Study of JTX-8064, as Monotherapy and in Combination With a PD-1 Inhibitor, in Adult Subjects With Advanced Refractory Solid Tumors

Phase 1/2 First-in-Human (FIH) Study of Leukocyte Immunoglobulin-Like Receptor B2 (LILRB2) Inhibitor Monoclonal Antibody (mAb) JTX-8064, as Monotherapy and in Combination With a Programmed Cell Death Receptor-1 (PD-1) Inhibitor, in Adult Subjects With Advanced Refractory Solid Tumor Malignancies

JTX-8064-101 is a Phase 1/2, open label, dose escalation and dose expansion clinical study to determine the safety, tolerability, and recommended Phase 2 dose (RP2D) of JTX-8064 alone and in combination with a PD-1 inhibitor (PD-1i).

Study Overview

• Status: Completed
• Conditions: Cancer
• Intervention / Treatment: Drug: JTX-8064; Drug: pimivalimab

Detailed Description

JTX-8064 is a humanized mAb designed to block the interaction of LILRB2 with its known ligands, endogenous major histocompatibility complex class I (MHC I) molecules. This is a Phase 1/2, first in human, open label, multicenter, dose escalation and dose expansion clinical trial to determine the safety, tolerability, maximum tolerated dose (MTD) and RP2D of JTX-8064 when administered as a single agent and in combination with a PD-1i in adult subjects with advanced refractory solid tumor malignancies. Additionally, the study will seek to evaluate the pharmacokinetics and immunogenicity of JTX-8064, and preliminary efficacy of JTX-8064 as a monotherapy and in combination with a PD-1i.

• Study Type: Interventional
• Enrollment (Actual): 190
• Phase: Phase 2; Phase 1

Contacts and Locations

• Study Contact: Name: Nancy Mota; Phone Number: (857) 259-3840; Email: nmota@jouncetx.com
• Study Contact Backup: Name: Keith Barnett; Phone Number: (857) 999-2968; Email: kbarnett@jouncetx.com

Study Locations

• United States
  • Alabama
    • Birmingham, Alabama, United States, 35249
      • University of Alabama at Birmingham
  • Arizona
    • Gilbert, Arizona, United States, 85234
      • Banner MD Anderson Cancer Center
    • Tucson, Arizona, United States, 85258
      • Arizona Clinical Research Center
  • Arkansas
    • Little Rock, Arkansas, United States, 72205
      • University of Arkansas Medical Sciences
  • California
    • Duarte, California, United States, 91010
      • City of Hope
    • La Jolla, California, United States, 92093
      • University of California, San Diego
    • La Jolla, California, United States, 92037
      • California Cancer Associates for Research & Excellence, Inc.
    • Los Angeles, California, United States, 90048
      • Cedars Sinai
    • Orange, California, United States, 92868
      • UC Irvine Medical Center
    • Sacramento, California, United States, 95817
      • University of California, Davis
  • Connecticut
    • New Haven, Connecticut, United States, 06519
      • Yale University
  • District of Columbia
    • Washington, District of Columbia, United States, 20057
      • Georgetown University
  • Florida
    • Gainesville, Florida, United States, 32610
      • University of Florida
    • Miami, Florida, United States, 33136
      • University of Miami - Sylvester Comprehensive Cancer Center
    • Orlando, Florida, United States, 32803
      • Adventist Health System/Sunbelt, Inc.
    • Tampa, Florida, United States, 33606
      • Tampa General Hospital
  • Georgia
    • Augusta, Georgia, United States, 30909
      • Augusta Oncology Associates - Wheeler Road
  • Illinois
    • Chicago, Illinois, United States, 60637
      • University of Chicago
    • Decatur, Illinois, United States, 62526
      • Cancer Care Center of Decatur
  • Kentucky
    • Lexington, Kentucky, United States, 40536
      • University of Kentucky Chandler Medical Center (UKCMC)
  • Michigan
    • Ann Arbor, Michigan, United States, 48109
      • University of Michigan
    • Detroit, Michigan, United States, 48202
      • Henry Ford Hospital
    • Detroit, Michigan, United States, 48201
      • Barbara Ann Karmanos Cancer Center
    • Grand Rapids, Michigan, United States, 49546
      • START Midwest -Cancer & Hematology Center of Western Michigan
  • Minnesota
    • Minneapolis, Minnesota, United States, 55455
      • Regents of the University of Minnesota
  • New York
    • New York, New York, United States, 10029
      • Mount Sinai
    • New York, New York, United States, 10021
      • Weill Cornell
    • New York, New York, United States, 10461
      • Montefiore Medical Center Prime
  • North Carolina
    • Huntersville, North Carolina, United States, 28708
      • Carolina BioOncology
  • Ohio
    • Canton, Ohio, United States, 44718
      • Gabrail Cancer Center
    • Cincinnati, Ohio, United States, 45229
      • UC Health, LLC
    • Cleveland, Ohio, United States, 44106
      • Case Comprehensive Cancer Center
  • Oklahoma
    • Oklahoma City, Oklahoma, United States, 73104
      • University of Oklahoma Health Sciences Center
  • Oregon
    • Portland, Oregon, United States, 97213
      • Providence Portland Cancer Center
  • Pennsylvania
    • Philadelphia, Pennsylvania, United States, 19111
      • Fox Chase Cancer Center
  • South Carolina
    • Greenville, South Carolina, United States, 29605
      • Prisma Health
  • Texas
    • Dallas, Texas, United States, 75230
      • Mary Crowley Cancer Research
    • Houston, Texas, United States, 77030
      • MD Anderson
    • Houston, Texas, United States, 77024
      • Oncology Consultants, P.A.
    • Lubbock, Texas, United States, 79410
      • Joe Arrington Cancer Research & Treatment Center
    • San Antonio, Texas, United States, 78229
      • START Texas Accelerated Research Therapeutics
  • Utah
    • West Valley City, Utah, United States, 84119
      • START Mountain Region
  • Washington
    • Seattle, Washington, United States, 98331
      • Seattle Cancer Care Alliance
  • Wisconsin
    • Madison, Wisconsin, United States, 53792
      • The Board of Regents of the University of Wisconsin
    • Milwaukee, Wisconsin, United States, 53226
      • Medical College of Wisconsin

