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Advanced or Metastatic ER+ HER2- Breast Cancer (mBC)Phase 1NCT06784193

Phase 1 Study of OP-3136 in Advanced or Metastatic Solid Tumors

A Phase 1 study testing OP-3136, Fulvestrant and Palazestrant in people with Advanced or Metastatic ER+ HER2- Breast Cancer (mBC) and Advanced or Metastatic Non-Small Cell Lung Cancer (NSCLC), run by Olema Pharmaceuticals, Inc. at 25 sites in 6 countries.

Recruiting

Looking for participants now. Contact the study team or a site below to ask about taking part.

Sites and contacts
Official record
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Trial summary

This is a first-in-human, open-label, multicenter phase 1 study to evaluate safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and preliminary efficacy of OP-3136, a lysine acetyltransferases 6A and 6B (KAT6A/B) inhibitor, as monotherapy and in combination with other anticancer agents in participants… Read more about this study

Who is it for?
Ages 18 years and older
What is being tested?
OP-3136, Fulvestrant and Palazestrant
Could I receive a placebo?
No, everyone receives an active treatment
How many people
180 participants
Where
25 sitesin 6 countries
Study dates
16 Dec 2024to 30 Aug 2027
Phase
Phase 1
Are there results?
Not yet: the study is under way

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

  • Participants with advanced or metastatic ER+HER2- breast cancer, mCRPC, or NSCLC (Part 1) or advanced or metastatic ER+HER2- BC or mCRPC (Part 2).
  • Part 1A (Dose escalation for OP-3136 monotherapy): Participants must have a tumor that is unresectable or metastatic and for which life prolonging measures do not exist or available therapies are intolerable or no longer effective.
  • Part 1B (Dose escalation for OP-3136 in combination with fulvestrant): Participants with advanced or metastatic ER+ HER2- breast cancer that have progressed on or after at least 1 prior line of treatment that included endocrine therapy and CDK 4/6 inhibitor in advanced or metastatic setting and must have received no more than 2 prior lines of endocrine therapy (one of which must be in combination with CDK4/6 inhibitor) and no more than 1 prior line of chemotherapy or an antibody-drug conjugate in the advanced or metastatic setting.
  • Part 1C (Dose escalation for OP-3136 in combination with palazestrant): Participants with advanced or metastatic ER+ HER2- breast cancer that have progressed on or after at least 1 prior line of treatment that included endocrine therapy and CDK 4/6 inhibitor in advanced or metastatic setting and must have received no more than 2 prior lines of endocrine therapy (one of which must be in combination with CDK4/6 inhibitor) and no more than 1 prior line of chemotherapy or an antibody-drug conjugate in the advanced or metastatic setting.
  • Part 2A (Dose Expansion in ER+ HER2- mBC for OP-3136 monotherapy): Participants must have received up to 3 prior lines of endocrine therapy (one of which must be in combination with CDK4/6 inhibitor) and up to 1 prior line of chemotherapy or an antibody-drug conjugate.
  • Part 2A (Dose Expansion in mCRPC for OP-3136 monotherapy): Participants must have received up to 4 lines of prior systemic therapy for prostate cancer. Prior therapy must include treatment with an androgen receptor pathway inhibitor(s).
  • Part 2B (Dose Expansion in ER+ HER2- mBC for OP-3136 in combination with fulvestrant OR Dose Expansion in ER+ HER2- mBC for OP-3136 in combination with palazestrant): Participants must have progressed on or after at least 1 prior line of treatment that included endocrine therapy and CDK 4/6 inhibitor in advanced or metastatic setting. Participants must have received no more than 2 prior lines of endocrine therapy in the advanced or metastatic setting and no more than 1 prior line of chemotherapy or an antibody-drug conjugate in the advanced or metastatic setting.

Who cannot join

  • Prior therapy with KAT6A/B inhibitor in any treatment setting.
  • Participants with advanced/metastatic, symptomatic, visceral spread, that are at risk of life-threatening complications in the short term.
  • Known active or symptomatic central nervous system (CNS) metastases, carcinomatous meningitis, leptomeningeal disease, or a spinal cord compression that require CNS-specific treatment, or participants who did not demonstrate clinical and radiologic stability during the last 2 months prior to the first dose of study treatment or require or are currently on steroid therapy for CNS metastases.
  • History of cerebral vascular disease, including transient ischemic attack, within 6 months prior to the first dose of study treatment.
  • History of or ongoing impaired cardiac function or clinically significant cardiac disease within 6 months prior to the first dose of study treatment.
  • Note: Additional inclusion/exclusion criteria may apply.

