The purpose of this study is to evaluate the safety and early clinical activity of M9140 in Chinese participants with locally advanced or metastatic colorectal cancer (CRC).

Inclusion Criteria:

• Participants with documented histopathological diagnosis of locally advanced or metastatic CRC, who were intolerant/refractory to or progressed after standard systemic therapies for the advanced/metastatic stage that included and are restricted to a fluoropyrimidine, irinotecan, a platinum agent (e.g. oxaliplatin), an anti-EGFR agent (if clinically indicated, i.e. RAS/BRAF wt), and an anti-VEGF agent. Participants may have received previous treatment with trifluridine/tipiracil and/or regorafenib or fruquintinib, if locally indicated and available. Participants with a known MSI-H status must have received treatment with an immune checkpoint inhibitor (if locally indicated and available) unless contraindicated
• Eastern Cooperative Oncology Group Performance Status (ECOG PS) below or equal to 1
• Participants with adequate hematologic, hepatic and renal function as defined in protocol
• Other protocol defined inclusion criteria could apply

Exclusion Criteria:

• Participant has a history of malignancy within 3 years before the date of enrollment (exceptions are squamous and basal cell carcinomas of the skin and carcinoma in situ of the cervix, benign prostate neoplasm/hypertropia, or malignancy that in the opinion of the Investigator, with concurrence with the Sponsor's Medical Monitor, is considered cured with minimal risk of recurrence within 3 years)
• Participants with known brain metastases, except those meeting the following criteria: Brain metastases that have been treated locally and are clinically stable for at least 4 weeks prior to the start of treatment; No ongoing neurological symptoms that are related to the brain localization of the disease (sequelae that are a consequence of the treatment of the brain metastases are acceptable)
• Participants with diarrhea (liquid stool) or ileus Grade > 1
• Cerebrovascular accident/stroke (< 6 months prior to enrollment)
• Other protocol defined exclusion criteria could apply

We are committed to enhancing public health through responsible sharing of clinical trial data. Following approval of a new product or a new indication for an approved product in both the US and the European Union, the study sponsor and/or its affiliated companies will share study protocols, anonymized patient data and study level data, and redacted clinical study reports with qualified scientific and medical researchers, upon request, as necessary for conducting legitimate research. Further information on how to request data can be found on our website http://bit.ly/IPD21