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Study of TST005 in Patients With Locally Advanced or Metastatic Solid Tumors

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT04958434
Recruitment Status : Recruiting
First Posted : July 12, 2021
Last Update Posted : November 3, 2021
Information provided by (Responsible Party):
Transcenta Therapeutics

Brief Summary:
This is an open label Phase 1, first-in-human (FIH) study of TST005, a bi-specific antibody consisting of a PD-L1 monoclonal antibody (mAb) and a transforming growth factor beta (TGF-β) trap in subjects with locally advanced or metastatic cancers

Condition or disease Intervention/treatment Phase
Locally Advanced or Metastatic Cancers Metastatic Human Papillomavirus-Related Malignant Neoplasm Drug: TST005 Phase 1

Detailed Description:

The study has 2 parts. Part A is a dose escalation portion where the patients will be doses every three weeks following an accelerated 3+3 design. This portion will enroll approximately 25 patients with locally advanced or metastatic cancers.

Part B is an expansion portion where approximately 30 additional patients will be dosed at the recommended dose level every 3 weeks. This part will include patients with locally advanced or metastatic HPV related malignancies.

The trial will last approximately 2 years, with assessments including safety labs, ECGs, PKs and PDs and CT/MRI tumor assessments, based on the Q3W dosing schedule.

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 55 participants
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Intervention Model Description: Part A - Q3w 3+3 design dose escalation Part B - Dose expansion of approximately 30 patients
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: A Phase 1, First in Human, Open-label, Dose Escalation and Dose Expansion Study of TST005 in Patients With Locally Advanced or Metastatic Solid Tumors
Actual Study Start Date : June 11, 2021
Estimated Primary Completion Date : July 31, 2023
Estimated Study Completion Date : December 31, 2023

Arm Intervention/treatment
Experimental: Part A - Dose Escalation
Dosed every 3 weeks IV with TST005, starting dose is 1 mg/kg, and 5 dose levels will be tested.
Drug: TST005
TST005 is a bifunctional human immunoglobulin G1 (IgG1) monoclonal

Experimental: Part B - Dose Expansion
Participants with any kind of advanced or HPV metastatic solid tumors dosed Q3W with the Part A Q3W recommended dose of TST005
Drug: TST005
TST005 is a bifunctional human immunoglobulin G1 (IgG1) monoclonal

Primary Outcome Measures :
  1. Part A - Determine the maximum tolerated dose (MTD) or recommended Phase 2 dose(s) (RP2D) [ Time Frame: Up to 90 days following last dose ]
    As measured by the number of participants experiencing a dose limiting toxicity (DLT) in each dosing cohort

  2. Part B - Patient safety as characterized by frequency and severity of adverse events [ Time Frame: Up to 90 days following last dose ]
    Characterize the safety profile of TST005 including the frequency and severity of treatment-emergent adverse events.

Secondary Outcome Measures :
  1. Part A - Area under Plasma concentration vs. time curve (AUC) for TST005 [ Time Frame: Up to 90 days following last dose ]
    Observe changes in AUC over time

  2. Part A - Peak Plasma concentration (Cmax) for TST005 [ Time Frame: Up to 90 days following last dose ]
    Observe the maximum serum concentration

  3. Part A - Time to maximum observed serum (Tmax) for TST005 [ Time Frame: Up to 90 days following last dose ]
    Tmax is the time in hours / days for TST005 to reach the maximum concentration after administration

  4. Part A - Terminal half-life of TST005 [ Time Frame: Up to 90 days following last dose ]
    Time for serum level to decrease by 1/2 during the terminal elimination phase

  5. Immunogenicity of TST005 [ Time Frame: Up to 90 days following last dose ]
    To determine if the formation of Anti-drug antibodies (ADA) or neutralizing antibodies (NAb) against TST005 are observed

  6. Part B - Assess the Objective response rate (ORR) of TST005 [ Time Frame: Up to 90 days following last dose ]
    as measured by RECIST v 1.1 and iRECIST

  7. Part B - Assess the Disease Control rate (DCR) of TST005 [ Time Frame: Up to 90 days following last dose ]
    Percentage of patients that exhibit stable disease (SD), + partial response (PR), + complete response (CR)

  8. Part B - Assess the Duration of Response of TST005 [ Time Frame: Up to 90 days following last dose ]
    Measured by the time a patient shows response

  9. Part B - Assess the Time to Response (TTR) of TST005 [ Time Frame: Up to 90 days following last dose ]
    Measured by the average time patients show a response to TST005

  10. Part B - Assess the Progression -free Survival (PFS) of TST005 [ Time Frame: Up to 90 days following last dose ]
    Measured by the average time before patients show signs of disease progression after receiving TST005

  11. Part B - Assess the Overall Survival (OS) of TST005 [ Time Frame: Up to 90 days following last dose ]
    Time between treatment of TST005 and death for any reason

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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

Inclusion Criteria:

  1. Willing and able to provide signed and dated informed consent
  2. Patients with histologically or cytologically confirmed, locally advanced or metastatic solid tumors, evaluable by RECIST v1.1. (Part B includes metastatic HPV+ malignancies)
  3. Subject who has tumor progression during or after prior therapy and for whom no standard therapy exists that would confer clinical benefit.
  4. At least one measurable lesion per RECIST 1.1 (Part B only).
  5. Eastern Cooperative Oncology Group Performance Status (ECOG PS)0~1.
  6. Provide archived tumor tissue samples
  7. Adequate organ function

