Using RT-PCR, we confirmed that among the microvesicular transcripts shared by SW480 and glioblastoma microvesicles [15] but not detected in mast cell microvesicles, RAB13, CXCR4, MYC, and FAS transcripts were present in the SW480-derived microvesicles (Figure 3B). The gene discussed is CXCR4; the disease is glioblastoma.