Phase 1 Open-label Study of TRX518 Monotherapy and TRX518 in Combination With Gemcitabine, Pembrolizumab, or Nivolumab

A Phase 1 Study of TRX518 Monotherapy and TRX518 in Combination With Gemcitabine, Pembrolizumab, or Nivolumab in Adults With Advanced Solid Tumors

This study will be conducted in 5 parts (Parts A, B, C, D and E).

Monotherapy Treatment:

Subjects ≥18 years with advanced solid tumors will be enrolled in the study. Monotherapy dose escalation will be performed in Part A. Cycle 1 data from each cohort will be evaluated for safety and dose-limiting toxicities (DLTs) prior to dose escalation. Subjects will be assigned to a cohort in the order screening is completed. Dose will depend upon the cohort in which a patient is enrolled and cohorts will be dosed consecutively by ascending dose. Once the maximum tolerated dose (MTD) or maximum administered dose (MAD) has been identified, an expanded cohort will be enrolled (Part B).

Combination Treatment:

Subjects ≥18 years with advanced solid tumors will be enrolled in the study. Subjects will receive TRX518 in combination with gemcitabine (Part C), pembrolizumab (Part D), or nivolumab (Part E). Dose escalation will be performed for each part (Part Cesc, Part Desc, Part Eesc) and Cycle 1 data from each cohort will be evaluated for safety and dose-limiting toxicities (DLTs) prior to dose escalation. Subjects will be assigned to a cohort in the order screening is completed. Dose will depend upon the cohort in which a patient is enrolled and cohorts will be dosed consecutively by ascending dose. Once the maximum tolerated dose (MTD) or maximum administered dose (MAD) has been identified, an expanded cohort will be enrolled (Part Cexp, Part Dexp, Part Eexp).

Study Overview

• Status: Completed
• Conditions: Solid Tumors
• Intervention / Treatment: Drug: TRX518 monotherapy; Drug: TRX518 with gemcitabine; Drug: TRX518 with pembrolizumab; Drug: TRX518 with nivolumab

• Study Type: Interventional
• Enrollment (Actual): 109
• Phase: Phase 1

Contacts and Locations

Study Locations

• United States
  • Illinois
    • Chicago, Illinois, United States, 60637
      • University of Chicago
  • New Mexico
    • Albuquerque, New Mexico, United States, 87131
      • University of New Mexico Comprehensive Cancer Center
  • Ohio
    • Cleveland, Ohio, United States, 44195
      • Cleveland Clinic
    • Cleveland, Ohio, United States, 44106
      • University Hospitals
  • Pennsylvania
    • Pittsburgh, Pennsylvania, United States, 15232
      • University of Pittsburgh Medical Center
  • Tennessee
    • Nashville, Tennessee, United States, 37205
      • Tennessee Oncology

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Advanced Solid Malignancies: Histologically documented metastatic or locally advanced, incurable solid malignancy (Parts A and B); histologically documented metastatic or locally advanced, incurable solid malignancy for which gemcitabine is clinically appropriate (e.g., non-small cell lung, breast, ovarian, pancreatic, and renal cancer); histologically documented metastatic or locally advanced, incurable solid malignancy for which pembrolizumab (Part D) or nivolumab (Part E) is approved. NOTE: Parts D and E only: Subject has either (1) received treatment with pembrolizumab or nivolumab for ≥4 months with a best response of stable disease and plans to continue treatment with either pembrolizumab or nivolumab in accordance with package insert; or (2) is not currently taking, but is eligible for treatment with, pembrolizumab or nivolumab in accordance with the approved indications for each as referenced in the package insert.
• Expected survival of at least 12 weeks after dosing.
• Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1
• Evidence of adequate organ function by standard laboratory tests.
• All female subjects of child bearing age must be either surgically sterile, postmenopausal for at least 1 year, or using an acceptable method of contraception. Adequate contraception for both male and female subjects must be used from the beginning of the screening period until at least 8 weeks after the last dose of study drug.

Exclusion Criteria:

• Hematologic malignancies or multiple myeloma.
• Known, clinically important cardiac or respiratory disease
• Any concomitant serious physical illness other than cancer (e.g., immune deficiency disease, bleeding disorder, etc.) within 1 year prior to dosing. No history of autoimmune disease.
• Active, uncontrolled infections within 7 days of study entry requiring systemic therapy.
• Evidence of progression of central nervous system (CNS) metastases or symptomatic CNS metastases within 30 days prior to dosing.
• History of known or suspected autoimmune disease with the specific exceptions of vitiligo, atopic dermatitis, or psoriasis not requiring systemic treatment. (Parts C, D and E only).
• Clinically-significant gastrointestinal disorders, such as perforation, gastrointestinal bleeding, or diverticulitis (Parts D and E only).
• Active autoimmune disease that has required systemic treatment in past 2 years (i.e. with use of disease modifying agents, corticosteroids or immunosuppressive drugs). Replacement therapy (thyroxine, insulin, or physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency, etc.) is not considered a form of systemic treatment (Parts D and E only).
• History of (non-infectious) pneumonitis that required steroids or current pneumonitis (Parts D and E only).
• History of interstitial lung disease (Parts D and E only).

