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Thanks for contacting with your health concern.
1. As you are a diagnosed case with prognosis explained, remain under the constant and regular supervision of your
Oncologist.
2. As PET shows lesion in liver/lungs/S4 thus it is possible that metastasis [spread of cancer, stage 4] is there, thus curative care is not possible only
palliative care is possible [which is essentially advised by the Oncologist]
PS. since the cancer is advanced you might need
colostomy [to get rid of body waste] for the rest of your life.
3. elevated CEA levels are more common in smokers and Inflammatory conditions and can also be elevated in other carcinomas including lung, breast, gastrointestinal and gynecological cancers
PS. the sensitivity of CEA is low for early colorectal patients [1 month in your history] and increases with increasing stage of the disease, so make sure to have regular follow up visits, for periodic physical examination and blood tests.