A Study to Learn More About How Safe BAY 3771249 is and How Well it Works in People With Advanced or Metastatic Colorectal Cancer That Has a KRAS G12D Mutation

NCT07535112 | Not Yet Recruiting Phase 1 FDA Drug

• 1 other identifier: 23111-1
• Study Type: interventional
• Target: 130
• Locations: 10 countries
• Sites: 18

Brief Summary

Researchers are looking for a better way to treat people who have advanced or metastatic colorectal cancer (CRC) with a specific mutation, the G12D mutation, in a protein called KRAS. Colorectal cancer (CRC) is a common type of cancer that affects the large bowel (colon) or the rectum (the section at the end of the bowel). When CRC spreads to other parts of the body, it is called advanced or metastatic CRC. Some people with CRC have the G12D mutation in the KRAS protein. This mutation is linked to a poorer outlook and fewer treatment options. Currently, there are no approved treatments that specifically target this mutation. KRAS is a protein that helps control how cells grow and divide. When it is mutated, it can cause cells to grow uncontrollably, leading to cancer. The study drug, BAY 3771249, is designed to block the activity of KRAS with G12D mutation, which may help slow or stop the growth of cancer cells. BAY 3771249 can be given alone or together with another drug called cetuximab. The main purpose of this study is to learn how safe BAY 3771249 is, how well people tolerate it, how the body processes the drug, and whether it can help shrink or control tumors in people with advanced or metastatic CRC that has the KRAS G12D mutation. The study will also look at how BAY 3771249 works when given alone or with cetuximab, especially in people who have already tried other treatments for their cancer. Researchers will measure, among others: The number and seriousness of health problems (adverse events) after receiving BAY 3771249. The number of participants who experience a dose-limiting side effect (DLT) at each dose level. The number of participants whose tumors shrink or disappear (overall response rate, ORR) as measured by standard criteria. How much of the drug is in the blood over time (AUC) and the highest amount in the blood (Cmax). Some participants will receive BAY 3771249 alone (monotherapy), and others will receive BAY 3771249 with cetuximab (combination therapy). The study will start with lower doses and gradually increase to find the highest safe dose (dosage escalation). After the safe dose is found, more participants may join the study to receive it (dosage expansion). In some parts of the study, participants may be randomly assigned to different groups or doses. The study is open-label, meaning both participants and doctors know which treatment is being given. An adverse event is any medical problem that a participant has during a study. Doctors keep track of all adverse events, even if they do not think it is related to the study treatment. The study doctors and their team will contact participants to learn about their health until they complete the study. If a participant benefits from the treatment, it might be possible to continue receiving BAY 3771249 after the end of the study. The findings from this study may help develop a new treatment option for people with advanced or metastatic CRC with a KRAS G12D mutation.

Conditions

Advanced/Metastatic Colorectal Adenocarcinoma

Outcome Measures

Primary Outcomes (10)

• Number of participants with Treatment-emergent adverse events (TEAEs)

  Applicable in Dosage escalation and expansion

  Up to approximately 2 years.

• Severity of TEAEs

  Applicable in Dosage escalation and expansion

  Up to approximately 2 years.

• Change from baseline in vital signs: Pulse rate

  Applicable in Dosage escalation and expansion

  Up to approximately 2 years

• Change from baseline in vital signs: Oxygen saturation

  Applicable in Dosage escalation and expansion

  Up to approximately 2 years

• Change from baseline in vital signs: Respiratory rate

  Applicable in Dosage escalation and expansion

  Up to approximately 2 years

• Change from baseline in vital signs: Blood pressure

  Applicable in Dosage escalation and expansion

  Up to approximately 2 years

• Change from baseline in vital signs: Body temperature

  Applicable in Dosage escalation and expansion

  Up to approximately 2 years

• Change from baseline in laboratory test results

  Hematology, serum chemistry, urinalysys and coagulation tests. Applicable in Dosage escalation and expansion

  Up to approximately 2 years

• Number of participants experiencing a dose-limiting toxicity (DLT) at each dosage

  Applicable in Dose escalation part

  Up to approximately 3 weeks

• Objective response rate (ORR) as determined by the Investigator according to RECIST v1.1

  Applicable in Dosage escalation and expansion

  Up to approximately 2 years

Secondary Outcomes (2)

• Pharmacokinetics (PK) parameters such as area under the concentration vs time curve (AUC)

  Up to approximately 2 years

• PK parameters such as maximum observed drug concentration (Cmax)

  Up to approximately 2 years

Study Arms (2)

Dosage escalation

EXPERIMENTAL

In the dosage escalation part, different dose levels of BAY 3771249 administered as monotherapy and in combination with cetuximab are planned.

Drug: BAY 3771249; Drug: Cetuximab

Dosage expansion

EXPERIMENTAL

In the dosage expansion part, participants will receive BAY 3771249 either as monotherapy or in combination with cetuximab until disease progression as defined by RECIST v1.1, the occurrence of unacceptable toxicity, or the fulfillment of any other withdrawal criteria.

