That is not a very wise thing to say. Be careful what you wish for, especially when it involves death.
That "future" may be next year, next month, or even next week; which means that if your "hope" is granted, you cannot live any longer.
Not to mention that the cause of your death may be cancer...
Not really. But based on the increasing of the factors that cause cancers (e.g. pollutions, toxic chemicals, unhealthy foods...), I think I can say that I'm not very surprised...