If you are enrolled in the Phase I portion, the dose of dasatinib you will receive will depend on when you joined the study. Three (3) to 6 participants will be entered at each dose level. Each new group of participants will receive a higher dose, until the highest tolerable dose is found. Once the highest tolerable dose is found, 12 participants will be enrolled at that dose level. Your doctor will tell you what dose level you will be receiving and how this dose compares to the doses other participants have received. The starting dose of cetuximab and FOLFOX will be the same for all participants. The dose of dasatinib will be increased with the next group of 3-6 participants. Every 14 days is considered 1 study "cycle".