RAC2 and neoplasm: H&E staining of the tumor sections showed that irradiation triggered more cellular atrophy in the tumors derived from OCM-RAC2 cells compared with that from OCM-NC cells, while IHC analysis showed that the RAC2 as well as Bax expression in tumors derived from OCM-RAC2 cells was much higher than that from OCM-NC tumors (Figure 6(e)).