MCAM and dermatomyositis: Estimation of the number of CD146 positive blood vessels (large vessels and capillaries) per muscle fiber showed no significant differences between juvenile DM and childhood controls (control vs JDM: Mean ± SE: 1.0 ± 0.2 vs 1.0 ± 0.3; p = ns); whereas the number of CD146 positive blood vessels per fiber was significantly reduced in adult DM as compared to adult controls (control vs DM: Mean ± SE: 2.2 ± 0.3 vs 1.3 ± 0.2; p < 0.05).