Participation Criteria

Eligibility Criteria

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

Description

Inclusion Criteria:

1. Able and willing to participate and comply with all study requirements and provide signed and dated informed consent prior to initiation of any study procedures;

2. Histologically or cytologically confirmed advanced/metastatic extracranial solid tumor malignancy:

   1. Stages 1 and 2: Subjects must have received, have been intolerant to, have been ineligible for, or have declined all treatment known to confer clinical benefit with the exception of subjects enrolled in combination cohorts with a PD-1i, where a PD-1i is approved by the local regulatory agencies;
   2. Stage 3: This stage may enroll subjects with 3L/4L PD-(L)1-naïve, platinum-resistant ovarian cancer;

   3. Stage 4: This stage may enroll subjects with the following cancers:

      • 2L/3L ccRCC. Subjects must have progressed on or after treatment with an anti-PD-(L)1 agent in their most recent prior line of therapy;
      • 2L-4L TNBC. Subjects must have progressed on or after treatment with a prior anti-PD-(L)1 therapy;
      • 1L, PD-(L)1-naïve, PD-L1+; combined positive score (CPS) ≥1% HNSCC;
      • 2L/3L platinum-experienced HNSCC. Subjects must have progressed on or after treatment with an anti-PD-(L)1-agent in their most recent prior line of therapy;
      • 3L/4L, PD-(L)1-naïve, platinum-resistant ovarian cancer;
      • 2L/3L NSCLC. Subjects must have progressed on or after treatment with platinum-based chemotherapy and an anti-PD-(L)1-containing therapy. The anti-PD-(L)1 agent must have been a part of the most recent prior line of therapy. Subjects with EGFR mutations and ALK rearrangements will be excluded. Subjects with other targetable genomic aberrations for which FDA approved therapies exist must have received appropriate FDA-approved targeted therapy;
      • 2L/3L cSCC. Subjects must have progressed on or after treatment with an anti-PD-(L)1 agent in their most recent prior line of therapy;
      • 2L-4L PD-(L)1-naïve undifferentiated pleomorphic sarcoma (UPS) and liposarcoma (LPS);
      • 2L/3L biliary tract cancer (BTC), including intra- and extra-hepatic biliary duct cancer and cancer of the gallbladder. Subjects must have progressed on or after gemcitabine/cisplatin (Gem/Cis) in the metastatic setting and must have PD-(L)1 inhibitor resistance. Subjects with FGFR and IDH1 mutations must have progressed on or after targeted therapies for these mutations;
3. Measurable disease, according to the RECIST version 1.1, that has objectively progressed since (or on) previous treatment as assessed by the Investigator;
4. ≥18 years of age;
5. Eastern Cooperative Oncology Group (ECOG) performance status 0 or 1;
6. Predicted life expectancy of ≥3 months;
7. Have specified laboratory values (obtained ≤28 days prior to planned Cycle 1, Day 1 [C1D1]) in accordance with the study protocol;
8. For women of childbearing potential (WOCBP): negative serum pregnancy test during the Screening period and a negative urine pregnancy test up to 24 hours in advance of C1D1;
9. WOCBP and males whose partners are WOCBP must agree to use a highly effective method of birth control throughout their participation and for 5 months following the last study drug administration.

