Histochemistry

Results for our immunohistochemistry are summarized in Table 5. In our eleven tumor cases, we found conflicting results from what has been published in previous literature. Although the literature describes PCTs as generally positive for GFAP staining8, we found that three of the four cases tested for GFAP staining had all reacted negatively. Moreover, EMA staining showed mixed results in GCTs and PCTs, whereas all three SCOs cases reacted positively, which has been shown in the literature9. When testing S100 reactivity, we found that all of the tumors tested (8/8) stained positively, which was shown to be positive in PCTs9,10, but showed both positive and negative results in SCOs9,10. All eleven of the masses, including the three SCO cases, had positive staining for TTF-1.