You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is A patient with history of increased lethargy and significant loss of weight found to have elevated carcinoembryonic antigens (CEA) in laboratory examination. He may have all of the following conditions, EXCEPT: and explain in detail?
Carcinoembryonic antigen (CEA) is a glycoprotein found in the embryonic endodermal epithelium. Elevated CEA levels have been detected in patients with primary colorectal cancer as well as in patients with breast, lung, ovarian, prostate, liver, and pancreatic cancer. Levels of CEA also may be elevated in benign conditions such as diveiculitis, peptic ulcer disease, bronchitis, liver abscess, and alcoholic cirrhosis, especially in smokers and in elderly persons. Ref: Meric-Bernstam F. (2010). Chapter 10. Oncology. In T.R. Billiar, D.L. Dunn (Eds), Schwaz's Principles of Surgery, 9e.