What affects the prognosis?

Depends. It all depends on the diagnoses and disease that is being prognosed. In the end, it is based on the most common course of a particular disease, including duration, complications, life expectancy, etc. It is really an educated guess.

Related Questions

What factors affect prognosis with colon cancer?

Pathology stage. The cell type, dna type (k-ras mutation, etc.), stage of the cancer depending on how deep it may invade, whether the cancer spread to lymph nodes or other organs; these are some of the evaluations performed after the cancer is surgically removed. Overall health and age have some affect, but not as much. Read more...
Staging & treat soon. Staging addresses prognosis--based on tumor depth of local invasion through colon & spread of tumor (metastasis) to sites distant from primary mass. Histology (microscopic typing), genetic factors (polyposis syndromes), age of onset, co-morbidities, completeness of removal, & environmental factors (for example Aspirin increase survivability) all play roles. Early detection & removal is key here. Read more...