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Thanks for your question.
Basically the prognosis for diabetes mellitus is strongly influenced by the degree of control of the disease. With better monitoring and treatment the prognosis of diabetes is better and will prevent complications from occurring and from further progression of the disease. Hence please consult your doctor and take regular treatment with monitoring of blood glucose levels.
Regarding oral cancer as your doctors have already informed you that at this stage it has an unfavorable prognosis. However no one can tell exactly how long you have and this may be less than 5 years based on studies done.