Adenocarcinoma lung cancer prognosis does not tell a very pretty picture. It does depend on the stage at which the cancer is diagnosed and the overall health of the patient. But, in general the prognosis is poor, especially if the cancer has spread to the lymph nodes of the mediastinum or areas outside the chest wall.
This type of cancer can only be cured with surgery or radiation therapy, but only if this can completely remove the tumor. However most of the time, this cancer is diagnosed at a stage when therapy is of no use. Only 17% of patients diagnosed with adenocarcinoma survive for more than 5 years.