A friend of mine was just diagnosed with rectal cancer, liver cancer and lung cancer. what is his life expectancy?

6% survival at 5 yrs: Your friend is stage iv. Overall survival rate is 6% at five years from time of diagnosis. His actual life expectency is related to many factors and should be discussed with his treating physician.

Grave Situation: Of course we cannot even begin to guess at this tragic situation. I would defer to the physicians providing him care. But, as you have surmised it may not be long for him.