Exclusion Criteria:

1. Concurrent anticancer treatment, either FDA approved or investigational, for the cancer being evaluated in this study or for prior malignancies. A past history of other malignancies is allowed as long as the subject is not receiving treatment other than hormonal therapy and, in the judgment of the Investigator, is unlikely to have a recurrence. Of note, concurrent malignancies that do not require treatment and are clinically stable are allowed;
2. Prior infusion of JTX-8064, LILRB2, or ILT4-directed therapy;

3. The therapies listed below within the specified timeframe or ongoing toxicity attributed to prior therapy that was >Grade 1 according to the NCI CTCAE, version 5.0. Exceptions: >Grade 1 toxicities that, in the opinion of the Investigator, should not exclude the subject (e.g., alopecia, Grade 2 neuropathy, hypo- or hyperthyroidism, or other endocrinopathies that are well controlled with hormone replacement) and are approved by the Medical Monitor:

   1. Major surgery (excluding minor procedures, for example, placement of vascular access, gastrointestinal/biliary stent, biopsy) <4 weeks prior to planned C1D1;
   2. Immunotherapy or biologic therapy <28 days prior to planned C1D1 or 5 half-lives, whichever is shorter;
   3. Chemotherapy <21 days prior to planned C1D1, or <42 days for mitomycin or nitrosoureas or 5 half-lives, whichever is shorter;
   4. Targeted small molecule therapy <14 days or 5 half-lives, whichever is shorter, prior to planned C1D1;
   5. Hormonal or other adjunctive therapy for cancers other than the cancer under evaluation in this study that started <14 days prior to planned C1D1 are not permitted; however, antiestrogen therapy, bisphosphonates, somatostatin analogues, leuprolide, and denosumab are permitted if started ≥14 days prior to C1D1. Other hormonal treatments and/or treatment for stable cancers (other than the cancer being treated on-study) may also be permitted 1) if these therapies would not be expected to have any positive or negative effect on the cancer being treated and 2) if discussed with and approved by the Medical Monitor;
   6. Radiation therapy <21 days prior to planned C1D1. Exception: Limited (e.g., pain palliation) radiation therapy is allowed prior to and during study drug administration as long as there are no acute toxicities, any AE due to prior radiation therapy has recovered to <Grade 2, and the radiation is not administered to a target lesion;
   7. Any prior organ transplantation, including allogeneic or autologous stem cell transplantation;
4. History of intolerance, hypersensitivity, or treatment discontinuation due to Grade 3 or greater irAEs (related to prior immunotherapy);
5. Diagnosis of immunodeficiency, either primary or acquired, or treatment with immunosuppressive levels of systemic corticosteroids (equivalent to ≥10 mg prednisone per day) or any other form of immunosuppressive therapy within 7 days prior to planned C1D1. Exception: Inhaled, intra-articular, topical, or systemic corticosteroids (systemic only at doses intended for adrenal replacement) and doses of immunosuppressive agents used prophylactically for contrast allergies are permitted in the absence of active autoimmune disease;
6. Known severe intolerance or life-threatening hypersensitivity reactions to humanized mAbs or IV immunoglobulin preparations; any history of anaphylaxis; known allergy to any of the study medications, their analogues, or excipients (sodium acetate, sucrose, sodium chloride and polysorbate 80) in the various formulations of any agent;
7. Symptomatic or uncontrolled brain metastases, leptomeningeal disease, or spinal cord compression not definitively treated with surgery or radiation (brain metastases that are stable and asymptomatic after prior treatment will be allowed);
8. Active and clinically relevant bacterial, fungal, or viral infection, including known hepatitis A, B, or C, or HIV (testing not required);
9. Women who are pregnant or breastfeeding or who plan to become pregnant/breastfeed while on study; men who plan to father children during the study;
10. History of pneumonitis requiring treatment with corticosteroids, interstitial lung disease, or severe (≥Grade 3) radiation pneumonitis (excluding localized radiation pneumonitis);
11. History in the last 3 months of acute diverticulitis, intra-abdominal abscess, or gastrointestinal obstruction, unless approved by Medical Monitor;
12. Symptomatic cardiac or cerebrovascular disease that is unresponsive to surgical or medical management;
13. Medical or social condition that, in the opinion of the Investigator, might place the subject at increased risk, adversely affect compliance, or confound safety or other clinical study data interpretation;
14. Active disease requiring systemic immunosuppressive therapy;
15. Live vaccines ≤30 days of C1D1;
16. Deep vein thrombosis, pulmonary embolism (including asymptomatic pulmonary embolism identified on imaging), or other thromboembolic event within the 6 months preceding C1D1 for JTX-8064 monotherapy cohorts 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

