My father has blood tests regularly because he had been diagnosed with prostrate cancer about 5 years ago. They treated with radiation. They told him his blood test indicated that he has cancer somewhere. They have done a bone scan or an MRI and they told him they don't know where the cancer is. They know it isn't in the prostrate. Is it possible that they are not running any more tests because he has congestive heart failure? He still lives at home with my Mom and is on many medications, but not on oxygen.They have scheduled no more tests and just sent him home with the diagnosis that he has cancer, but can't tell him where. He would really like to know what type of cancer he has and how progressive it is, as would the rest of us. What should we ask them to do?