Drug: BAY 3771249; Drug: Cetuximab

Interventions

BAY 3771249 DRUG

Oral

Dosage escalation; Dosage expansion

Cetuximab DRUG

Intravenous (IV) infusion

Dosage escalation; Dosage expansion

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• KRAS G12D mutated solid tumor
• Participant must be ≥18 years old or the legal age of consent in the jurisdiction in which the study is taking place when signing the screening ICF
• At least one measurable lesion as per RECIST v1.1. outside the CNS
• Eastern Cooperative Oncology Group performance status (ECOG PS) of ≤1
• Male or Female: Contraceptive use by participant or participant's partners should be consistent with local regulations regarding the methods of contraception for those participating in clinical studies.
• Life expectancy of at least 3 months in the opinion of the Investigator
• Histologically/pathologically documented diagnosis of advanced/metastatic adenocarcinoma of the colon and rectum.
• Adequate hematologic and end-organ function

You may not qualify if:

• Leptomeningeal disease or carcinomatous meningitis
• Uncontrolled and/or active/symptomatic brain metastases.
• Significant traumatic injury or major surgical procedure within 4 weeks of first dose of study intervention
• Known hypersensitivity to any component of study intervention
• Previous (within 3 years) or concurrent cancer that is distinct in primary site or histology from the cancer being evaluated in the respective substudy.
• Active infection requiring systemic anti-infective therapy within 14 days of first dose of study intervention
• Known HIV infection
• Active Hepatitis B virus (HBV) infection
• Active Hepatitis C virus (HCV) infection;
• Significant cardiac disorder
• History of risk factors for torsade de pointes (TdP) (e.g., heart failure, family history of long QT syndrome)
• Participants with inadequately managed diabetes as assessed by the Investigator
• Toxicities from prior anticancer therapy, defined as not having resolved to Grade ≤1 or as specified in the respective substudy protocol as per NCI CTCAE v.6.0 with the following exceptions: Alopecia of any grade, Peripheral neuropathy Grade ≤2, Autoimmune endocrine disorders Grade ≤2 managed with stable endocrine replacement therapy
• History of (non-infectious) pneumonitis/interstitial lung disease (ILD), drug-induced ILD, radiation pneumonitis (unless it has resolved without sequelae without use of steroids), or any evidence of clinically-active pneumonitis/ILD
• History of the following eye disorders: keratitis, ulcerative keratitis

Sponsors & Collaborators

• Bayer: lead

Study Sites (18)

City of Hope - Duarte Cancer Center

Duarte, California, 91010, United States

Location

UC San Diego Health - Moores Cancer Center

San Diego, California, 92037, United States

Location

Sarah Cannon Research Institute at HCA HealthONE Presbyterian St. Luke's

Denver, Colorado, 80218, United States

Location

Icahn School of Medicine at Mount Sinai - Oncology

New York, New York, 10029, United States

Location

NEXT Dallas - Oncology Department

Irving, Texas, 75039, United States

Location

START | San Antonio

San Antonio, Texas, 78229, United States

Location

Calvary Mater Hospital Newcastle - Oncology

Waratah, New South Wales, 2298, Australia

Location

Ghent University Hospital | Drug Research Unit Department

Ghent, 9000, Belgium

Location

Rigshospitalet - Kræftbehandling

Copenhagen, Capital Region, 2100, Denmark

Location

Odense University Hospital - Oncology Department

Odense, Region Syddanmark, 5000, Denmark

Location

HUS-Yhtymä, Helsingin yliopistollinen sairaala (HUS) - Syöpäkeskus

Helsinki, Uusimaa, 00029, Finland

Location

Fondazione Policlinico Universitario Agostino Gemelli IRCCS - UOC Fase I

Roma, 00128, Italy

Location

Nederlands Kanker Instituut

Amsterdam, 1066 CX, Netherlands

Location

National University Hospital Medical Centre

Singapore, 119074, Singapore

Location

National Cancer Center Singapore - Oncology Department

Singapore, 168583, Singapore

Location

Hospital Universitari Vall D Hebron | Oncologia

Barcelona, 08035, Spain

Location

Hospital Universitario Hm Sanchinarro | Oncologia

Madrid, 28050, Spain

Location

Karolinska Universitetssjukhuset - Fas I-enheten Solna CKC

Stockholm, Stockholm County, 171 76, Sweden

Location

MeSH Terms

Interventions

Cetuximab

Intervention Hierarchy (Ancestors)

Antibodies, Monoclonal, Humanized; Antibodies, Monoclonal; Antibodies; Immunoglobulins; Immunoproteins; Blood Proteins; Proteins; Amino Acids, Peptides, and Proteins; Serum Globulins; Globulins

Central Study Contacts

Bayer Clinical Trials Contact

CONTACT

(+)1-888-84 22937; clinical-trials-contact@bayer.com

Study Design

• Study Type: interventional
• Phase: phase 1
• Allocation: NA
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: SEQUENTIAL
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: April 1, 2026
• First Posted: April 16, 2026
• Study Start: April 15, 2026
• Primary Completion (Estimated): July 27, 2029
• Study Completion (Estimated): July 9, 2030
• Last Updated: April 16, 2026

Record last verified: 2026-04

Data Sharing

• IPD Sharing: Will not share

Locations

NL (1); SG (2); AU (1); BE (1); US (6); ES (2); FI (1); IT (1); SE (1); DK (2)