CT-95 in Advanced Cancers Associated With Mesothelin Expression

June 10, 2026 updated by: Context Therapeutics Inc.

Phase 1a/1b Study of CT-95 in Advanced Cancers Associated With Mesothelin Expression

This is a Phase 1a/1b, first-in-human (FIH), open-label, multi-center dose escalation and expansion study of the safety, pharmacokinetics (PK), pharmacodynamics, and antitumor activity of single-agent CT-95 in subjects with advanced (recurrent, unresectable, or metastatic) cancers associated with MSLN expression.

Study Overview

Status

Recruiting

Conditions

Intervention / Treatment

Detailed Description

Phase 1a Dose Escalation: Participants with ovarian epithelial tumors, primary peritoneal or fallopian tube cancer (PROC), epithelioid mesothelioma, lung adenocarcinoma, pancreatic adenocarcinoma, colorectal cancer, cholangiocarcinoma, and gastric/GEJ adenocarcinomas will be enrolled in one of approximately 9 dose escalation cohorts to assess the safety and tolerability of CT-95, as well as determine the maximum tolerated dose (MTD) or other recommended dose(s) for expansion (RDE[s]) for further dose expansion cohorts.

Participants will receive CT-95 as a single agent administered once weekly (QW) intravenously (IV) over a 4-week cycle.

Phase 1b Dose Expansion: The RDE(s) of CT-95 determined in Phase 1a will be evaluated in 2-4 indication-specific expansion cohorts of up to 20 subjects each (i.e. up to 80 participants total). Different indications, dose levels, and/or schedules may be explored. The expansion doses and/or dosing schedules for Phase 1b will be determined by Sponsor in conjunction with SRC based upon all available safety, PK, PD, biomarker, and preliminary efficacy data from Phase 1a.

Study Type

Interventional

Enrollment (Estimated)

70

Phase

  • Phase 1

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • United States
    • Colorado
    • Illinois
      • Chicago, Illinois, United States, 60637
    • Michigan
      • Grand Rapids, Michigan, United States, 49546
    • New Jersey
      • Hackensack, New Jersey, United States, 07601
    • Pennsylvania
      • Philadelphia, Pennsylvania, United States, 19104
      • Philadelphia, Pennsylvania, United States, 19107
        • Recruiting
        • Context Investigational Site
        • Contact:
    • Tennessee
      • Nashville, Tennessee, United States, 37203
        • Recruiting
        • Context Investigational Site
        • Contact:
          • Sarah Cannon Research Institute
          • Phone Number: 844-482-4812
    • Texas

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • ECOG 0 or 1
  • Subjects with evaluable disease per RECIST 1.1 or mRECIST
  • Subjects with adequate organ function.
  • Subjects with advanced cancers associated with mesothelin expression

Exclusion Criteria:

  • Uncontrolled significant active infection or any medical or other condition that in opinion of the investigator would preclude the subject's participation in the study.
  • Prior treatment with MSLN-targeted CD3 or chimeric antigen receptor T cell (CAR-T) therapy
  • Concurrent participation in another investigational clinical trial.
  • Evidence of leptomeningeal disease

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: CT-95

Phase 1a: Dose Escalation - each dose cohort will assess toxicity 28 days following the first dose of CT95 anticipate a total of 8 dose cohorts.

Phase 1b: Dose Expansion - approximately 80 participants will be evaluated in 2-4 indication-specific expansion cohorts.
Drug: CT-95
MSLN bispecific antibody to be administered according to the dose and schedule of the assigned cohort until documentation of disease progression (or confirmed disease progression), unacceptable toxicity, or participant/physician decision.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Determine the MTD or RD of CT-95 [Safety and Tolerability]
Time Frame: From date of first dose of CT-95 until 28 days following the first dose.
The frequency of dose-limiting toxicities (DLTs) will be analyzed along with safety and tolerability measures to determine the MTD or RD of CT-95.
From date of first dose of CT-95 until 28 days following the first dose.
Incidence of Treatment-Emergent Adverse Events [Safety and Tolerability]
Time Frame: From date of first dose of CT-95 for approximately 6 months or until treatment discontinuation, whichever comes first.
The frequency and severity of adverse events, serious adverse events, and adverse events of special interest will be analyzed.
From date of first dose of CT-95 for approximately 6 months or until treatment discontinuation, whichever comes first.

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Evaluate Response Rates [Anti-tumor Activity]
Time Frame: At 8-week intervals from the time of the first dose of CT-95 for approximately 6 months or until treatment discontinuation, whichever comes first
Overall response rates will be calculated using RECIST 1.1 (and mRECIST for patients with mesothelioma) for CT-95.
At 8-week intervals from the time of the first dose of CT-95 for approximately 6 months or until treatment discontinuation, whichever comes first
Evaluate Progression-free Survival [Anti-tumor Activity]
Time Frame: At 8-week intervals from the time of the first dose of CT-95 for approximately 6 months or until treatment discontinuation, whichever comes first.
PFS will be summarized using RECIST 1.1 (and mRECIST for patients with mesothelioma) for CT-95.
At 8-week intervals from the time of the first dose of CT-95 for approximately 6 months or until treatment discontinuation, whichever comes first.
Evaluate Overall Survival [Survival]
Time Frame: From the time of the first dose of CT-95 until approximately two years post-first dose.
Overall survival will be summarized for CT-95.
From the time of the first dose of CT-95 until approximately two years post-first dose.
Evaluate the Maximum Serum Concentration (Cmax) [Pharmacokinetics]
Time Frame: From date of first dose of CT-95 for 5 months or until treatment discontinuation, whichever comes first.
Serum concentrations of CT-95 analyzed as a function of time relative to dosing will be calculated.
From date of first dose of CT-95 for 5 months or until treatment discontinuation, whichever comes first.
Evaluate the Area Under the Curve (AUC) [Pharmacokinetics]
Time Frame: From date of first dose of CT-95 for 5 months or treatment discontinuation, whichever comes first.
The AUC of CT-95 analyzed as a function of time relative to dosing will be calculated.
From date of first dose of CT-95 for 5 months or treatment discontinuation, whichever comes first.
Evaluate Anti-Drug Antibodies [Immunogenicity]
Time Frame: From date of first dose of CT-95 for 5 months or until treatment discontinuation, whichever comes first.
Incidence and titer of ADAs will be evaluated.
From date of first dose of CT-95 for 5 months or until treatment discontinuation, whichever comes first.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Context Therapeutics Inc.

Investigators

  • Study Director: Karen Chagin, MD, Context Therapeutics Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

March 31, 2025

Primary Completion (Estimated)

December 1, 2026

Study Completion (Estimated)

December 1, 2028

Study Registration Dates

First Submitted

December 18, 2024

First Submitted That Met QC Criteria

December 24, 2024

First Posted (Actual)

January 1, 2025

Study Record Updates

Last Update Posted (Actual)

June 12, 2026

Last Update Submitted That Met QC Criteria

June 10, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • CNTX-CT95-101

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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