Trial locations and contacts

25 sites in 6 countries. Contact the study team or a site near you to ask about taking part.

There may be multiple sites in this clinical trial Olema Clinical Trial Lead contact

415-651-7206

clinical@olema.com

Olema Medical Study Director contact

25 sites in 6 countries

United States13 sites, 12 recruiting
  • University of Colorado

    Aurora, Colorado, 80045

    Recruiting
  • Massachusetts General Hospital

    Boston, Massachusetts, 02114

    Recruiting
  • Dana-Farber Cancer Institute

    Boston, Massachusetts, 02215

    Recruiting
  • The Ohio State University

    Columbus, Ohio, 43021

    Recruiting
  • Banner MD Anderson Cancer Center

    Gilbert, Arizona, 85234

    Recruiting
  • START - Midwest

    Grand Rapids, Michigan, 49546

    Recruiting
  • SCRI Oncology Partners

    Nashville, Tennessee, 37203

    Recruiting
  • Tennessee Oncology

    Nashville, Tennessee, 37203

    Recruiting
  • University Medical Center - New Orleans

    New Orleans, Louisiana, 70112

    Terminated
  • Memorial Sloan Kettering Cancer Center

    New York, New York, 10065

    Recruiting
  • START - San Antonio

    San Antonio, Texas, 78229

    Recruiting
  • Florida Cancer Specialists

    Sarasota, Florida, 34232

    Recruiting
  • START - Mountain Region

    West Valley City, Utah, 84119

    Recruiting

Other trials in United States

Australia4 sites, 4 recruiting
  • Cancer Research South Australia

    Adelaide, South Australia, 5000

    Recruiting
  • The Kinghorn Cancer Centre

    Darlinghurst, New South Wales, 2010

    Recruiting
  • Liverpool Hospital

    Liverpool, New South Wales, 2170

    Recruiting
  • Macquarie University Clinical Trials Unit

    Macquarie, New South Wales, 2109

    Recruiting

Other trials in Australia

France3 sites, 3 recruiting
  • Hôpital Paris Saint-Joseph

    Paris, Paris, 75014

    Recruiting
  • Institut De Cancerologie De L'ouest

    Saint-Herblain, Loire-Atlantique, 44805

    Recruiting
  • Institut Gustave Roussy

    Villejuif, Val-de-Marne, 94800

    Recruiting

Other trials in France

Spain3 sites, 3 recruiting
  • START - Barcelona

    Barcelona, Barcelona, 08023

    Recruiting
  • Start - Fjd

    Madrid, Madrid, 28040

    Recruiting
  • START Madrid - CIOCC

    Madrid, Madrid, 28050

    Recruiting

Other trials in Spain

Hong Kong1 site, 1 recruiting
  • Queen Mary Hospital

    Hong Kong, Hong Kong

    Recruiting

Other trials in Hong Kong

Ireland1 site, 1 recruiting
  • START Dublin

    Dublin, Dublin, D07 R2WY

    Recruiting

Other trials in Ireland

About this study

Official title: A Phase 1 First-in-Human, Open-Label, Multicenter Study of OP-3136 in Adult Participants With Advanced or Metastatic Solid Tumors

This is a first-in-human, open-label, multicenter phase 1 study to evaluate safety, tolerability, pharmacokinetics (PK), pharmacodynamics (PD), and preliminary efficacy of OP-3136, a lysine acetyltransferases 6A and 6B (KAT6A/B) inhibitor, as monotherapy and in combination with other anticancer agents in participants with advanced solid tumors.

This study consists of 2 parts: a dose escalation part (Part 1) and dose expansion part (Part 2).

Read the detailed description

Part 1A (Dose Escalation for OP-3136 Monotherapy): This part of the study will evaluate the safety, tolerability, and PK in a range of doses of OP-3136, a lysine acetyltransferases 6A and 6B (KAT6A/B) inhibitor, administered orally once daily to participants with ER+ HER2- advanced or metastatic breast cancer (mBC), advanced or metastatic castration resistant prostate cancer (mCRPC), or advanced or metastatic non-small cell lung cancer (mNSCLC), and determine the maximum tolerated dose (MTD) and the recommended dose/regimen for expansion (RDE).

Part 1B (Dose Escalation for OP-3136 in Combination with Fulvestrant): This part of the study will evaluate the safety and PK of OP-3136 administered in combination with fulvestrant in participants with ER+ HER2- mBC, and determine MTD and RDE for this combination.

