study enrollment
  • Prior radiation or surgical resection of their lymphoma without additional sites of measurable disease outside of the radiation field or subjects who have received prior radiation or surgical resection of their lymphoma ≤2 weeks prior to the first dose of study drug.
  • Systemic cancer treatments, monoclonal antibody-directed therapies, other investigational agents within 4 weeks before enrollment, or <5 half-lives since completion of previous investigational therapy, whichever is shorter.
  • Uncontrolled intercurrent illness.
  • Immunocompromised subjects with increased risk of opportunistic infections or history of opportunistic infection in the last 12 months.
  • Known active or chronic hepatitis B or active hepatitis C virus (HCV) infection.
  • Subjects who have received a live vaccine within 30 days prior to study enrollment or whilst participating in the study.
  • Subjects with corrected QT interval >470 msec based on averaged triplicate electrocardiogram (ECG) readings at the Screening Visit using the QT interval corrected for heart rate using Fridericia's method (QTcF).
  • Subjects who received a severe acute respiratory syndrome coronavirus 2 vaccine ≤3 weeks prior to study drug dosing.
Contacts and Locations
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Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT05463263


Contacts
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Contact: Maureen Higgins +33 1 86 26 43 56 STP938-101@step-ph.com
Contact: Duc Tran +33 1 86 26 43 56 STP938-101@step-ph.com

Locations
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United States, Colorado
Colorado Blood Cancer Institute Recruiting
Denver, Colorado, United States, 80218
Contact: M Tees         
United States, Florida
Florida Cancer Specialists Recruiting
Sarasota, Florida, United States, 34232
Contact: M Patel         
France
The Centre Léon Bérard Recruiting
Lyon, France
Contact: Yann Guillerman         
Institut Paoli Calmettes Recruiting
Marseille, France
Contact: Robin Noel         
Contact: Jean Laurent L'Attention    : +33 (0)4 9122 37 29      
CHU de Nantes Recruiting
Nantes, France
Contact: Benoit Tessoulin         
Institut Gustave Roussy Recruiting
Villejuif, France
Contact: Vincent Ribrag         
United Kingdom
University Hospitals of Leicester NHS Trust Recruiting
Leicester, United Kingdom
Contact: Matthew Ahearne         
Imperial College / Clinical Trials Unit, Hammersmith Hospital Recruiting
London, United Kingdom
Contact: Lucy Cook    0203 313 4340      
The Christie Recruiting
Manchester, United Kingdom
Contact: Kim Linton         
Nottingham City Hospital Recruiting
Nottingham, United Kingdom
Contact: Chris Fox         
Churchill Hospital Recruiting
Oxford, United Kingdom
Contact: Graham Collins         
Derriford Hospital Recruiting
Plymouth, United Kingdom
Contact: David Lewis         
The Royal Marsden Recruiting
Sutton, United Kingdom
Contact: Dima El Sharkawi       HaemOncGT@rmh.nhs.uk   
Sponsors and Collaborators
Step Pharma, SAS
Investigators
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Study Director: Maureen Higgins Step Pharma
More Information
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Responsible Party: Step Pharma, SAS
ClinicalTrials.gov Identifier: NCT05463263    
Other Study ID Numbers: STP938-101
First Posted: July 18, 2022    Key Record Dates
Last Update Posted: September 21, 2023
Last Verified: September 2023
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Additional relevant MeSH terms:
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Lymphoma
Lymphoma, T-Cell
Lymphoma, B-Cell
Neoplasms by Histologic Type
Neoplasms
 Lymphoproliferative Disorders
Lymphatic Diseases
Immunoproliferative Disorders
Immune System Diseases
Lymphoma, Non-Hodgkin