It would be unlikely that an oral cancer would spread to the spine or related areas. This disease has been well studied, as have been its routes of metastasis. The most likely areas of metastasis, are the aerodigestive tract, lungs, esophagus, larynx, even stomach. With advanced cases that have node involvement, you have to consider that the lymphatic system can carry the malignant cells to more distant sites. With a lung involvement that was positive, it can go anywhere, given that the malignant cells now have direct access to the circulatory system. Involvement in the osseous tissues is usually limited to the mandible and maxilla and the other associated major bones of the face. Take a look at a couple of the permanent threads titled