12

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Experimental: Stage 1, Dose Escalation: JTX-8064 monotherapy dose escalation; Dose Escalation, Stage 1: JTX-8064 Monotherapy. Cohorts will enroll subjects with histologically or cytologically confirmed advanced/metastatic extracranial solid tumor malignancies.	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4
Experimental: Stage 2, Dose Escalation: JTX-8064 in combination with pimivalimab; Dose Escalation, Stage 2: JTX-8064 in combination with pimivalimab. Cohorts will enroll subjects with histologically or cytologically confirmed advanced/metastatic extracranial solid tumor malignancies.	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4; Drug: pimivalimab; Specified dose on specified days; Other Names: Anti-PD-1; JTX-4014
Experimental: Stage 3 Expansion: JTX-8064 monotherapy (Ovarian); Cohort will enroll subjects with advanced/metastatic PD-1/PD-L1 (PD-(L)1)-naïve, platinum-resistant ovarian cancer.	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4
Experimental: Stage 4, Expansion: JTX-8064 in combination with pimivalimab (ccRCC); JTX-8064 in combination with pimivalimab. Cohort will enroll subjects with advanced/metastatic PD-(L)1i-experienced clear cell renal cell carcinoma (ccRCC).	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4; Drug: pimivalimab; Specified dose on specified days; Other Names: Anti-PD-1; JTX-4014
Experimental: Stage 4, Expansion: JTX-8064 in combination with pimivalimab (TNBC); JTX-8064 in combination with pimivalimab. Cohort will enroll subjects with advanced/metastatic PD-(L)1i-experienced triple negative breast cancer (TNBC).	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4; Drug: pimivalimab; Specified dose on specified days; Other Names: Anti-PD-1; JTX-4014
Experimental: Stage 4, Expansion: JTX-8064 in combination with pimivalimab (HNSCC); JTX-8064 in combination with pimivalimab. Cohort will enroll subjects with advanced/metastatic PD-(L)1-naïve, PD-L1+ head and neck squamous cell carcinoma (HNSCC).	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4; Drug: pimivalimab; Specified dose on specified days; Other Names: Anti-PD-1; JTX-4014
Experimental: Stage 4, Expansion: JTX-8064 in combination with pimivalimab (Ovarian); JTX-8064 in combination with pimivalimab. Cohort will enroll subjects with advanced/metastatic PD-(L)1-naïve, platinum-resistant ovarian cancer.	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4; Drug: pimivalimab; Specified dose on specified days; Other Names: Anti-PD-1; JTX-4014
Experimental: Stage 4, Expansion: JTX-8064 in combination with pimivalimab (NSCLC); JTX-8064 in combination with pimivalimab. Cohort will enroll subjects with advanced/metastatic PD-(L)1-experienced non-small cell lung cancer (NSCLC).	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4; Drug: pimivalimab; Specified dose on specified days; Other Names: Anti-PD-1; JTX-4014
Experimental: Stage 4, Expansion: JTX-8064 in combination with pimivalimab (cSCC); JTX-8064 in combination with pimivalimab. Cohort will enroll subjects with advanced/metastatic PD-(L)1-experienced cutaneous squamous cell carcinoma (cSCC).	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4; Drug: pimivalimab; Specified dose on specified days; Other Names: Anti-PD-1; JTX-4014
Experimental: Stage 4, Expansion: JTX-8064 in combination with pimivalimab (UPS & LPS); JTX-8064 in combination with pimivalimab. Cohort will enroll subjects with advanced/metastatic PD-(L)1-naïve undifferentiated pleomorphic sarcoma (UPS) and liposarcoma (LPS).	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4; Drug: pimivalimab; Specified dose on specified days; Other Names: Anti-PD-1; JTX-4014
Experimental: Stage 4, Expansion: JTX-8064 in combination with pimivalimab (PD-(L)1i-experienced HNSCC); JTX-8064 in combination with pimivalimab. Cohort will enroll subjects with PD-(L)1i-experienced HNSCC.	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4; Drug: pimivalimab; Specified dose on specified days; Other Names: Anti-PD-1; JTX-4014
Experimental: Stage 4, Expansion: JTX-8064 in combination with pimivalimab (BTC); JTX-8064 in combination with pimivalimab. Cohort will enroll subjects with biliary tract cancer (BTC), including intra-and extra-hepatic biliary duct cancer and cancer of the gallbladder. All subjects must have progressed on or after gemcitabine/cisplatin (Gem/Cis) in the metastatic setting, must have PD-(L)1i resistance.	Drug: JTX-8064; Specified dose on specified days; Other Names: Anti-LILRB2; Anti-ILT4; Drug: pimivalimab; Specified dose on specified days; Other Names: Anti-PD-1; JTX-4014