Exclusion Criteria:

  1. Concurrent malignancy within 3 years prior to entry other than adequately treated cervical carcinoma-in-situ, localized squamous cell cancer of the skin, basal cell carcinoma, prostate cancer not requiring treatment (with or without resection), ductal carcinoma in situ of the breast, or ≤ T1 urothelial carcinoma.
  2. Untreated or symptomatic central nervous system (CNS) metastases.
  3. Any unresolved Grade 2 or greater toxicity from previous anticancer therapy except alopecia.
  4. Active leptomeningeal disease.
  5. Active autoimmune diseases or history of autoimmune diseases that may relapse, with the following exceptions:

    • Controlled type 1 diabetes
    • Hypothyroidism (provided it is managed with hormone-replacement therapy only)
    • Controlled celiac disease
    • Skin diseases not requiring systemic treatment (eg, vitiligo, psoriasis, or alopecia)
    • Any other disease that is not expected to recur in the absence of external triggering factors
  6. Any condition that required systemic treatment with either corticosteroids (> 10 mg daily of prednisone or equivalent) or other immunosuppressive medication ≤ 14 days before the first dose of investigational product, with the following exceptions:

    • Adrenal replacement steroid (dose ≤ 10 mg daily of prednisone or equivalent)
    • Topical, ocular, intra-articular, intranasal, or inhalational corticosteroid with minimal systemic absorption
    • Short course (≤ 7 days) of corticosteroid prescribed prophylactically (eg, for contrast dye allergy) or for the treatment of a non-autoimmune condition (eg, delayed-type hypersensitivity reaction caused by contact allergen)
  7. History of interstitial lung disease, noninfectious pneumonitis, or uncontrolled lung diseases, including but not limited to pulmonary fibrosis, active pneumonitis.
  8. Severe cardiovascular disease, including cerebrovascular accident, transient ischemic attack, myocardial infarction, or unstable angina, New York Heart Association class III or IV heart failure or uncontrolled arrhythmia within 6 months of first dose.
  9. Active, uncontrolled bacterial, viral, or fungal infections, requiring systemic therapy within 2 weeks of screening.
  10. Clinically significant bleeding within three months of the first dose.
  11. Uncontrolled hypertension, defined as systolic ≥150 mm Hg or diastolic ≥90 mm Hg maintained over time and despite antihypertensive treatment.
  12. Patients with QTcF > 480 ms on screening ECG or with a history of additional risk factors for TdP (e.g., heart failure, hypokalemia,family history of Long QT Syndrome)
  13. Pregnant or nursing.
  14. Known human immunodeficiency virus (HIV) or known acquired immunodeficiency syndrome.
  15. A serious nonmalignant disease (e.g., psychiatric, substance abuse, uncontrolled intercurrent illness, etc.) that could compromise protocol objectives in the opinion of the Investigator and/or the Sponsor.
  16. Any other condition that, in the opinion of the Investigator, would prohibit the subject from participating in the study.
  17. Active autoimmune disease requiring systemic therapy in the last 2 years prior to the first dose (i.e., with use of disease modifying agents, systemic corticosteroids or immunosuppressive drug).

    • Subjects with Type 1 diabetes mellitus (TD1M), hypothyroidism requiring only hormone replacement, or skin disorders not requiring systemic treatment are permitted to enroll.

  18. A history of (non-infectious) pneumonitis that required steroids or has current pneumonitis.
  19. < 4 weeks after any major procedures/surgery; clinically significant unhealed wound; any unhealed ulceration in GI prior to first dose of TST005.
  20. History of severe immune-related adverse effects from checkpoint inhibitor (CPI) therapy (NCI CTCAE Grade 3 or 4) with the exception of endocrinopathy managed with replacement therapy or subjects who discontinued CPI therapy for CPI-associated toxicity or intolerability.

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 identifier (NCT number): NCT04958434

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Contact: Tina Rahbarnia 949 233 2209
Contact: Meriam Djemai Zoghlache +33 761 539 165

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United States, Ohio
Gabrail Cancer Center Recruiting
Canton, Ohio, United States, 44718
Contact: Carrie Smith    330-492-3345   
Contact: Brittany Dessecker    330-492-3345   
United States, Texas
Mary Crowley Cancer Research Recruiting
Dallas, Texas, United States, 75230
Contact: Joshua Matson    214-545-3933   
Principal Investigator: Minal Barve, MD         
NEXT Oncology Recruiting
San Antonio, Texas, United States, 78229
Contact: Anthony W Tolcher, MD    210-580-9500   
Sponsors and Collaborators
Transcenta Therapeutics
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Study Director: Charlie Qi, MD Transcenta Therapeutics
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Responsible Party: Transcenta Therapeutics Identifier: NCT04958434    
Other Study ID Numbers: TST005-1001
First Posted: July 12, 2021    Key Record Dates
Last Update Posted: November 3, 2021
Last Verified: November 2021
Individual Participant Data (IPD) Sharing Statement:
Plan to Share IPD: No
Plan Description: individual participant data (IPD) will not be shared to other researchers

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Studies a U.S. FDA-regulated Drug Product: Yes
Studies a U.S. FDA-regulated Device Product: No
Keywords provided by Transcenta Therapeutics:
Additional relevant MeSH terms:
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