Medullary carcinomas often stain positive for calcitonin, which is a highly sensitive marker. Also, CEA, LMW cytokeratin and neuroendocrine peptides may be found. This tumor was as previously noted cytokeratin, CEA, calcitonin positive strongly supporting the diagnosis. The prognosis of medullary carcinoma varies considerably. An age of less than forty is a good prognostic indicator.
Pathological stage is the most important factor.