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: Non-Randomized
• Interventional Model: Parallel Assignment
• Masking: None (Open Label)

Number of Arms

4

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: TRX518 monotherapy (Parts A and B); Subjects receive an assigned dose of TRX518 administered intravenously one time per week or one time per cycle on a 21-day cycle	Drug: TRX518 monotherapy; comparison of different (ascending) doses of TRX518 monotherapy
Experimental: TRX518 with gemcitabine (Part C); Subjects receive an assigned dose of TRX518 (dosed one time per cycle) intravenously administered in combination with gemcitabine (dosed two times per cycle) on a 21-day cycle	Drug: TRX518 with gemcitabine; comparison of different (ascending) doses of TRX518 in combination with gemcitabine
Experimental: TRX518 with pembrolizumab (Part D; Subjects receive an assigned dose of TRX518 (dosed one time per cycle) intravenously administered in combination with pembrolizumab (dosed one time per cycle) on a 21-day cycle	Drug: TRX518 with pembrolizumab; comparison of different (ascending) doses of TRX518 in combination with pembrolizumab
Experimental: TRX518 with nivolumab (Part E); Subjects receive an assigned dose of TRX518 (dosed two times per cycle) intravenously administered in combination with nivolumab (dosed two times per cycle) on a 28-day cycle	Drug: TRX518 with nivolumab; comparison of different (ascending) doses of TRX518 in combination with nivolumab

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Adverse events	Any adverse change in health or side effect from the initiation of the study drug dose TRX518 monotherapy and TRX518 in combination with gemcitabine, pembrolizumab or nivolumab through completion or premature withdrawal	through 30 days post last dose

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
TRX518 peak concentration (Cmax)	Observations of the distribution, duration of effects and chemical changes of TRX518 monotherapy and TRX518 in combination with gemcitabine, pembrolizumab or nivolumab in the body and the effects and routes of the body's elimination of TRX518	various timepoints through 1 week post dose
Time to peak concentration (Tmax)	Observations of the distribution, duration of effects and chemical changes of TRX518 monotherapy and TRX518 in combination with gemcitabine, pembrolizumab or nivolumab in the body and the effects and routes of the body's elimination of TRX518	various timepoints through 1 week post dose
Area under the curve (AUC)	Observations of the distribution, duration of effects and chemical changes of TRX518 monotherapy and TRX518 in combination with gemcitabine, pembrolizumab or nivolumab in the body and the effects and routes of the body's elimination of TRX518	various timepoints through 1 week post dose
RECIST assessment for evidence of antitumor activity	RECIST assessment to determine effects of TRX518 monotherapy and TRX518 in combination with gemcitabine, pembrolizumab or nivolumab on solid tumors.	up to 1 year

Collaborators and Investigators

• Sponsor: Leap Therapeutics, Inc.
• Investigators: Study Chair: Cyndi Sirard, MD, Leap Therapeutics, Inc.

Publications and helpful links

General Publications

• Zappasodi R, Sirard C, Li Y, Budhu S, Abu-Akeel M, Liu C, Yang X, Zhong H, Newman W, Qi J, Wong P, Schaer D, Koon H, Velcheti V, Hellmann MD, Postow MA, Callahan MK, Wolchok JD, Merghoub T. Rational design of anti-GITR-based combination immunotherapy. Nat Med. 2019 May;25(5):759-766. doi: 10.1038/s41591-019-0420-8. Epub 2019 Apr 29.

Study record dates

Study Major Dates

• Study Start (Actual): January 1, 2016
• Primary Completion (Actual): July 14, 2020
• Study Completion (Actual): July 14, 2020

Study Registration Dates

• First Submitted: December 1, 2015
• First Submitted That Met QC Criteria: December 9, 2015
• First Posted (Estimated): December 11, 2015

Study Record Updates

• Last Update Posted (Actual): August 3, 2025
• Last Update Submitted That Met QC Criteria: July 30, 2025
• Last Verified: July 1, 2025

More Information

Terms related to this study

• Keywords: Metastatic; solid tumors; refractory; recurrent; Stage III or IV
• Additional Relevant MeSH Terms: Antineoplastic Agents, Immunological; Immune Checkpoint Inhibitors; Antineoplastic Agents; Molecular Mechanisms of Pharmacological Action; Antimetabolites, Antineoplastic; Antimetabolites; Nivolumab; Gemcitabine; Pembrolizumab
• Other Study ID Numbers: TRX518-003

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No