In October 2008, my father was diagnosed with cancer. He had metastases in the liver, the lungs and one rib. He underwent numerous examinations and tests, including colonoscopy, gastroscopy, liver biopsy, X-rays and scan. The source of the cancer was not identified. The doctors refused to give him chemotherapy for two reasons: first, they did not know what type of cancer he had and second, they said that since his liver was very damaged, chemotherapy might harm him more than help him (they said that it might even kill him). He is now in hospital for palliative treatment. Is this all that modern medicine can do? Is it still possible to do something for him? Is it common that the source of the cancer is not known? Please help! He is 66 years old!