Study of RGT-490 in Patients With PIK3CA-Mutated Advanced Solid Tumors

April 16, 2026 updated by: Regor Pharmaceuticals Inc.

A Phase 1/1b Open-Label, Multicenter, First-in-Human Study Evaluating Safety, Tolerability, Pharmacokinetics, and Antitumor Activity of RGT-490 as a Single Agent in Adult Subjects With Locally Advanced or Metastatic PIK3CA-Mutated Solid Tumors Including HR+/HER2- Breast Cancers

This is a phase 1/1b, open-label, multicenter study consisting of sequential parts designed to evaluate the safety, tolerability, and effects pharmacokinetic (PK) profile, and antitumor activity of RGT-490, an investigational oral therapy, in adults with locally advanced or metastatic solid tumors including breast cancer.

Participants enrolled in the study have advanced disease that is not amendable to curative treatment and whose tumors harbor alterations in the PI3KCA gene.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
63

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • 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 Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Contact Backup

Study Locations

  • United States
    • Texas
      • Houston, Texas, United States, 77054
        • Recruiting
        • Next Houston
      • San Antonio, Texas, United States, 78229
        • Recruiting
        • NEXT San Antonio
    • Virginia
      • Fairfax, Virginia, United States, 22031
        • Recruiting
        • NEXT Virginia

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Adults with metastatic or locally advanced, unresectable solid tumors that have progressed on or after at least one available therapy.
  • Presence of one or more documented activating PIK3CA mutation in tumor tissue and/or blood.
  • At least 1 measurable lesion or evaluable disease per RECIST v1.1.
  • An ECOG performance status of 0 or 1.
  • Adequate organ function

Exclusion Criteria:

  • Diabetes mellitus requiring anti-hyperglycemic medication.
  • Prior treatment with PI3Kα inhibitors
  • Symptomatic, untreated, or uncontrolled central nervous system metastases.
  • Receipt of any local or systemic anticancer therapy or investigational anticancer agent within a protocol-defined washout period prior to study treatment.
  • Unresolved clinically significant toxicities from prior anticancer therapy
  • History of a another malignancy within 2 years prior to screening (exception adequately treated cancers).

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: Non-Randomized
  • Interventional Model: Sequential Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Phase 1 Dose Escalation (Advanced Solid Tumors with PIK3CA mutation)
RGT-490 given alone as monotherapy
Drug: RGT-490
Oral tablets
Experimental: Phase 1b Dose Expansion (HR+/HER2- locally advanced or metastatic breast cancer)
RGT-490 given alone as monotherapy
Drug: RGT-490
Oral tablets

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Incidence of dose limiting toxicities (DLTs)
Time Frame: 4 weeks (1 cycle)
Number of subjects who experience at least 1 Dose Limiting Toxicity (DLT)
4 weeks (1 cycle)
Incidence and grade of Adverse Events (AEs) and Serious Adverse Events (SAEs)
Time Frame: Every cycle (4-week cycles) until study discontinuation, approximately 12 months
Incidence and grade of Adverse Events (AEs) and Serious Adverse Events (SAEs) and AEs leading to dose modifications and dose limiting toxicities (DLTs) to determine the maximum tolerated dose (MTD)
Every cycle (4-week cycles) until study discontinuation, approximately 12 months

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Characterize the Cmax (PK) of RGT-490 monotherapy in Dose Escalation
Time Frame: First 3 treatment cycles (each cycle is 28 days)
Maximum observed plasma concentration (Cmax) of RGT-490
First 3 treatment cycles (each cycle is 28 days)
Characterize the Tmax (PK) of RGT-490 monotherapy in Dose Escalation
Time Frame: First 3 treatment cycles (each cycle is 28 days)
Maximum observed plasma concentration (Tmax) of RGT-490
First 3 treatment cycles (each cycle is 28 days)
Characterize the AUC (PK) of RGT-490 monotherapy in Dose Escalation
Time Frame: First 3 treatment cycles (each cycle is 28 days)
Calculated area under the plasma concentration curve (AUC) of RGT-490
First 3 treatment cycles (each cycle is 28 days)
Measure PD effects of RGT-490 monotherapy in Dose Escalation and Phase 1b
Time Frame: First 7 cycles (each cycle is 28 days) and at study discontinuation
Change from baseline in ctDNA levels; Change from baseline in PD markers in paired biopsies
First 7 cycles (each cycle is 28 days) and at study discontinuation
Changes in fasting blood glucose
Time Frame: Approximately every week in Cycle 1 and Cycle 2 (4-week cycle), every 2 weeks in Cycles 3-6 (4-week cycle), and every cycle through end of treatment (4-week cycles), approximately 24 months
Measured by fasting blood glucose
Approximately every week in Cycle 1 and Cycle 2 (4-week cycle), every 2 weeks in Cycles 3-6 (4-week cycle), and every cycle through end of treatment (4-week cycles), approximately 24 months
Changes in longitudinal glucose metabolism (All Phases)
Time Frame: Approximately every cycle (4-week cycles) until study discontinuation, approximately 24 months
Measured by HbA1c
Approximately every cycle (4-week cycles) until study discontinuation, approximately 24 months
Assess preliminary efficacy of RGT-490 monotherapy in dose escalation and Phase 1b
Time Frame: Approximately every 8 weeks until progressive disease, approximately 12 months
Objective response rate (ORR) based on RECIST v1.1
Approximately every 8 weeks until progressive disease, approximately 12 months
Evaluate additional measures of efficacy of RGT-490
Time Frame: Approximately every 8 weeks until progressive disease, approximately 36 months
Duration of response (DoR) according to RECIST v1.1
Approximately every 8 weeks until progressive disease, approximately 36 months
Evaluate additional measures of efficacy of RGT-490
Time Frame: Approximately every 8 weeks until progressive disease, approximately 36 months
Progression free survival (PFS) according to RECIST v1.1
Approximately every 8 weeks until progressive disease, approximately 36 months

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Regor Pharmaceuticals 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 (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
April 1, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
April 1, 2028

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
October 1, 2028

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
March 31, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 6, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
April 13, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
April 21, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
April 16, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
April 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • RGT-490-101

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

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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