There are four stages of oral cancer. In stage 1 oral cancer, the tumor is at or under 2 centimeters in size, and the cancer has not spread to the lymph nodes. In stage 2 oral cancer, the tumor is at or under 4 centimeters in size, and the cancer has not spread to the lymph nodes. In stage 3 oral cancer, the tumor could be larger than 4 centimeters but not spread to the lymph nodes. Alternatively, the tumor has spread to one lymph node but not any other parts of the body. In stage 4 oral cancer, the tumor can be any size, and the cancer has spread to other parts of the body. Oral cancer screenings can catch "stage 0" cancer when cells have yet to become cancerous. Cancers caught in the earliest stages have the highest five-year survival rates.