A Study of VS-6766 and Cetuximab in Patients With Advanced Colorectal Cancer

Inclusion Criteria: * Must be able to show documentation of disease: Participants must have metastatic colorectal adenocarcinoma with kirsten rat sarcoma viral oncogene homolog (KRAS) mutations, detected by any Clinical Laboratory Improvement Amendments-certified method (tumor or ct-DNA), for which curable treatment modalities are not an option. * Participants with the following KRAS mutations can be included in the study. These eligible KRAS mutations will be confirmed by the Study Chair, Dr. Shergill. Please contact Dr. Shergill for all other mutations that you feel may benefit from this treatment. * Must have measurable disease per Response Evaluation Criteria in Solid Tumors (RECIST 1.1). * Must have had progression of disease on 5-FU or capecitabine, oxaliplatin, irinotecan and bevacizumab therapy or any other approved anti-VEGF therapy or must have a scientifically justifiable reason for not having had these therapies prior to trial. If participant has high levels of MicroSatellite Instability (MSI-H), they must have had recommended immunotherapy agent(s) i.e anti- programmed death ligand 1 (L)1 with or without anti-CTLA4 agents. * No prior Lonsurf or regorafenib treatment is allowed. * Must have not had any treatment with prior MEK (mitogen-activated protein kinase kinase) inhibitor, anti-EGFR (antineoplastic epidermal growth factor receptor), KRAS, SOS1 ( Son of sevenless 1) and SHP2 (Src homology-2 domain-containing protein tyrosine phosphatase-2) inhibitor therapy.…