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Adult Solid TumorPhase 1NCT05147272

Study of RP-6306 With Gemcitabine in Advanced Solid Tumors

A Phase 1 study testing RP-6306 (oral PKMYT1 inhibitor) in people with Adult Solid Tumor, run by Debiopharm International SA at 11 sites in 3 countries.

Terminated

Stopped early. The study ended before it was planned to and will not resume.

Official record
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Trial summary

The primary purpose of this study is to assess the safety and tolerability of RP-6306 in combination gemcitabine, in patients with eligible advanced solid tumors, determine the maximum tolerated dose (MTD) of RP-6306 in combination with gemcitabine, identify a recommended phase 2 dose (RP2D) and preferred schedule… Read more about this study

Who is it for?
Ages 18 years and older
Conditions the study is for
Adult Solid Tumor
What is being tested?
RP-6306 (oral PKMYT1 inhibitor)
Could I receive a placebo?
No, everyone receives an active treatment
How many people
67 participants
Where
11 sitesin 3 countries
Study dates
16 Dec 2021to 28 Aug 2024
Phase
Phase 1
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Male or female and ≥18 years-of-age at the time of informed consent.
  • ECOG Performance status 0 or 1.
  • Locally advanced or metastatic resistant or refractory solid tumors.
  • Submission of available tumor tissue at screening or willingness to have a biopsy performed if safe and feasible.
  • Measurable disease as per RECIST v1.1.
  • Ability to swallow and retain oral medications.
Show all 10Show fewer
  • Acceptable hematologic and organ function at screening.
  • Negative pregnancy test (serum) for women of childbearing potential (WOCBP) at Screening.
  • Resolution of all toxicities of prior therapy or surgical procedures.
  • Life expectancy ≥12 weeks after the start of the treatment

Who cannot join

  • Chemotherapy or small molecule antineoplastic agent given within 21 days or <5 half- lives, whichever is shorter, prior to first dose of study drug.
  • History or current condition, therapy, or laboratory abnormality that might confound the study results or interfere with the patient's participation for the full duration of the study treatment.
  • Patients who are pregnant or breastfeeding.
  • Known sensitivity to any of the ingredients of RP-6306 or gemcitabine.
  • Life-threatening illness, medical condition, active uncontrolled infection, or organ system dysfunction or other reasons which, in the investigator's opinion, could compromise the participating patient's safety.
  • Major surgery within 4 weeks prior to first dose of RP-6306 and gemcitabine.
Show all 10Show fewer
  • Uncontrolled, symptomatic brain metastases.
  • Uncontrolled hypertension.
  • Moderate or severe hepatic impairment
  • Psychological, familial, sociological, or geographical conditions that do not permit compliance with the protocol and/or follow-up procedures outlined in the protocol.

Trial locations and contacts

11 sites in 3 countries.

11 sites in 3 countries

United States9 sites
  • # 1023, START Midwest

    Grand Rapids, Michigan, 49546

  • # 1017, Mayo Clinic

    Jacksonville, Florida, 32224

  • # 1019, UCLA, Westwood Cancer Center

    Los Angeles, California, 90095

  • # 1008, Columbia University

    New York, New York, 10032

  • # 1004, Memorial Sloan Kettering Cancer Institute

    New York, New York, 10065

  • # 1010, University of Pennsylvania

    Philadelphia, Pennsylvania, 19104

  • # 1018, Mayo Clinic

    Phoenix, Arizona, 85054

  • # 1016, Mayo Clinic

    Rochester, Minnesota, 55902

  • # 1022, Moffitt Cancer Center

    Tampa, Florida, 33612

Other trials in United States

Canada1 site
  • # 2001, Princess Margaret Cancer Centre

    Toronto, Ontario, M5G 2C1

Other trials in Canada

United Kingdom1 site
  • # 3003, Sarah Cannon Research Institute

    London

Other trials in United Kingdom

About this study

Official title: Phase 1 Study of the PKMYT1 Inhibitor RP-6306 in Combination With Gemcitabine for the Treatment of Advanced Solid Tumors (MAGNETIC Study)

The primary purpose of this study is to assess the safety and tolerability of RP-6306 in combination gemcitabine, in patients with eligible advanced solid tumors, determine the maximum tolerated dose (MTD) of RP-6306 in combination with gemcitabine, identify a recommended phase 2 dose (RP2D) and preferred schedule, examine preliminary pharmacokinetics (PK) and assess anti-tumor activity.

Read the detailed description

Phase 1, multi-center, open-label, dose-escalation study to:

  • Evaluate the safety profile and MTD of RP-6306 with gemcitabine to establish the RP2D and schedule
  • Characterize the PK and pharmacodynamics of RP-6306 with gemcitabine
  • Assess preliminary anti-tumor activity associated with RP-6306 with gemcitabine

The Sponsor of the study has changed from 'Repare Therapeutics' to 'Debiopharm International SA' in the United States.

Being tested
RP-6306 (oral PKMYT1 inhibitor)

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • RP-6306 (oral PKMYT1 inhibitor)Drug

    Also called Gemcitabine (IV)

    RP-6306 in combination with gemcitabine

Study groups in NCT05147272
Study groupRoleWhat they receive
Phase 1 Dose EscalationExperimentalMultiple dose levels of RP-6306 and gemcitabine
Receives: Drug: RP-6306 (oral PKMYT1 inhibitor)

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Number of Patients With of Treatment-related Adverse Event Data Per CTCAE v5.0 Criteria to Determine Safety and Tolerability of RP-6306 in Combination With Gemcitabine.

    Incidence of grade 3 and above Treatment Related Emergent Adverse Events (TRAEs)

    Measured: Start of treatment to 30 days post last dose. up to 1.5 years

  2. Number of Dose Limiting Toxicities, as Defined Per Protocol, That Occur During the First Cycle (21 Days) of Treatment at Each Dose Level

    Evaluation of dose-limiting toxicities (DLTs) at or below a frequency of 25%

    Measured: During 21 days from the initiation of the study treatment (C1D1)

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted7 Dec 2021
  2. Study start16 Dec 2021
  3. Primary completion28 Aug 2024
  4. Study completion28 Aug 2024

Why it stopped: Sponsor decided to terminate the study

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 1
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Sequential
Model description
Dose Escalation and Expansion
Masking
None (open label)
Enrolment
67 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05147272
Sponsor's protocol ID
RP-6306-02
Status last verified
Nov 2025
First submitted
10 Nov 2021
Last updated
5 Dec 2025
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing RP-6306 (oral PKMYT1 inhibitor) in people with Adult Solid Tumor, run by Debiopharm International SA at 11 sites in 3 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 10 inclusion and 10 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: stopped early, as of the sponsor's last update on 5 Dec 2025. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 11 sites in United States, Canada, United Kingdom. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 1 studies test a treatment in a small group of people for the first time or in a new way, mainly to check safety and find the right dose.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 16 Oct 2025). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of Patients With of Treatment-related Adverse Event Data Per CTCAE v5.0 Criteria to Determine Safety and Tolerability of RP-6306 in Combination With Gemcitabine. (time frame: Start of treatment to 30 days post last dose. up to 1.5 years). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.

Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 5 Dec 2025.

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