Study to Assess Adverse Events and How Intravenously (IV) Infused Telisotuzumab Adizutecan (ABBV-400) Moves Through the Body of Adult Participants With Unresectable Locally Advanced/Metastatic Colorectal Cancer

Inclusion criteria

• Eastern Cooperative Oncology Group (ECOG) Performance Status (PS) of 0 or 1.
• Has histologically or cytologically confirmed unresectable advanced/metastatic colorectal cancer (mCRC).
• Has measurable disease per response evaluation criteria in solid tumors (RECIST) v1.1.
• Does not harbor the BRAF V600E mutation and is not deficient mismatch repair (dMMR)+/microsatellite instability (MSI)-High.
• Stage 2 only:

• Archival or recently obtained tumor material must be submitted for assessment of c-Met protein levels by an AbbVie designated IHC laboratory during the pre-screening period. Tumor material from the primary tumor site and/or metastatic sites are allowed. If archival tissue is negative for c-Met protein expression with 3+ intensity, >= 10% tumor cells, recently obtained biopsy material may be submitted for reassessment of c-Met protein expression with 3+ intensity, >= 10% tumor cells.

Exclusion criteria

• History (within 6 months) of congestive heart failure (defined as New York Heart Association, Class 2 or higher), ischemic cardiovascular event, cardiac arrhythmia requiring pharmacological or surgical intervention, pericardial effusion, or pericarditis.
• Prior systemic regimen containing c-Met protein targeting antibody (e.g., amivantamab-vmjw, ABT-700) or define: antibody-drug conjugate (ADC). Tyrosine kinase inhibitors (TKIs) of Met protein are allowed.
• History of Interstitial lung disease (ILD)/pneumonitis that required treatment with systemic steroids, or any evidence of active ILD/pneumonitis on screening chest computed tomography (CT) scan.
• History of idiopathic pulmonary fibrosis, organizing pneumonia (e.g., bronchiolitis obliterans), drug-induced pneumonitis, or idiopathic pneumonitis.
• History of clinically significant, intercurrent lung-specific illnesses including, but not limited to:

• Underlying pulmonary disorder (i.e., pulmonary emboli within 3 months of the study enrollment, severe asthma, severe chronic obstructive pulmonary disease [COPD], restrictive lung disease, pleural effusion, dependence on supplemental oxygen, etc.)
• Any autoimmune, connective tissue or inflammatory disorders with documented or suspicious pulmonary involvement at screening (i.e., rheumatoid arthritis, Sjogren's, sarcoidosis, etc.) and prior pneumonectomy.
• No resolution of any acute clinically significant treatment-related toxicity from prior therapy to Grade <= 1 prior to study entry, except for neutropenia (Grade <= 2), peripheral neuropathy (Grade <= 2), and alopecia (any grade).
• Untreated brain or meningeal metastases (i.e., participants with history of metastases are eligible provided they do not require ongoing steroid treatment for cerebral edema and have shown clinical and radiographic stability for at least 14 days after definitive therapy).
• History of other malignancies within 5 years prior to screening, except for malignancies with a negligible risk of metastasis or death (e.g., 5-year Overall Survival [OS] rate > 90%).