Regarding the impact of clinicopathological characteristics on the expression of the investigated markers (CD20, CD20-positive B-cell aggregates in the tumor compartment and in the tumor infiltration zone, CD138, IgM, Pax5, and Mib), there was a significant association between high CD20-expression and an age ≥65 years (p = 0.025). The gene discussed is PAX5; the disease is neoplasm.