FSHD muscles with progression at the 2-year MRI follow-up showed a significantly high number of BDCA1+ myeloid dendritic cells (Fig. 6a), CD8+ T lymphocytes (Fig. 6b) and CD20+ B lymphocytes (Fig. 6c), but not of CD4+ T lymphocytes (Fig. 6d), compared to FSHD muscles without progression. This evidence concerns the gene CD4 and facioscapulohumeral muscular dystrophy.