Part 1C (Dose Escalation for OP-3136 in Combination with Palazestrant): This part of the study will evaluate the safety and PK of OP-3136 administered in combination with palazestrant in participants with ER+ HER2- mBC, and determine MTD and RDE for this combination.

Part 2A (Dose Expansion for OP-3136 Monotherapy): This part will evaluate two expansion cohorts at the monotherapy RDE from part 1 in participants with ER+ HER2- mBC and participants with mCRPC.

Part 2B (Dose Expansion for OP-3136 in Combination with Fulvestrant OR Palazestrant): This part will evaluate the RDEs for OP-3136 in combination with fulvestrant from Part 1B OR the RDEs of OP-3136 in combination with palazestrant in an expansion cohort in participants with ER+ HER2- mBC.

Being tested
OP-3136, Fulvestrant, Palazestrant
Keywords
KAT6 Inhibitor, Histone Acetyltransferase (HAT) Inhibitor, Epigenetic
Medical subject headings
Carcinoma, Non-Small-Cell Lung, Breast Neoplasms

What participants receive

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

  • OP-3136Drug

    Selective inhibitor of HAT enzymes KAT6A and KAT6B

  • FulvestrantDrug

    Selective estrogen receptor degrader (SERD)

  • PalazestrantDrug

    Complete estrogen receptor antagonist (CERAN)

Study groups in NCT06784193
Study groupRoleWhat they receive
Part 1A Dose Escalation monotherapyExperimentalNot described
Receives: Drug: OP-3136
Part 1B Dose Escalation in combination with fulvestrantExperimentalNot described
Receives: Drug: OP-3136; Drug: Fulvestrant
Part 1C Dose Escalation in combination with palazestrantExperimentalNot described
Receives: Drug: OP-3136; Drug: Palazestrant
Part 2A Dose Expansion monotherapy - mBCExperimentalNot described
Receives: Drug: OP-3136
Part 2A Dose Expansion monotherapy - mCRPCExperimentalNot described
Receives: Drug: OP-3136
Part 2B Dose Expansion in combination with fulvestrant OR palazestrant-mBC @ RDE 1ExperimentalNot described
Receives: Drug: OP-3136; Drug: Fulvestrant; Drug: Palazestrant
Part 2B Dose Expansion in combination with fulvestrant OR palazestrant-mBC @ RDE 2ExperimentalNot described
Receives: Drug: OP-3136; Drug: Fulvestrant; Drug: Palazestrant

What is being measured

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

  1. Number of participants with dose-limiting toxicities in the Dose Escalation Arms

    Measured: Up to 28 days

  2. Incidence of adverse events and laboratory abnormalities

    Measured: Up to 26 months

Secondary outcomes (6)
  1. Maximum observed concentration (Cmax)

    Measured: Up to 26 months

  2. Time to maximum concentration (Tmax)

    Measured: Up to 26 months

  3. Area under the curve from time zero to 24 hours (AUC0-24)

    Measured: Up to 26 months

  4. Overall Response Rate (ORR)

    Measured: Up to 26 months

  5. Duration of Response (DOR)

    Measured: Up to 26 months

  6. Clinical Benefit Rate (CBR)

    Measured: Up to 26 months

Timeline

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

  1. First posted20 Jan 2025
  2. Study start16 Dec 2024
  3. Primary completion30 May 2027 (estimated)
  4. Study completion30 Aug 2027 (estimated)

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
Randomised
Intervention model
Sequential
Masking
None (open label)
Enrolment
180 participants (estimated)
IDs, dates and publications
ClinicalTrials.gov ID
NCT06784193
Sponsor's protocol ID
OP-3136-101
Status last verified
Oct 2026
First submitted
14 Jan 2025
Last updated
5 Oct 2026
Results posted
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
Undecided

Questions about this trial

What is this clinical trial studying?

A Phase 1 study testing OP-3136, Fulvestrant and Palazestrant in people with Advanced or Metastatic ER+ HER2- Breast Cancer (mBC) and Advanced or Metastatic Non-Small Cell Lung Cancer (NSCLC), run by Olema Pharmaceuticals, Inc. at 25 sites in 6 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 7 inclusion and 6 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: looking for participants now, as of the sponsor's last update on 5 Oct 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 25 sites in United States, Australia, France, Spain, Hong Kong and 1 more country. 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?

This study is still under way. Results are not available in the source record yet.

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

Contact There may be multiple sites in this clinical trial Olema Clinical Trial Lead (415-651-7206, clinical@olema.com), or a site near the patient. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Number of participants with dose-limiting toxicities in the Dose Escalation Arms (time frame: Up to 28 days). 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 Oct 2026.

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