HSP90B1 and neoplasm: To investigate this aspect further, we found that cells of tumor infiltrates were for the most part represented by B lymphocytes, as evidenced by staining with anti-CD20+ Abs (Figure 1B), and that in a double immune-staining for both Grp94 and CD20+, the cells positive for Grp94 were mostly plasma cells, easily identified for their typical morphological aspect (Figure 1B, arrows in right panels of higher enlargement).