In-vitro sensitivity of Hodgkin's disease to hydrogen peroxide toxicity. Correlation with peroxidase activity

Hodgkin's disease of nodular sclerosis and mixed cellularity subtypes contains numerous eosinophils and substantial amounts of extracellular eosinophil peroxidase (EPO). To determine if the extracellular EPO retains cytotoxic activity, the authors analyzed cells from 13 cases of Hodgkin's disease and ten cases of benign lymphoid hyperplasia for their in vitro sensitivity to killing by a low concentration of hydrogen peroxide. Cells from cases of benign lymphoid hyperplasia (0.5% +/- 1% killing) and lymphocyte predominant Hodgkin's disease (4.5% +/- 6% killing) were significantly (P less than 0.05) less sensitive to killing by hydrogen peroxide than cells from nodular sclerosis Hodgkin's disease (26% +/- 13% killing) and mixed cellularity Hodgkin's disease (52% +/- 9% killing). The authors concluded that cells from Hodgkin's disease of nodular sclerosis and mixed cellularity subtypes have an increased sensitivity to killing by an otherwise nonlethal concentration of hydrogen peroxide.