Final answer:
Without specific details regarding the type and stage of the cancer a patient is dealing with, it is not possible to accurately determine their life expectancy. Factors including cancer type, stage, and individual health must be accounted for when considering survival rates.
Step-by-step explanation:
Life expectancy for a patient with cancer varies widely based on the type of cancer, stage at diagnosis, treatment options, and individual health factors. Information provided suggests a latency period of about 2 years for leukemia and 15 years for most other forms of radiation-induced cancer. In cases of skin cancer, such as melanoma, there is only a 17 percent chance of surviving for five years. Additionally, the risk of a radiation-induced cancer death per rem of exposure is about 10 in a million annually. With the average life expectancy globally being 73.4 years and the risk factors mentioned, it is not possible to provide an exact prognosis without more specific information about the type and stage of cancer.