MKI67 and non-Hodgkin lymphoma: These were: (1) PE-NHL patients who had comorbidities (p = 0.02), (2) those cases with dysphagia as presenting symptoms (p = 0.04), (3) tumors with the highest proliferative activity (Ki67 > 80%) (p = 0.04), and (4) those diagnosed at advanced stages of the disease (p = 0.004).