NCT07535112 · Bayer
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
What this study is about
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).
View original scientific description
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.
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- 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
Exclusion criteria
- 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
Where
- Phoenix, Arizona
- Duarte, California
- San Diego, California
- Denver, Colorado
- New York, New York
- Irving, Texas
- San Antonio, Texas
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jul 6, 2026 · Source of record for eligibility and locations