Utility of CD15, CD30 & CD45 in the immunohistochemical diagnosis of Hodgkin's disease by antigen retrieval method

The utility of staining Reed-Sternberg (RS) cells with CD30, CD15 and CD45 as a diagnostic aid in Hodgkin's disease (HD) and the value of microwave ci trate antigen retrieval (AR) method in improving the results of immunohisto chemical (IHC) studies were evaluated. Histological and immunohistological studies were carried out on 21 patients with HD seen from January 1987 to D ecember 1996 in the Pathology Department of the Cumhuriyet University, Scho ol of Medicine. Avidin biotin peroxidase complex (ABC) was used in IHC stud y as a method for detection of RS cells. Monoclonal antibodies CD30, CD15 a nd CD45 were applied on formalin fixed paraffin embedded tissue sections. I n order to enhance the immunoreactivity, microwave citrate AR method and pr oteolytic pretreatment were used. The reactivity of RS cells and staining p atterns were determined. In 14 (70%) of the 20 patients, RS cells stained p ositively with CD30, in 16 (80%) CD15 staining was positive and only 1 (5%) was positively stained with CD45. A combination of cytoplasmic with cell s urface staining was common with CD30, while paranuclear deposit with cell s urface and cytoplasmic staining was common with CD15. In conclusion, to fac ilitate the detection of RS cells in formalin fixed paraffin embedded tissu es, the application of a panel of markers appears to be necessary. Also AR method seems to be helpful in obtaining optimal results on formalin fixed p araffin embedded tissue.