CD40 and myeloid sarcoma: Based on our data, we observed a tendency for higher HERV-W1 ENV expression which was not significant in PBMC of individuals with MS, but no up-regulation of MSRV ENV in LCL, although an increase in HERV-K18 and six other HERV loci occurred upon EBV-immortalization via CD40/BCR-receptor signaling pathway.