The pathology (from 3 biopsies) is inconclusive. It has properties of an upper GI cancer but is located in the lung only. The lymph node where it has spread can be either a lung or Gi cancer. The cancer is officially designated a 'cancer of unknown primary', the doctors do not know where the cancer started. They can't give us a definitive diagnosis of ANY type of cancer at this point. But given that in over a year no primary source can be defined and the tumor is in the lung, they are leaning toward a lung cancer. Because they can't identify a source or type of cancer we're monitoring only. Using chemo would require using multiple types of chemo and not knowing which one or if any would work. Radiation is a possibility but we're monitoring a while longer before we move forward with that. Surgery is not an option they say, due to my husband's health and also because removing the tumor wouldn't necessarily mean they had done anything to reserve or contain the cancer and surgery is more risky to his lungs (as is radiation to some extent). There is a type of cancer that I researched and the doctors are considering called enteric pulmonary adenocarcinoma, which is a lung cancer that presents as a cancer of the GI tract. Currently my husband has no symptoms of cancer specifically so there are also no clues there. My husband had a heart condition that we found answers for during one of his biopies. That condition has been successfully resolved with a heart surgery. When he was first diagnosed with cancer he seemed quite ill because of the heart condition. Since that's been resolved, he is much healthier and the doctors may have more options for us, as he can better tolerate treatments.....but we still don't know what we're treating and the cancer has been getting progressively smaller and less active with each 3 month PET scan.