Let me at the outset tell you that individual variations occur in the prediction of the life span in cancer diseases. This is dependent on the;
2) Other concomitant diseases
3) Spread, stage and grade (there are various grades even in the tonsil cancer called as poorly differentiated, moderately differentiated and well differentiated; poorly differentiated has the worst prognosis).
The PET scan will tell about the spread of the cancer. The usual life span of advanced tonsil cancer in his age group with the concomitant illness would be around 2 years. Having said that; again to re-emphasize, there can be wide variations as some individuals may respond well to the radiation therapy (and chemotherapy if used) while some may not at all.
In an individual exact spread and histopathological grading would be the biggest factors to predict the life span.
Please feel free for your follow up questions.
I would be happy to assist you further, if you need any more information.
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