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
Incidence and severity of DLTs, treatment-emergent adverse events (TEAEs), serious TEAEs, and discontinuation due to adverse events (AEs) evaluated using National Cancer Institute (NCI) Common Technology Criteria for Adverse Events (CTCAE) version 5.0	up to 24 months
Determination of a RP2D for JTX-8064 monotherapy and in combination with a PD-1i	up to 24 months

Secondary Outcome Measures

Outcome Measure	Time Frame
Cmax for PD-1i in combination with JTX-8064	Cycles 1 through 12 (each cycle is 21 days)
Tmax for PD-1i in combination with JTX-8064	Cycles 1 through 12 (each cycle is 21 days)
Cmin for PD-1i in combination with JTX-8064	Cycles 1 through 12 (each cycle is 21 days)
For Stages 3 and 4: Preliminary efficacy endpoints: Percentage of subjects with tumor reduction at any time	up to 36 months
Cmax (the maximum observed concentration) for JTX-8064 monotherapy and in combination with a PD-1i	Cycles 1 through 12 (each cycle is 21 days)
Tmax (time of maximum observed concentration) for JTX-8064 monotherapy and in combination with a PD-1i	Cycles 1 through 12 (each cycle is 21 days)
Cmin for JTX-8064 monotherapy and in combination with a PD-1i	Cycles 1 through 12 (each cycle is 21 days)
AUClast (area under the concentration-time curve from time 0 to the last measurable concentration) for JTX-8064 monotherapy and in combination with a PD-1i	Cycles 1 and 3 (each cycle is 21 days)
Incidence of anti-drug antibodies (ADAs) to JTX-8064 and, as appropriate, to PD-1i	Baseline through Cycle 12 (each cycle is 21 days)
Incidence of neutralizing antibodies (Nabs) to JTX-8064 and, as appropriate, to PD-1i	Baseline through Cycle 12 (each cycle is 21 days)
For Stages 1 and 2: Receptor occupancy for LILRB2 on monocytes in whole blood	Baseline through Cycle 6 (each cycle is 21 days)
For Stages 3 and 4: Preliminary efficacy endpoints: Objective response rate (ORR; the proportion of subjects who have had a partial response [PR] or complete response [CR]) as per Response Evaluation Criteria in Solid Tumors (RECIST) version 1.1	up to 36 months
For Stages 3 and 4: Preliminary efficacy endpoints: Disease control rate (DCR; the proportion of subjects who have a PR, CR, or stable disease [SD]), as per RECIST version 1.1	up to 36 months
For Stages 3 and 4: Preliminary efficacy endpoints: Progression-free survival (PFS; the interval from start of treatment to the earlier of first documentation of disease progression or death from any cause)	up to 36 months
For Stages 3 and 4: Preliminary efficacy endpoints: Overall survival (OS; the interval from start of treatment to death of any cause)	up to 36 months
For Stages 3 and 4: Preliminary efficacy endpoints: Duration of response (DOR; the time from documentation of tumor progression or death due to any cause, whichever comes first)	up to 36 months

Collaborators and Investigators

• Sponsor: Jounce Therapeutics, Inc.
• Investigators: Study Director: Stew Kroll, Jounce Therapeutics, Inc.

Study record dates

Study Major Dates

• Study Start (Actual): January 12, 2021
• Primary Completion (Actual): November 28, 2023
• Study Completion (Actual): November 28, 2023

Study Registration Dates

• First Submitted: December 4, 2020
• First Submitted That Met QC Criteria: December 9, 2020
• First Posted (Actual): December 17, 2020

Study Record Updates

• Last Update Posted (Actual): April 9, 2024
• Last Update Submitted That Met QC Criteria: April 5, 2024
• Last Verified: April 1, 2024

More Information

Terms related to this study

• Keywords: Immunotherapy; Dose escalation; PD-1; Antineoplastic Agents; Combination Therapy; Immuno-oncology; Monotherapy; Immunological; JTX-8064; LILRB2; JTX-4014; Solid tumor Malignancies; INNATE; ILT4
• Other Study ID Numbers: JTX-8064-101

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No