You could require radiation
These cancers are generally locally disabling. That means they tend to recur in the same area or spread in local (near about the first disease in the mouth) and in the regional area (in the neck). They spread to other areas like lungs very late or never. Hence, local therapy becomes very important.
You have to understand that a local cure would more or less mean total cure. Hence, you probably would require chemoradiation for better control. The exact duration, drugs used and radiation planning would be done by your local treating oncologist
in consultation with the surgeon and the scan reports. The pathology report would also determine the therapy. It would be difficult to comment on the exact survival of any patient. However, the very fact that marginal mandibulectomy (part of jaw bone) has been done and only one lymph
node has shown tumor
is an indicator of possible better outcome.